diff --git a/qa/rpc-tests/p2p-segwit.py b/qa/rpc-tests/p2p-segwit.py
index b30d41af9..fa2c5d1f0 100755
--- a/qa/rpc-tests/p2p-segwit.py
+++ b/qa/rpc-tests/p2p-segwit.py
@@ -1065,12 +1065,12 @@ class SegWitTest(BitcoinTestFramework):
             assert_equal(wit_block.serialize(False), non_wit_block.serialize())
             assert_equal(wit_block.serialize(True), block.serialize(True))
 
-            # Test size, vsize, cost
+            # Test size, vsize, weight
             rpc_details = self.nodes[0].getblock(block.hash, True)
             assert_equal(rpc_details["size"], len(block.serialize(True)))
             assert_equal(rpc_details["strippedsize"], len(block.serialize(False)))
-            cost = 3*len(block.serialize(False)) + len(block.serialize(True))
-            assert_equal(rpc_details["cost"], cost)
+            weight = 3*len(block.serialize(False)) + len(block.serialize(True))
+            assert_equal(rpc_details["weight"], weight)
 
             # Upgraded node should not ask for blocks from unupgraded
             block4 = self.build_next_block(nVersion=4)
diff --git a/src/consensus/consensus.h b/src/consensus/consensus.h
index 81f40593b..690856586 100644
--- a/src/consensus/consensus.h
+++ b/src/consensus/consensus.h
@@ -10,8 +10,8 @@
 
 /** The maximum allowed size for a serialized block, in bytes (only for buffer size limits) */
 static const unsigned int MAX_BLOCK_SERIALIZED_SIZE = 4000000;
-/** The maximum allowed cost for a block, see BIP 141 (network rule) */
-static const unsigned int MAX_BLOCK_COST = 4000000;
+/** The maximum allowed weight for a block, see BIP 141 (network rule) */
+static const unsigned int MAX_BLOCK_WEIGHT = 4000000;
 /** The maximum allowed size for a block excluding witness data, in bytes (network rule) */
 static const unsigned int MAX_BLOCK_BASE_SIZE = 1000000;
 /** The maximum allowed number of signature check operations in a block (network rule) */
diff --git a/src/init.cpp b/src/init.cpp
index 509bc45f5..312dfe169 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -452,7 +452,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-mempoolreplacement", strprintf(_("Enable transaction replacement in the memory pool (default: %u)"), DEFAULT_ENABLE_REPLACEMENT));
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
-    strUsage += HelpMessageOpt("-blockmaxcost=<n>", strprintf(_("Set maximum BIP141 block cost (default: %d)"), DEFAULT_BLOCK_MAX_COST));
+    strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));
     strUsage += HelpMessageOpt("-blockmaxsize=<n>", strprintf(_("Set maximum block size in bytes (default: %d)"), DEFAULT_BLOCK_MAX_SIZE));
     strUsage += HelpMessageOpt("-blockprioritysize=<n>", strprintf(_("Set maximum size of high-priority/low-fee transactions in bytes (default: %d)"), DEFAULT_BLOCK_PRIORITY_SIZE));
     if (showDebug)
diff --git a/src/main.cpp b/src/main.cpp
index 73fbe53af..fe19895f5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -694,8 +694,8 @@ bool AddOrphanTx(const CTransaction& tx, NodeId peer) EXCLUSIVE_LOCKS_REQUIRED(c
     // have been mined or received.
     // 100 orphans, each of which is at most 99,999 bytes big is
     // at most 10 megabytes of orphans and somewhat more byprev index (in the worst case):
-    unsigned int sz = GetTransactionCost(tx);
-    if (sz >= MAX_STANDARD_TX_COST)
+    unsigned int sz = GetTransactionWeight(tx);
+    if (sz >= MAX_STANDARD_TX_WEIGHT)
     {
         LogPrint("mempool", "ignoring large orphan tx (size: %u, hash: %s)\n", sz, hash.ToString());
         return false;
@@ -3596,13 +3596,13 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIn
     }
 
