X% of Y: Find a percentage of any number. Example: 15% of 200 = 30.
% Change: Calculate how much something increased or decreased. Example: 80→100 = +25%.
X is % of Y: Find what percentage one number is of another. Example: 45 out of 300 = 15%.
Discount: Enter original price and discount % to get the final sale price and savings.
BMI Calculator
Your BMI
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UnderweightNormalOverweightObese
BMI Categories
Underweight BMI below 18.5 — May indicate malnutrition or other health conditions
Normal weight BMI 18.5–24.9 — Healthy weight range for most adults
Overweight BMI 25–29.9 — Increased risk of health problems
Obese BMI 30 or above — High risk — consult a healthcare professional
BMI is a screening tool, not a diagnostic measurement. Consult your doctor for personalized advice.
Loan EMI Calculator
Monthly EMI
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Principal Amount
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Total Interest
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Total Repayment
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Tenure (Months)
EMI Breakdown
PrincipalInterest
EMI = [P × r × (1+r)ⁿ] ÷ [(1+r)ⁿ – 1] where r = monthly interest rate, n = number of months.
Age Calculator
Your Exact Age
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Total Months
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Total Weeks
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Total Days
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Days to Next Birthday
Age Facts
Enter your date of birth to see fun facts about your age, including your age in hours, minutes, your next birthday countdown, and your day of birth.
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Total Hours Lived
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Day You Were Born
Unit Converter
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Currency Converter
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Converted Amount
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⚠ Exchange rates are approximate reference values. For live rates, check your bank or a financial service.
Quick Reference Rates (USD Base)
Why Use Our Free Online Calculator?
⚡ Instant Results
Get calculations in milliseconds without page reloads. Our calculator processes everything client-side — fast and private.
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No data is sent to any server. All calculations happen locally in your browser. Your numbers stay yours.
🌐 8 Calculators in One
Basic, Scientific, Percentage, BMI, Loan EMI, Age, Unit Converter, and Currency — all in a single, free tool.
🎓 Trusted Formulas
Every formula follows international standards: WHO BMI guidelines, standard EMI formula, ISO unit definitions, and more.
♿ Accessible
Built with ARIA labels, keyboard navigation, and high-contrast colors for users of all abilities.
Frequently Asked Questions
Select the calculator type from the tabs at the top — Basic, Scientific, Percentage, BMI, Loan EMI, Age, Unit, or Currency. Enter your values in the input fields and tap Calculate (or type directly on the basic/scientific keyboard). Results appear instantly below.
Yes. All 8 calculator modes are 100% free with no sign-up, no account, no paywalled features, and no usage limits. You can bookmark this page and use it anytime.
The BMI is calculated using the standard WHO formula: BMI = weight(kg) ÷ height(m)². For imperial units, we convert to metric first. BMI is a screening tool — consult a healthcare professional for medical advice.
Loan EMI = [P × r × (1+r)ⁿ] ÷ [(1+r)ⁿ – 1], where P = principal amount, r = monthly interest rate (annual rate ÷ 12 ÷ 100), and n = number of monthly installments. This is the standard reducing balance method used by banks worldwide.
Yes. The scientific calculator supports sin, cos, tan (in degrees), log (base 10), ln (natural log), square root, square, power, factorial, inverse (1/x), and constants π and e.
The currency converter uses approximate reference rates for major world currencies. For live, real-time rates for financial transactions, please verify with your bank or a dedicated forex platform.