A little about CalculateMyBusiness
Useful maths.
Clearly explained.
Everyday life and small business
CalculateMyBusiness is a collection of free calculators by Psynapse. It brings everyday maths, time, recipes, unit conversions and practical business tools together in a quiet, accessible interface. You can use the tools without an account.
How the calculations work
Each tool displays its formula, worked example and assumptions. Numeric inputs accept plain numbers with up to six decimal places. Time and date tools use explicit clock and calendar inputs; recipe and weighted-bill tools accept labelled rows. Results use British-English number formatting; money is displayed to two decimal places. The underlying calculations retain more precision, and whole-unit break-even calculations use exact decimal arithmetic at the supported input precision.
Clear boundaries
Currency choices change formatting only. They do not convert exchange rates. Pricing tools use the costs and values you enter; they do not add taxes, recommend rates or forecast business performance. Results are useful arithmetic estimates within each tool’s stated assumptions.
Made to stay lightweight
Public pages are generated as HTML and calculations run on your device. This keeps the experience fast and avoids needing a database or a paid service for each calculation.