Calculators
Free online calculators for percentages, loans, BMI, age, discounts and more — fast, accurate, and mobile-friendly.
Calculators remove the small daily friction of working something out by hand — and the risk of a slipped decimal point when the answer actually matters. This collection covers the numbers most people reach for: percentages for discounts and tips, BMI for a quick health screen, loan repayments before you sign anything, exact ages and date gaps, and sale prices at a glance. Each one runs instantly in your browser and updates as you type, so you can explore "what if" scenarios rather than committing to a single sum.
Free percentage calculator.
Calculators BMI CalculatorCalculate your Body Mass Index (BMI) in metric or imperial units.
Calculators Loan EMI CalculatorCalculate your loan EMI (equated monthly instalment), total interest, and total repayment.
Calculators Age CalculatorCalculate exact age from a date of birth: years, months, days, and total days lived.
Calculators Discount CalculatorCalculate the sale price and money saved for any discount percentage.
Calculators Tip CalculatorFree tip calculator.
Calculators Unit ConverterFree online unit converter for length, weight, temperature, volume, area, speed and digital storage.
Calculators GPA CalculatorFree GPA calculator.
Calculators Sales Tax CalculatorFree sales tax calculator.
Built for real decisions, not just homework
The value of a good calculator isn't only the answer — it's the confidence to act on it. A loan calculator that shows total interest alongside the monthly payment changes how you compare two offers. A discount calculator that reveals the true saving behind a "50% + 20%" sticker stops you overpaying. We've written a plain-language explanation under every tool so you understand where the number comes from, which matters far more than blindly trusting a box.
Private and instant
Nothing you type is uploaded or stored. The maths happens entirely on your device, which means results appear the moment you finish typing and your figures never leave your browser. That's especially reassuring for anything tied to your finances or health. Pick a tool below to get started, and check the guidance beneath each one if you want to understand the formula as well as the result.