About this tool
Sales Commission Calculator is a free, in-browser tool that works out commission earned under four common pay structures: a flat rate, marginal tiers, a base salary plus commission, or a capped plan. Pick a mode, enter your sales, and the commission, total pay and effective rate update live. Nothing is uploaded — all math runs on your device.
Flat rate is simply sales × rate ÷ 100. Tiered mode uses marginal brackets: each bracket has a threshold and a rate, and each rate applies only to the portion of sales that falls within that bracket, exactly like progressive tax brackets. Base plus commission adds a fixed salary to the flat commission, and capped mode limits the commission to a maximum. The effective rate tile is commission ÷ sales × 100, so you can compare plans on one scale.
Use it to check a commission statement, model a new comp plan, or see how tiers reward higher sales. Add or remove tier rows to match your plan, and the marginal calculation credits each threshold's rate to the sales above it.