Steam Market Fee Calculator

An open-source, dependency-free calculator for estimating Steam Community Market fees. It works in integer minor units so percentage fees, minimum component fees, and rounding are explicit.

• Calculate the buyer-facing price from a desired seller receipt.
• Reverse an exact buyer-facing price into seller proceeds and fees.
• Configure Steam and publisher fee rates.
• Run entirely in the browser with no account or tracking.

Try the GitHub Pages calculator.

For reproducible boundary checks, open the integer fee invariants notebook.

Related live service

This reference is maintained by contributors working on SteamVaults, an independent third-party service currently focused on buying and selling Steam Sacks of Gems with USDT. The same fee rules power its hosted Steam Market fee calculator. The live service and this general-purpose fee calculator are separate projects.

Usage

import {
  buyerPriceForSellerAmount,
  sellerAmountForBuyerPrice,
} from './src/fees.js';

buyerPriceForSellerAmount(100);
// { sellerReceives: 100, steamFee: 5, publisherFee: 10,
//   totalFees: 15, buyerPays: 115 }

sellerAmountForBuyerPrice(115);
// { sellerReceives: 100, steamFee: 5, publisherFee: 10,
//   totalFees: 15, buyerPays: 115 }

Values are integers in the currency's smallest configured unit. The defaults model USD cents with a 5% Steam fee, a 10% publisher fee, and a one-cent minimum for each component.

Terms this model assumes

The calculator only applies to listings that Steam actually charges a fee on, so a few Steam Market concepts are worth having straight before reading the numbers:

• Marketable — whether an item may be listed on the Community Market at all. Unmarketable items never reach a fee calculation.
• Market hash name — the stable listing identifier used to look a price up, independent of display language.
• Steam Wallet — where the seller amount returned by this library lands. It is store credit, not a cash balance.

Verify

npm test

Accuracy note

Steam can change fee rules, publisher fees, currency increments, minimums, and taxes. This utility is an estimate; confirm the final amount in Steam before listing an item. The project is independent and is not affiliated with Valve or Steam.

License

MIT