     // After the coinbase witness nonce and commitment are verified,
-    // we can check if the block cost passes (before we've checked the
-    // coinbase witness, it would be possible for the cost to be too
+    // we can check if the block weight passes (before we've checked the
+    // coinbase witness, it would be possible for the weight to be too
     // large by filling up the coinbase witness, which doesn't change
     // the block hash, so we couldn't mark the block as permanently
     // failed).
-    if (GetBlockCost(block) > MAX_BLOCK_COST) {
-        return state.DoS(100, error("ContextualCheckBlock(): cost limit failed"), REJECT_INVALID, "bad-blk-cost");
+    if (GetBlockWeight(block) > MAX_BLOCK_WEIGHT) {
+        return state.DoS(100, error("ContextualCheckBlock(): weight limit failed"), REJECT_INVALID, "bad-blk-weight");
     }
 
     return true;
diff --git a/src/main.h b/src/main.h
index 65ae2488f..27121890f 100644
--- a/src/main.h
+++ b/src/main.h
@@ -155,7 +155,7 @@ typedef boost::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
 extern BlockMap mapBlockIndex;
 extern uint64_t nLastBlockTx;
 extern uint64_t nLastBlockSize;
-extern uint64_t nLastBlockCost;
+extern uint64_t nLastBlockWeight;
 extern const std::string strMessageMagic;
 extern CWaitableCriticalSection csBestBlock;
 extern CConditionVariable cvBlockChange;
diff --git a/src/miner.cpp b/src/miner.cpp
index 8153fb9f9..25a5becf9 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -45,7 +45,7 @@ using namespace std;
 
 uint64_t nLastBlockTx = 0;
 uint64_t nLastBlockSize = 0;
-uint64_t nLastBlockCost = 0;
+uint64_t nLastBlockWeight = 0;
 
 class ScoreCompare
 {
@@ -77,30 +77,30 @@ BlockAssembler::BlockAssembler(const CChainParams& _chainparams)
     : chainparams(_chainparams)
 {
     // Block resource limits
-    // If neither -blockmaxsize or -blockmaxcost is given, limit to DEFAULT_BLOCK_MAX_*
+    // If neither -blockmaxsize or -blockmaxweight is given, limit to DEFAULT_BLOCK_MAX_*
     // If only one is given, only restrict the specified resource.
     // If both are given, restrict both.
-    nBlockMaxCost = DEFAULT_BLOCK_MAX_COST;
+    nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
     nBlockMaxSize = DEFAULT_BLOCK_MAX_SIZE;
-    bool fCostSet = false;
-    if (mapArgs.count("-blockmaxcost")) {
-        nBlockMaxCost = GetArg("-blockmaxcost", DEFAULT_BLOCK_MAX_COST);
+    bool fWeightSet = false;
+    if (mapArgs.count("-blockmaxweight")) {
+        nBlockMaxWeight = GetArg("-blockmaxweight", DEFAULT_BLOCK_MAX_WEIGHT);
         nBlockMaxSize = MAX_BLOCK_SERIALIZED_SIZE;
-        fCostSet = true;
+        fWeightSet = true;
     }
     if (mapArgs.count("-blockmaxsize")) {
         nBlockMaxSize = GetArg("-blockmaxsize", DEFAULT_BLOCK_MAX_SIZE);
-        if (!fCostSet) {
-            nBlockMaxCost = nBlockMaxSize * WITNESS_SCALE_FACTOR;
+        if (!fWeightSet) {
+            nBlockMaxWeight = nBlockMaxSize * WITNESS_SCALE_FACTOR;
         }
     }
 
-    // Limit cost to between 4K and MAX_BLOCK_COST-4K for sanity:
-    nBlockMaxCost = std::max((unsigned int)4000, std::min((unsigned int)(MAX_BLOCK_COST-4000), nBlockMaxCost));
+    // Limit weight to between 4K and MAX_BLOCK_WEIGHT-4K for sanity:
+    nBlockMaxWeight = std::max((unsigned int)4000, std::min((unsigned int)(MAX_BLOCK_WEIGHT-4000), nBlockMaxWeight));
     // Limit size to between 1K and MAX_BLOCK_SERIALIZED_SIZE-1K for sanity:
     nBlockMaxSize = std::max((unsigned int)1000, std::min((unsigned int)(MAX_BLOCK_SERIALIZED_SIZE-1000), nBlockMaxSize));
 
-    // Whether we need to account for byte usage (in addition to cost usage)
+    // Whether we need to account for byte usage (in addition to weight usage)
     fNeedSizeAccounting = (nBlockMaxSize < MAX_BLOCK_SERIALIZED_SIZE-1000);
 }
 
@@ -110,7 +110,7 @@ void BlockAssembler::resetBlock()
 
