What is the right way to calculate gas price and limit for contract deployment?

Question

I have tried several times and reached up to a gasPrice of 65 Gwei and a gasLimit of 500,000 which is $7.6 and still the deployment fails with error "Out of gas".
After spending tens of USD without getting the fees back - how can I calculate how much gas will be enough for deploying my contract?

Shane Fontaine · Answer

If you are using Remix and MetaMask (ass your tags imply), then it should be calculated for you automatically (they use the eth_estimateGas RPC call under the hood). If that is the case, you should not manually enter a gasLimit of 500,000 and instead use their estimated gas.
As a note, any gas that is unused in the transaction is returned to you. For example, if your contract costs 1,000,000 gas to deploy and you use gasLimit = 5,000,000, then your contract will be deployed and you will only have spent 1,000,000 gas.

What is the right way to calculate gas price and limit for contract deployment?

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