Simple maths. Clear decisions.

PlainProfit is a free collection of calculators for pricing, selling and small-business planning. The aim is to make the costs behind a decision visible, with formulas you can check and examples you can follow.

How the tools work

Calculations run in your browser. There is no account, paywall or upload of your calculator inputs. Each tool explains its assumptions and shows a worked example. You can pin a result temporarily, change your assumptions and compare the difference.

Accuracy and editorial approach

The site is built with AI assistance. Formula outputs are checked with automated tests against worked examples, loss-making scenarios, invalid inputs and zero denominators. This is software testing, not certification by an accountant. Explanations distinguish contribution, margin, markup and net profit so that a correct calculation is not mistaken for a complete business forecast.

Methods are deliberately simple. We do not invent market benchmarks or claim a particular price will attract customers. Each tool states what it leaves out. If a formula changes, its example and tests should change with it.

Funding

The site currently shows no advertisements and has no affiliate links. It may apply for advertising support in future. Any advertising integration will require updated privacy information and applicable consent controls.

Limitations

These tools do not replace accounting, tax, legal or investment advice. Check your actual records and obligations before acting. Results are estimates based on your inputs, not promises of profit.

Read the calculation methodology or view contact information.