diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index c6d5db786..9acb3fd30 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -239,7 +239,7 @@ static void MutateTxAddInput(CMutableTransaction& tx, const std::string& strInpu
     uint256 txid(uint256S(strTxid));
 
     static const unsigned int minTxOutSz = 9;
-    static const unsigned int maxVout = MAX_BLOCK_BASE_SIZE / minTxOutSz;
+    static const unsigned int maxVout = MAX_BLOCK_WEIGHT / (WITNESS_SCALE_FACTOR * minTxOutSz);
 
     // extract and validate vout
     std::string strVout = vStrInputParts[1];
diff --git a/src/blockencodings.cpp b/src/blockencodings.cpp
index 9cac10d2b..7adab586e 100644
--- a/src/blockencodings.cpp
+++ b/src/blockencodings.cpp
@@ -15,8 +15,6 @@
 
 #include <unordered_map>
 
-#define MIN_TRANSACTION_BASE_SIZE (::GetSerializeSize(CTransaction(), SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS))
-
 CBlockHeaderAndShortTxIDs::CBlockHeaderAndShortTxIDs(const CBlock& block, bool fUseWTXID) :
         nonce(GetRand(std::numeric_limits<uint64_t>::max())),
         shorttxids(block.vtx.size() - 1), prefilledtxn(1), header(block) {
@@ -50,7 +48,7 @@ uint64_t CBlockHeaderAndShortTxIDs::GetShortID(const uint256& txhash) const {
 ReadStatus PartiallyDownloadedBlock::InitData(const CBlockHeaderAndShortTxIDs& cmpctblock, const std::vector<std::pair<uint256, CTransactionRef>>& extra_txn) {
     if (cmpctblock.header.IsNull() || (cmpctblock.shorttxids.empty() && cmpctblock.prefilledtxn.empty()))
         return READ_STATUS_INVALID;
-    if (cmpctblock.shorttxids.size() + cmpctblock.prefilledtxn.size() > MAX_BLOCK_BASE_SIZE / MIN_TRANSACTION_BASE_SIZE)
+    if (cmpctblock.shorttxids.size() + cmpctblock.prefilledtxn.size() > MAX_BLOCK_WEIGHT / MIN_SERIALIZEABLE_TRANSACTION_WEIGHT)
         return READ_STATUS_INVALID;
 
     assert(header.IsNull() && txn_available.empty());
diff --git a/src/coins.cpp b/src/coins.cpp
index b5dc6197b..e30bda930 100644
--- a/src/coins.cpp
+++ b/src/coins.cpp
@@ -245,7 +245,8 @@ bool CCoinsViewCache::HaveInputs(const CTransaction& tx) const
     return true;
 }
 
-static const size_t MAX_OUTPUTS_PER_BLOCK = MAX_BLOCK_BASE_SIZE /  ::GetSerializeSize(CTxOut(), SER_NETWORK, PROTOCOL_VERSION); // TODO: merge with similar definition in undo.h.
+static const size_t MIN_TRANSACTION_OUTPUT_WEIGHT = WITNESS_SCALE_FACTOR * ::GetSerializeSize(CTxOut(), SER_NETWORK, PROTOCOL_VERSION);
+static const size_t MAX_OUTPUTS_PER_BLOCK = MAX_BLOCK_WEIGHT / MIN_TRANSACTION_OUTPUT_WEIGHT;
 
 const Coin& AccessByTxid(const CCoinsViewCache& view, const uint256& txid)
 {
diff --git a/src/consensus/consensus.h b/src/consensus/consensus.h
index 58b2ed4b3..a1bb99a80 100644
--- a/src/consensus/consensus.h
+++ b/src/consensus/consensus.h
@@ -6,25 +6,23 @@
 #ifndef BITCOIN_CONSENSUS_CONSENSUS_H
 #define BITCOIN_CONSENSUS_CONSENSUS_H
 
+#include <stdlib.h>
 #include <stdint.h>
 
 /** 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 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).
- * This parameter is largely superfluous because it is directly implied by the above block
- *  weight limit, even when BIP 141 is not active.  It continues to exist for use in
- *  various early tests that run before the witness data has been checked.
- * All tests related to it could be removed without breaking consensus compatibility.
- */
-static const unsigned int MAX_BLOCK_BASE_SIZE = 1000000;
 /** The maximum allowed number of signature check operations in a block (network rule) */
 static const int64_t MAX_BLOCK_SIGOPS_COST = 80000;
 /** Coinbase transaction outputs can only be spent after this number of new blocks (network rule) */
 static const int COINBASE_MATURITY = 100;
 
