Free Online Calculators
Basic, scientific, BMI, age and percentage calculators — all free, no signup required.
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Body Mass Index (BMI) = weight(kg) / height(m)²
BMI Categories:
Underweight: < 18.5 | Normal: 18.5–24.9
Overweight: 25–29.9 | Obese: ≥ 30
Underweight: < 18.5 | Normal: 18.5–24.9
Overweight: 25–29.9 | Obese: ≥ 30
Calculate exact age from date of birth to today or a specific date.
Three types of percentage calculations.
What is X% of Y?
% of
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X is what % of Y?
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% change from X to Y
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About Our Calculators
Unitafy offers a suite of free online calculators for everyday and scientific use. All calculations are performed instantly in your browser — no data is sent to any server.
Our scientific calculator supports trigonometric functions, logarithms, powers, factorials and more. The BMI calculator supports both metric and imperial units. The age calculator gives your exact age in years, months and days.