diff --git a/doc/release-process.md b/doc/release-process.md
index 197ed8c0a4..f67e0e2bf9 100644
--- a/doc/release-process.md
+++ b/doc/release-process.md
@@ -310,13 +310,13 @@ cat "$VERSION"/*/all.SHA256SUMS.asc > SHA256SUMS.asc
 Both variables are used as a guideline for how much space the user needs on their drive in total, not just strictly for the blockchain.
 Note that all values should be taken from a **fully synced** node and have an overhead of 5-10% added on top of its base value.
 
-To calculate `m_assumed_blockchain_size`, take the size in GiB of these directories:
+To calculate `m_assumed_blockchain_size`, take the size in GB of these directories:
 - For `mainnet` -> the data directory, excluding the `/testnet3`, `/testnet4`, `/signet`, and `/regtest` directories and any overly large files, e.g. a huge `debug.log`
 - For `testnet` -> `/testnet3`
 - For `testnet4` -> `/testnet4`
 - For `signet` -> `/signet`
 
-To calculate `m_assumed_chain_state_size`, take the size in GiB of these directories:
+To calculate `m_assumed_chain_state_size`, take the size in GB of these directories:
 - For `mainnet` -> `/chainstate`
 - For `testnet` -> `/testnet3/chainstate`
 - For `testnet4` -> `/testnet4/chainstate`
diff --git a/src/init.cpp b/src/init.cpp
index 10abd503fc..ab27d0ec4b 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1754,7 +1754,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
     // On first startup, warn on low block storage space
     if (!do_reindex && !do_reindex_chainstate && chain_active_height <= 1) {
-        uint64_t assumed_chain_bytes{chainparams.AssumedBlockchainSize() * 1024 * 1024 * 1024};
+        uint64_t assumed_chain_bytes{chainparams.AssumedBlockchainSize() * 1'000'000'000};
         uint64_t additional_bytes_needed{
             chainman.m_blockman.IsPruneMode() ?
                 std::min(chainman.m_blockman.GetPruneTarget(), assumed_chain_bytes) :
@@ -1766,7 +1766,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
                     "Approximately %u GB of data will be stored in this directory."
                 ),
                 fs::quoted(fs::PathToString(args.GetBlocksDirPath())),
-                chainparams.AssumedBlockchainSize()
+                additional_bytes_needed / 1'000'000'000
             ));
         }
     }