+static const int WITNESS_SCALE_FACTOR = 4;
+
+static const size_t MIN_TRANSACTION_WEIGHT = WITNESS_SCALE_FACTOR * 60; // 60 is the lower bound for the size of a valid serialized CTransaction
+static const size_t MIN_SERIALIZEABLE_TRANSACTION_WEIGHT = WITNESS_SCALE_FACTOR * 10; // 10 is the lower bound for the size of a serialized CTransaction
+
 /** Flags for nSequence and nLockTime locks */
 enum {
     /* Interpret sequence numbers as relative lock-time constraints. */
diff --git a/src/consensus/tx_verify.cpp b/src/consensus/tx_verify.cpp
index 0671cbc13..0a71915d1 100644
--- a/src/consensus/tx_verify.cpp
+++ b/src/consensus/tx_verify.cpp
@@ -164,7 +164,7 @@ bool CheckTransaction(const CTransaction& tx, CValidationState &state, bool fChe
     if (tx.vout.empty())
         return state.DoS(10, false, REJECT_INVALID, "bad-txns-vout-empty");
     // Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
-    if (::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) > MAX_BLOCK_BASE_SIZE)
+    if (::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT)
         return state.DoS(100, false, REJECT_INVALID, "bad-txns-oversize");
 
     // Check for negative or overflow output values
diff --git a/src/consensus/validation.h b/src/consensus/validation.h
index 8fc3ef1b6..5494ce40e 100644
--- a/src/consensus/validation.h
+++ b/src/consensus/validation.h
@@ -7,6 +7,10 @@
 #define BITCOIN_CONSENSUS_VALIDATION_H
 
 #include <string>
+#include "version.h"
+#include "consensus/consensus.h"
+#include "primitives/transaction.h"
+#include "primitives/block.h"
 
 /** "reject" message codes */
 static const unsigned char REJECT_MALFORMED = 0x01;
@@ -85,4 +89,18 @@ public:
     std::string GetDebugMessage() const { return strDebugMessage; }
 };
 
+static inline 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);
+}
+
+static inline int64_t GetBlockWeight(const CBlock& block)
+{
+    // 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:
+    // 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);
+}
+
 #endif // BITCOIN_CONSENSUS_VALIDATION_H
diff --git a/src/core_write.cpp b/src/core_write.cpp
index 7f38e9e56..a366ef933 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -5,7 +5,8 @@
 #include "core_io.h"
 
 #include "base58.h"
-#include "primitives/transaction.h"
+#include "consensus/consensus.h"
+#include "consensus/validation.h"
 #include "script/script.h"
 #include "script/standard.h"
 #include "serialize.h"
@@ -15,7 +16,6 @@
 #include "utilmoneystr.h"
 #include "utilstrencodings.h"
 
-
 std::string FormatScript(const CScript& script)
 {
     std::string ret;
diff --git a/src/merkleblock.cpp b/src/merkleblock.cpp
index 78d7cd600..ba5f7b400 100644
--- a/src/merkleblock.cpp
+++ b/src/merkleblock.cpp
@@ -153,7 +153,7 @@ uint256 CPartialMerkleTree::ExtractMatches(std::vector<uint256> &vMatch, std::ve
     if (nTransactions == 0)
         return uint256();
     // check for excessively high numbers of transactions
-    if (nTransactions > MAX_BLOCK_BASE_SIZE / 60) // 60 is the lower bound for the size of a serialized CTransaction
+    if (nTransactions > MAX_BLOCK_WEIGHT / MIN_TRANSACTION_WEIGHT)
         return uint256();
     // there can never be more hashes provided than one for every txid
     if (vHash.size() > nTransactions)
diff --git a/src/policy/policy.cpp b/src/policy/policy.cpp
index 2f78d2f34..9f2d623e7 100644
--- a/src/policy/policy.cpp
+++ b/src/policy/policy.cpp
@@ -7,6 +7,7 @@
 
 #include "policy/policy.h"
 
+#include "consensus/validation.h"
 #include "validation.h"
 #include "coins.h"
 #include "tinyformat.h"
diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index 9a979094c..24be67c84 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -31,12 +31,3 @@ std::string CBlock::ToString() const
     }
     return s.str();
 }
-
-int64_t GetBlockWeight(const CBlock& block)
-{
-    // 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:
-    // 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 f03cf4850..c90a1dfa6 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -152,7 +152,4 @@ struct CBlockLocator
     }
 };
 