     // Reserve space for coinbase tx
     nBlockSize = 1000;
-    nBlockCost = 4000;
+    nBlockWeight = 4000;
     nBlockSigOpsCost = 400;
     fIncludeWitness = false;
 
@@ -167,7 +167,7 @@ CBlockTemplate* BlockAssembler::CreateNewBlock(const CScript& scriptPubKeyIn)
 
     nLastBlockTx = nBlockTx;
     nLastBlockSize = nBlockSize;
-    nLastBlockCost = nBlockCost;
+    nLastBlockWeight = nBlockWeight;
     LogPrintf("CreateNewBlock(): total size %u txs: %u fees: %ld sigops %d\n", nBlockSize, nBlockTx, nFees, nBlockSigOpsCost);
 
     // Create coinbase transaction.
@@ -223,8 +223,8 @@ void BlockAssembler::onlyUnconfirmed(CTxMemPool::setEntries& testSet)
 
 bool BlockAssembler::TestPackage(uint64_t packageSize, int64_t packageSigOpsCost)
 {
-    // TODO: switch to cost-based accounting for packages instead of vsize-based accounting.
-    if (nBlockCost + WITNESS_SCALE_FACTOR * packageSize >= nBlockMaxCost)
+    // TODO: switch to weight-based accounting for packages instead of vsize-based accounting.
+    if (nBlockWeight + WITNESS_SCALE_FACTOR * packageSize >= nBlockMaxWeight)
         return false;
     if (nBlockSigOpsCost + packageSigOpsCost >= MAX_BLOCK_SIGOPS_COST)
         return false;
@@ -257,17 +257,17 @@ bool BlockAssembler::TestPackageTransactions(const CTxMemPool::setEntries& packa
 
 bool BlockAssembler::TestForBlock(CTxMemPool::txiter iter)
 {
-    if (nBlockCost + iter->GetTxCost() >= nBlockMaxCost) {
+    if (nBlockWeight + iter->GetTxWeight() >= nBlockMaxWeight) {
         // If the block is so close to full that no more txs will fit
         // or if we've tried more than 50 times to fill remaining space
         // then flag that the block is finished
-        if (nBlockCost >  nBlockMaxCost - 400 || lastFewTxs > 50) {
+        if (nBlockWeight >  nBlockMaxWeight - 400 || lastFewTxs > 50) {
              blockFinished = true;
              return false;
         }
-        // Once we're within 4000 cost of a full block, only look at 50 more txs
+        // Once we're within 4000 weight of a full block, only look at 50 more txs
         // to try to fill the remaining space.
-        if (nBlockCost > nBlockMaxCost - 4000) {
+        if (nBlockWeight > nBlockMaxWeight - 4000) {
             lastFewTxs++;
         }
         return false;
@@ -315,7 +315,7 @@ void BlockAssembler::AddToBlock(CTxMemPool::txiter iter)
     if (fNeedSizeAccounting) {
         nBlockSize += ::GetSerializeSize(iter->GetTx(), SER_NETWORK, PROTOCOL_VERSION);
     }
-    nBlockCost += iter->GetTxCost();
+    nBlockWeight += iter->GetTxWeight();
     ++nBlockTx;
     nBlockSigOpsCost += iter->GetSigOpCost();
     nFees += iter->GetFee();
diff --git a/src/miner.h b/src/miner.h
index d16e37bb5..11753f5e4 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -141,11 +141,11 @@ private:
 
     // Configuration parameters for the block size
     bool fIncludeWitness;
-    unsigned int nBlockMaxCost, nBlockMaxSize;
+    unsigned int nBlockMaxWeight, nBlockMaxSize;
     bool fNeedSizeAccounting;
 
     // Information on the current status of the block
-    uint64_t nBlockCost;
+    uint64_t nBlockWeight;
     uint64_t nBlockSize;
     uint64_t nBlockTx;
     uint64_t nBlockSigOpsCost;
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index f2148bfe1..8617db00c 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -64,8 +64,8 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason)
     // almost as much to process as they cost the sender in fees, because
     // computing signature hashes is O(ninputs*txsize). Limiting transactions
     // to MAX_STANDARD_TX_SIZE mitigates CPU exhaustion attacks.
-    unsigned int sz = GetTransactionCost(tx);
-    if (sz >= MAX_STANDARD_TX_COST) {
+    unsigned int sz = GetTransactionWeight(tx);
+    if (sz >= MAX_STANDARD_TX_WEIGHT) {
         reason = "tx-size";
         return false;
     }
@@ -151,12 +151,12 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
     return true;
 }
 
