All Calculators

Every free tool on KwikSum in one place. No sign-up required.

Financial Tools

UK Salary CalculatorTake home pay after income tax, NI, student loan and pension. 2025/26 rates. Bill Split CalculatorSplit any bill fairly by income or equally between your group. Tip CalculatorWork out tips at any percentage and split between your group. Percentage CalculatorFind X% of Y, express X as a percentage of Y, or calculate percentage change. Loan & Mortgage CalculatorMonthly repayments, total interest and full amortisation schedule. VAT CalculatorAdd or remove UK VAT at 20%, 5% or any custom rate. Compound Interest CalculatorSee how savings and investments grow over time with compound returns. Discount CalculatorFind the sale price and how much you save for any percentage off.

Everyday & Health Tools

Unit ConverterLength, weight, temperature, volume, area, speed and data storage. Date CalculatorDays between dates, or add and subtract days, months and years. BMI CalculatorBody Mass Index in metric or imperial with NHS health categories. Cooking ConverterConvert cups, tablespoons, grams, millilitres and oven temperatures. Age CalculatorYour exact age in years, months, days, hours and minutes.

KwikSum offers 13 free online calculators covering financial tools (salary, tax, loans, VAT, tips, bill splitting, compound interest, discounts and percentages) and everyday tools (unit conversion, date calculations, BMI, cooking conversions and age). Every tool works instantly in your browser with no sign-up required.