Everyday calculators — free, private, no signup. Each one has its own page.
Find your exact age in years, months, and days.
Open calculatorCalculate your Body Mass Index from height and weight.
Open calculatorX% of Y, percent of a total, increase, decrease, and difference.
Open calculatorTrig, logs, powers, memory functions, and full keyboard support.
Open calculatorLength, weight, temperature, area, volume, speed, time, and data.
Open calculatorThese are the everyday calculators people actually search for: working out age from a birth date, BMI from height and weight, a percentage change, a scientific expression, or converting between units like length, weight and temperature. Each one is a dedicated page with its own formula shown alongside the result, rather than a single generic calculator trying to do everything at once.
Calculators give estimates based on the numbers you enter, so check inputs and units, especially for money and health. Results are not financial, medical or legal advice. Our guide on calculating discounts shows the maths behind one of the most common tools.
All calculations run in your browser and update instantly. Nothing you type is sent to a server, so you can try different scenarios freely.
Are these calculators accurate for financial or medical decisions?
They use standard, published formulas (e.g. the standard BMI formula) and are useful for quick estimates, but for medical, legal, or financial decisions you should confirm with a qualified professional.
Do I need to create an account to use a calculator?
No. Every calculator on this page works instantly with no sign-up, and nothing you type is sent to a server.
Where are the loan, tax, and currency calculators?
EMI, GST, compound interest, income percentile, and currency conversion live under Finance Tools, since they're grounded in money rather than general math.
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