-int64_t GetVirtualTransactionSize(int64_t nCost)
+int64_t GetVirtualTransactionSize(int64_t nWeight)
 {
-    return (nCost + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
+    return (nWeight + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
 }
 
 int64_t GetVirtualTransactionSize(const CTransaction& tx)
 {
-    return GetVirtualTransactionSize(GetTransactionCost(tx));
+    return GetVirtualTransactionSize(GetTransactionWeight(tx));
 }
diff --git a/src/policy/policy.h b/src/policy/policy.h
index 29a8cc57c..f5f8652fb 100644
--- a/src/policy/policy.h
+++ b/src/policy/policy.h
@@ -18,10 +18,10 @@ class CCoinsViewCache;
 static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000;
 /** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
 static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 0;
-/** Default for -blockmaxcost, which control the range of block costs the mining code will create **/
-static const unsigned int DEFAULT_BLOCK_MAX_COST = 3000000;
-/** The maximum size for transactions we're willing to relay/mine */
-static const unsigned int MAX_STANDARD_TX_COST = 400000;
+/** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/
+static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = 3000000;
+/** The maximum weight for transactions we're willing to relay/mine */
+static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;
 /** Maximum number of signature check operations in an IsStandard() P2SH script */
 static const unsigned int MAX_P2SH_SIGOPS = 15;
 /** The maximum number of sigops we're willing to relay/mine in a single tx */
@@ -66,8 +66,8 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason);
      */
 bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
 
-/** Compute the virtual transaction size (cost reinterpreted as bytes). */
-int64_t GetVirtualTransactionSize(int64_t nCost);
+/** Compute the virtual transaction size (weight reinterpreted as bytes). */
+int64_t GetVirtualTransactionSize(int64_t nWeight);
 int64_t GetVirtualTransactionSize(const CTransaction& tx);
 
 #endif // BITCOIN_POLICY_POLICY_H
diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index df900388f..0e6ab4dd7 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -32,11 +32,11 @@ std::string CBlock::ToString() const
     return s.str();
 }
 
-int64_t GetBlockCost(const CBlock& block)
+int64_t GetBlockWeight(const CBlock& block)
 {
-    // This implements the cost = (stripped_size * 4) + witness_size formula,
+    // This implements the weight = (stripped_size * 4) + witness_size formula,
     // using only serialization with and without witness data. As witness_size
     // is equal to total_size - stripped_size, this formula is identical to:
-    // cost = (stripped_size * 3) + total_size.
+    // weight = (stripped_size * 3) + total_size.
     return ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
 }
diff --git a/src/primitives/block.h b/src/primitives/block.h
index e2a309e63..72dfed985 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -154,7 +154,7 @@ struct CBlockLocator
     }
 };
 
-/** Compute the consensus-critical block cost (see BIP 141). */
-int64_t GetBlockCost(const CBlock& tx);
+/** Compute the consensus-critical block weight (see BIP 141). */
+int64_t GetBlockWeight(const CBlock& tx);
 
 #endif // BITCOIN_PRIMITIVES_BLOCK_H
diff --git a/src/primitives/transaction.cpp b/src/primitives/transaction.cpp
index 7f10409c0..8d6380564 100644
--- a/src/primitives/transaction.cpp
+++ b/src/primitives/transaction.cpp
@@ -121,7 +121,7 @@ unsigned int CTransaction::CalculateModifiedSize(unsigned int nTxSize) const
     // Providing any more cleanup incentive than making additional inputs free would
     // risk encouraging people to create junk outputs to redeem later.
     if (nTxSize == 0)
-        nTxSize = (GetTransactionCost(*this) + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
+        nTxSize = (GetTransactionWeight(*this) + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR;
     for (std::vector<CTxIn>::const_iterator it(vin.begin()); it != vin.end(); ++it)
     {
         unsigned int offset = 41U + std::min(110U, (unsigned int)it->scriptSig.size());
@@ -149,7 +149,7 @@ std::string CTransaction::ToString() const
     return str;
 }
 
-int64_t GetTransactionCost(const CTransaction& tx)
+int64_t GetTransactionWeight(const CTransaction& tx)
 {
     return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR -1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
 }
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index 8a2d5dd22..d37890667 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -459,7 +459,7 @@ struct CMutableTransaction
     uint256 GetHash() const;
 };
 
