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

Calculate exact age from date of birth to today or a specific date.

Three types of percentage calculations.

What is X% of Y?
% of = --
X is what % of Y?
is = -- %
% change from X to Y
to = -- %

💰 Finance Calculators

20+ free finance tools — loans, investments, savings, tax and budgeting.

🏦 EMI Calculator 🏠 Mortgage Calculator ⚖️ Loan Comparison 📈 SIP Calculator 🏦 FD Calculator 💰 RD Calculator 🏛️ PPF Calculator 📜 NSC & KVP 📈 Compound Interest 🧮 Simple Interest 📉 Inflation Calculator 🎯 Savings Goal 🧾 Income Tax India 📋 Budget Planner 💎 Net Worth 📊 Break-Even

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.