Business math, without the fog

Make the next number
make sense.

Business Math Tools turns everyday small-business questions into clear inputs, visible assumptions, and useful decisions.

Flagship tool

Know what each sale keeps.

See revenue, cost, gross profit, margin, and markup together. Reverse-calculate a price for the margin you want.

Gross margin42.5%Example output · currency agnostic

The field notes

Learn the difference between gross and net profit, why both matter, and how to read each number in a small business.

A calm, practical method for setting prices from costs, customer value, and the margin your business needs.

Calculate the sales volume or revenue that covers your fixed costs before profit begins.

Understand the two percentages, convert between them, and avoid common pricing mistakes.

See how each sale contributes to fixed costs and profit, with examples for services and products.

A straightforward guide to timing, runway, working capital, and decisions that protect cash.

Use per-customer revenue, variable cost, and contribution to test whether a product or service can scale.

Model the extra volume a discount must create to preserve gross profit dollars.