PercentNinja is an independent educational calculator site created to help individuals and small businesses make accurate percentage and pricing calculations quickly.
PercentNinja is a lightweight set of percentage calculators designed for speed and clarity. The goal is simple: answer common percentage questions with clean formulas, worked examples, and copyable results — without clutter.
These tools are built for everyday use (shopping, VAT, tips) and learning (understanding percentages, change, and proportions). If you spot an issue or want a calculator added, use the contact page.
PercentNinja is an independent UK-based website created by Andrew Haigh to provide free percentage and pricing calculators for businesses, online sellers, and everyday use.