-/** Compute the cost of a transaction, as defined by BIP 141 */
-int64_t GetTransactionCost(const CTransaction &tx);
+/** Compute the weight of a transaction, as defined by BIP 141 */
+int64_t GetTransactionWeight(const CTransaction &tx);
 
 #endif // BITCOIN_PRIMITIVES_TRANSACTION_H
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 20eefa1c5..9dc896b7a 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -101,7 +101,7 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool tx
     result.push_back(Pair("confirmations", confirmations));
     result.push_back(Pair("strippedsize", (int)::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS)));
     result.push_back(Pair("size", (int)::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION)));
-    result.push_back(Pair("cost", (int)::GetBlockCost(block)));
+    result.push_back(Pair("weight", (int)::GetBlockWeight(block)));
     result.push_back(Pair("height", blockindex->nHeight));
     result.push_back(Pair("version", block.nVersion));
     result.push_back(Pair("versionHex", strprintf("%08x", block.nVersion)));
@@ -559,7 +559,7 @@ UniValue getblock(const UniValue& params, bool fHelp)
             "  \"confirmations\" : n,   (numeric) The number of confirmations, or -1 if the block is not on the main chain\n"
             "  \"size\" : n,            (numeric) The block size\n"
             "  \"strippedsize\" : n,    (numeric) The block size excluding witness data\n"
-            "  \"cost\" : n             (numeric) The block cost\n"
+            "  \"weight\" : n           (numeric) The block weight (BIP 141)\n"
             "  \"height\" : n,          (numeric) The block height or index\n"
             "  \"version\" : n,         (numeric) The block version\n"
             "  \"versionHex\" : \"00000000\", (string) The block version formatted in hexadecimal\n"
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 4c4e59978..92ca4bab6 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -224,7 +224,7 @@ UniValue getmininginfo(const UniValue& params, bool fHelp)
             "{\n"
             "  \"blocks\": nnn,             (numeric) The current block\n"
             "  \"currentblocksize\": nnn,   (numeric) The last block size\n"
-            "  \"currentblockcost\": nnn,   (numeric) The last block cost\n"
+            "  \"currentblockweight\": nnn, (numeric) The last block weight\n"
             "  \"currentblocktx\": nnn,     (numeric) The last block transaction\n"
             "  \"difficulty\": xxx.xxxxx    (numeric) The current difficulty\n"
             "  \"errors\": \"...\"          (string) Current errors\n"
@@ -243,7 +243,7 @@ UniValue getmininginfo(const UniValue& params, bool fHelp)
     UniValue obj(UniValue::VOBJ);
     obj.push_back(Pair("blocks",           (int)chainActive.Height()));
     obj.push_back(Pair("currentblocksize", (uint64_t)nLastBlockSize));
-    obj.push_back(Pair("currentblockcost", (uint64_t)nLastBlockCost));
+    obj.push_back(Pair("currentblockweight", (uint64_t)nLastBlockWeight));
     obj.push_back(Pair("currentblocktx",   (uint64_t)nLastBlockTx));
     obj.push_back(Pair("difficulty",       (double)GetDifficulty()));
     obj.push_back(Pair("errors",           GetWarnings("statusbar")));
@@ -358,7 +358,7 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
             "         ],\n"
             "         \"fee\": n,                   (numeric) difference in value between transaction inputs and outputs (in Satoshis); for coinbase transactions, this is a negative Number of the total collected block fees (ie, not including the block subsidy); if key is not present, fee is unknown and clients MUST NOT assume there isn't one\n"
             "         \"sigops\" : n,               (numeric) total SigOps cost, as counted for purposes of block limits; if key is not present, sigop cost is unknown and clients MUST NOT assume it is zero\n"
-            "         \"cost\" : n,                 (numeric) total transaction size cost, as counted for purposes of block limits\n"
+            "         \"weight\" : n,               (numeric) total transaction weight, as counted for purposes of block limits\n"
             "         \"required\" : true|false     (boolean) if provided and true, this transaction must be in the final block\n"
             "      }\n"
             "      ,...\n"
@@ -377,7 +377,7 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
             "  \"noncerange\" : \"00000000ffffffff\",   (string) A range of valid nonces\n"
             "  \"sigoplimit\" : n,                 (numeric) cost limit of sigops in blocks\n"
             "  \"sizelimit\" : n,                  (numeric) limit of block size\n"
-            "  \"costlimit\" : n,                  (numeric) limit of block cost\n"
+            "  \"weightlimit\" : n,                (numeric) limit of block weight\n"
             "  \"curtime\" : ttt,                  (numeric) current timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
             "  \"bits\" : \"xxx\",                 (string) compressed target of next block\n"
             "  \"height\" : n                      (numeric) The height of the next block\n"
@@ -575,7 +575,7 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
         int index_in_template = i - 1;
         entry.push_back(Pair("fee", pblocktemplate->vTxFees[index_in_template]));
         entry.push_back(Pair("sigops", pblocktemplate->vTxSigOpsCost[index_in_template]));
-        entry.push_back(Pair("cost", GetTransactionCost(tx)));
+        entry.push_back(Pair("weight", GetTransactionWeight(tx)));
 
