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Calculators & Converters
Quick math and unit conversions — fast, accurate, and mobile-friendly. No sign-up needed.
Math & Everyday
Age Calculator
Exact age in years, months & days
Percentage Calculator
What is X% of Y? Reverse too
Tip Calculator
Split bills & add gratuity
GPA Calculator
Weighted & unweighted GPA
Temperature Converter
°C ↔ °F ↔ Kelvin
Discount Calculator
Price after sales & coupons
Sales Tax Calculator
Calculate tax & final price
Scientific Calculator
Full scientific calculator
Roman Numerals
Convert to/from Roman numerals
Number to Words
1234 → one thousand two hundred
Finance
Loan Calculator
Payments, interest & total cost
Mortgage Calculator
Monthly payment & amortization
Compound Interest
Growth with compounding periods
Salary Calculator
Hourly ↔ annual conversions
Currency Converter
Live exchange rates worldwide
Credit Card Payoff
Pay off your credit card faster
Debt Payoff Calculator
Plan your debt-free date
Savings Calculator
Grow your savings over time
Inflation Calculator
See how inflation affects money
ROI Calculator
Return on investment calculator
Unit Conversions
Length Converter
Inches, cm, meters, miles
Weight Converter
Pounds, kilos, ounces & more
Unit Converter
Length, weight, area, volume
Area Calculator
Squares, circles, triangles
Volume Calculator
Prisms, cylinders, spheres
Military Time
12-hour ↔ 24-hour instantly
Cooking Converter
Cups, tbsp, ml, oz & more
Shoe Size Converter
US, UK, EU & CM sizes
Clothing Size Converter
US, UK, EU & Asian sizes
Fuel Efficiency
MPG ↔ L/100km + trip cost
Health & Body
BMI Calculator
Body mass index from height & weight
Body Fat Calculator
Estimate body fat percentage
Calories Burned
Calories burned during activities
Blood Type Compatibility
Find compatible blood types
Ideal Weight Calculator
Your healthy weight range
Water Intake Calculator
Daily water needs by weight
Pregnancy Due Date
Estimate your due date
Ovulation Calculator
Find your fertile window
Heart Rate Zones
Training zones by age
Sleep Cycle Calculator
Best times to wake up