-/** 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 a0d7793f9..f87934d58 100644
--- a/src/primitives/transaction.cpp
+++ b/src/primitives/transaction.cpp
@@ -114,8 +114,3 @@ std::string CTransaction::ToString() const
         str += "    " + vout[i].ToString() + "\n";
     return str;
 }
-
-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 00ac0b92b..f1dd51b9f 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -6,6 +6,7 @@
 #ifndef BITCOIN_PRIMITIVES_TRANSACTION_H
 #define BITCOIN_PRIMITIVES_TRANSACTION_H
 
+#include <stdint.h>
 #include "amount.h"
 #include "script/script.h"
 #include "serialize.h"
@@ -13,8 +14,6 @@
 
 static const int SERIALIZE_TRANSACTION_NO_WITNESS = 0x40000000;
 
-static const int WITNESS_SCALE_FACTOR = 4;
-
 /** An outpoint - a combination of a transaction hash and an index n into its vout */
 class COutPoint
 {
@@ -411,7 +410,4 @@ typedef std::shared_ptr<const CTransaction> CTransactionRef;
 static inline CTransactionRef MakeTransactionRef() { return std::make_shared<const CTransaction>(); }
 template <typename Tx> static inline CTransactionRef MakeTransactionRef(Tx&& txIn) { return std::make_shared<const CTransaction>(std::forward<Tx>(txIn)); }
 
-/** 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/mining.cpp b/src/rpc/mining.cpp
index 046c85a76..10bb341e5 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -645,15 +645,16 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
     result.push_back(Pair("mutable", aMutable));
     result.push_back(Pair("noncerange", "00000000ffffffff"));
     int64_t nSigOpLimit = MAX_BLOCK_SIGOPS_COST;
+    int64_t nSizeLimit = MAX_BLOCK_SERIALIZED_SIZE;
     if (fPreSegWit) {
         assert(nSigOpLimit % WITNESS_SCALE_FACTOR == 0);
         nSigOpLimit /= WITNESS_SCALE_FACTOR;
+        assert(nSizeLimit % WITNESS_SCALE_FACTOR == 0);
+        nSizeLimit /= WITNESS_SCALE_FACTOR;
     }
     result.push_back(Pair("sigoplimit", nSigOpLimit));
-    if (fPreSegWit) {
-        result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_BASE_SIZE));
-    } else {
-        result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_SERIALIZED_SIZE));
+    result.push_back(Pair("sizelimit", nSizeLimit));
+    if (!fPreSegWit) {
         result.push_back(Pair("weightlimit", (int64_t)MAX_BLOCK_WEIGHT));
     }
     result.push_back(Pair("curtime", pblock->GetBlockTime()));
diff --git a/src/test/sigopcount_tests.cpp b/src/test/sigopcount_tests.cpp
index eddb80aed..d3b8b0722 100644
--- a/src/test/sigopcount_tests.cpp
+++ b/src/test/sigopcount_tests.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "consensus/tx_verify.h"
+#include "consensus/validation.h"
 #include "pubkey.h"
 #include "key.h"
 #include "script/script.h"
diff --git a/src/undo.h b/src/undo.h
index 3749d5d7a..0f9d041bb 100644
--- a/src/undo.h
+++ b/src/undo.h
@@ -60,7 +60,8 @@ public:
     TxInUndoDeserializer(Coin* coin) : txout(coin) {}
 };
 
-static const size_t MAX_INPUTS_PER_BLOCK = MAX_BLOCK_BASE_SIZE / ::GetSerializeSize(CTxIn(), SER_NETWORK, PROTOCOL_VERSION);
+static const size_t MIN_TRANSACTION_INPUT_WEIGHT = WITNESS_SCALE_FACTOR * ::GetSerializeSize(CTxIn(), SER_NETWORK, PROTOCOL_VERSION);
+static const size_t MAX_INPUTS_PER_BLOCK = MAX_BLOCK_WEIGHT / MIN_TRANSACTION_INPUT_WEIGHT;
 
 /** Undo information for a CTransaction */
 class CTxUndo
diff --git a/src/validation.cpp b/src/validation.cpp
index 16d11529b..c10149760 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2803,7 +2803,7 @@ bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::P
     // checks that use witness data may be performed here.
 
     // Size limits
-    if (block.vtx.empty() || block.vtx.size() > MAX_BLOCK_BASE_SIZE || ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) > MAX_BLOCK_BASE_SIZE)
+    if (block.vtx.empty() || block.vtx.size() * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT || ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT)
         return state.DoS(100, false, REJECT_INVALID, "bad-blk-length", false, "size limits failed");
 
     // First transaction must be coinbase, the rest must not be