         transactions.push_back(entry);
     }
@@ -659,7 +659,7 @@ UniValue getblocktemplate(const UniValue& params, bool fHelp)
     result.push_back(Pair("noncerange", "00000000ffffffff"));
     result.push_back(Pair("sigoplimit", (int64_t)MAX_BLOCK_SIGOPS_COST));
     result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_SERIALIZED_SIZE));
-    result.push_back(Pair("costlimit", (int64_t)MAX_BLOCK_COST));
+    result.push_back(Pair("weightlimit", (int64_t)MAX_BLOCK_WEIGHT));
     result.push_back(Pair("curtime", pblock->GetBlockTime()));
     result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
     result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index a48a6d946..691baa674 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -28,7 +28,7 @@ CTxMemPoolEntry::CTxMemPoolEntry(const CTransaction& _tx, const CAmount& _nFee,
     hadNoDependencies(poolHasNoInputsOf), inChainInputValue(_inChainInputValue),
     spendsCoinbase(_spendsCoinbase), sigOpCost(_sigOpsCost), lockPoints(lp)
 {
-    nTxCost = GetTransactionCost(_tx);
+    nTxWeight = GetTransactionWeight(_tx);
     nModSize = _tx.CalculateModifiedSize(GetTxSize());
     nUsageSize = RecursiveDynamicUsage(*tx) + memusage::DynamicUsage(tx);
 
@@ -75,7 +75,7 @@ void CTxMemPoolEntry::UpdateLockPoints(const LockPoints& lp)
 
 size_t CTxMemPoolEntry::GetTxSize() const
 {
-    return GetVirtualTransactionSize(nTxCost);
+    return GetVirtualTransactionSize(nTxWeight);
 }
 
 // Update the given tx for any in-mempool descendants.
diff --git a/src/txmempool.h b/src/txmempool.h
index e5a500e19..2c2127f32 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -78,7 +78,7 @@ class CTxMemPoolEntry
 private:
     std::shared_ptr<const CTransaction> tx;
     CAmount nFee;              //!< Cached to avoid expensive parent-transaction lookups
-    size_t nTxCost;            //!< ... and avoid recomputing tx cost (also used for GetTxSize())
+    size_t nTxWeight;          //!< ... and avoid recomputing tx weight (also used for GetTxSize())
     size_t nModSize;           //!< ... and modified size for priority
     size_t nUsageSize;         //!< ... and total memory usage
     int64_t nTime;             //!< Local time when entering the mempool
@@ -122,7 +122,7 @@ public:
     double GetPriority(unsigned int currentHeight) const;
     const CAmount& GetFee() const { return nFee; }
     size_t GetTxSize() const;
-    size_t GetTxCost() const { return nTxCost; }
+    size_t GetTxWeight() const { return nTxWeight; }
     int64_t GetTime() const { return nTime; }
     unsigned int GetHeight() const { return entryHeight; }
     bool WasClearAtEntry() const { return hadNoDependencies; }
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 46ed54215..4b6d98025 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2356,7 +2356,7 @@ bool CWallet::CreateTransaction(const vector<CRecipient>& vecSend, CWalletTx& wt
                 *static_cast<CTransaction*>(&wtxNew) = CTransaction(txNew);
 
                 // Limit size
-                if (GetTransactionCost(txNew) >= MAX_STANDARD_TX_COST)
+                if (GetTransactionWeight(txNew) >= MAX_STANDARD_TX_WEIGHT)
                 {
                     strFailReason = _("Transaction too large");
                     return false;