How do you calculate gas limit for transaction with data in Ethereum?

Question

What is the correct algorithm to calculate gas limit for transaction with data in Ethereum?

It's not a duplicate! The attached QA has nothing to do with arbitrary data cost estimation. — Slava Fomin II, Feb 16 '18 at 14:33

score 14 · Accepted Answer · edited Jun 16 '20 at 10:58

14

According to Ethereum Yellow Paper, in order to calculate gas limit for transaction with non-zero data you will need to use the following formula:

gasLimit = G_transaction + G_{txdatanonzero} × dataByteLength

where:

G_transaction = 21000 gas

G_{txdatanonzero} = 68 gas

dataByteLength — your data size in bytes

So, the final formula would look like this:

gasLimit = 21000 + 68 * dataByteLength.

If your data has 10 bytes, the gas limit would be:

gasLimit = 21000 + 68 * 10 = 21000 + 680 = 21680

edited Jun 16 '20 at 10:58

Community

answered Feb 12 '18 at 17:47

Slava Fomin II

will it be different if I'm sending to a contract address? – tristantzara Jul 19 '19 at 07:43
How I can calculate dataByteLenght of my transaction? – Giacomo Brunetta Jan 22 '21 at 19:04
1

Keep in mind if you're sending to a smart contract, that smart contract's internal functions will require additional gas depending on what all they do. – Albert Renshaw Oct 13 '21 at 04:19
What's a reliable way to estimate the gas if we are calling a function on the smart contract? There is a rpcProvider.estimateGas(txn) method I can use, but it will fail to estimate the gas sometimes on some complicated functions – Yao Jan 04 '23 at 19:30
the answer should be outdated as of EIP-1559 release?? – cryptoKTM Jan 24 '24 at 05:25

1 Answers1