Estimate Gas Cost before SendTransaction

Question

How meta estimating gas cost before broadcasting.

How can I calculate gas cost for myfunc() in web3js?

function myfunc(){
   require(msg.sender == owner)
   ...
}

await contractInstance.myfunc.sendTransaction(); //it sends the transaction and wastes the gas if `myfunc` will fail.

Is there any best way to know gas cost before call solidity myfunc(), its saves gas for me ? (Similar like metamask)

score 0 · Accepted Answer · answered Feb 12 '18 at 14:23

0

web3 has an estimateGas method you can use to estimate the gas required for the transaction. You can use it for contract methods as well.

answered Feb 12 '18 at 14:23

Howard

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score 0 · Answer 2 · answered Feb 12 '18 at 14:24

0

Yes there is way but not that much accurate. Just add 10 or 20% extra gas.

contractInstance.method.estimateGas(ARGS...);

Please have a look below link

how to estimate gas cost?

answered Feb 12 '18 at 14:24

Jitendra Kumar. Balla

2,154
1
8
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How do you add 10 - 20%? – Shamoon Jun 28 '18 at 15:31

Estimate Gas Cost before SendTransaction

2 Answers2