Gas usage per unit test. Average gas usage per method. A mocha reporter.
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A mocha reporter for Truffle.

  • Gas usage per unit test.
  • Average gas usage per method.
  • Contract deployment costs.
  • Real currency costs.

screen shot 2018-08-01 at 10 13 56 am screen shot 2018-08-01 at 10 13 34 am


npm install --save-dev eth-gas-reporter

Truffle config

module.exports = {
  networks: {
  mocha: {
    reporter: 'eth-gas-reporter',
    reporterOptions : {
      currency: 'CHF',
      gasPrice: 21


Option Type Default Description
currency String 'EUR' National currency to represent gas costs in. Exchange rates loaded at runtime from the coinmarketcap api. Available currency codes can be found here.
gasPrice Number (varies) Denominated in gwei. Default is loaded at runtime from the eth gas station api
outputFile String stdout File path to write report output to
noColors Boolean false Suppress report color. Useful if you are printing to file b/c terminal colorization corrupts the text.
onlyCalledMethods Boolean true Omit methods that are never called from report.
rst Boolean false Output with a reStructured text code-block directive. Useful if you want to include report in RTD
rstTitle String "" Title for reStructured text header (See Travis for example output)
showTimeSpent Boolean false Show the amount of time spent as well as the gas consumed
src String "contracts" Folder in root directory to begin search for .sol files. This can also be a path to a subfolder relative to the root, e.g. "planets/annares/contracts"


Usage Notes

  • Requires Node >= 8.
  • Method calls that throw are filtered from the stats.
  • Contracts that are only ever created by other contracts within Solidity are not shown in the deployments table.


Please feel free to open a PR (or an issue) for anything. The units are an integration test and one of them is expected to fail, verifying that the table prints at the end of a suite even when there are errors. If you're adding an option, you can vaildate it in CI by adding it to the mock options config located here.


All the ideas in this utility have been borrowed from elsewhere. Many thanks to:

  • @maurelian - Mocha reporting gas instead of time is his idea.
  • @cag - The table borrows from / is based his gas statistics work for the Gnosis contracts.
  • Neufund - Block limit size ratios for contract deployments and euro pricing are borrowed from their ico-contracts test suite.