For example

web3.eth.estimateGas({from: eth.coinbase, to: eth.accounts[1], amount: web3.toWei(1, "ether")})

return 21001, but not 21000, so why?

1 Answer 1


It's a known issue being fixed "in the next release".

see thread here: https://github.com/ethereum/go-ethereum/issues/1590

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