About Sumwick

Business numbers, made clearer.

Sumwick helps sellers, creators, freelancers, and online businesses understand everyday calculations.

Useful tools, explained

Our calculators turn the numbers you enter into results with clear formulas, examples, and assumptions. Related guides explain the concepts behind them.

Simple by design

The tools are free, with no account needed. Calculations happen in your browser, and Sumwick does not save or send your calculator inputs to a server.

Accuracy and limits

Results are estimates based on your inputs and the assumptions shown on each page. Check that your costs and units match your situation. Tools do not replace professional accounting, tax, or financial advice.

Read our editorial policy or browse the calculators.