Math & Numbers
Unit Converter
Convert between common units of length, weight, temperature, area, and volume.
Convert between hundreds of units across length, weight, temperature, volume, speed, area, and more. Get instant, accurate conversions without memorizing formulas. Perfect for students, engineers, travelers, and everyday use.
Conversion Categories
Length
km, miles, feet, inches, cm, mm, nautical miles, and more.
Weight & Mass
kg, lbs, oz, grams, tons — metric and imperial.
Temperature
Celsius ↔ Fahrenheit ↔ Kelvin.
Volume & Speed
liters, gallons, m³, km/h, mph, and dozens more.
How to Convert Units
- Select the measurement category (e.g., Length).
- Enter your value and choose the source unit.
- Select the target unit — the conversion appears instantly.
FAQ
How accurate are the conversions?▾
All conversions use standard internationally recognized conversion factors and are accurate to at least 6 decimal places.
Can I convert between metric and imperial?▾
Yes — every category includes both metric and imperial units.
Common Conversions
- 1 mile = 1.60934 km
- 1 kg = 2.20462 lbs
- 0°C = 32°F
- 1 gallon (US) = 3.78541 liters
More Math & Numbers
Percentage Calculator
Calculate percentages, changes, and find what percent one number is of another
Random Number Generator
Generate random numbers within any range you set
BMI Calculator
Calculate your Body Mass Index with metric or imperial units
Tip Calculator & Bill Splitter
Calculate tip amount and split the bill among any group
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal
Roman Numeral Converter
Convert numbers to Roman numerals and back (1–3999)
Compound Interest Calculator
Calculate compound interest with year-by-year breakdown
Discount Price Calculator
Find final price, discount percentage, or original price
Statistics Calculator
Calculate mean, median, mode, standard deviation, and more
Prime Number Checker
Check if a number is prime and generate primes up to N
Loan & Mortgage Calculator
Calculate monthly payments, total interest, and full amortization schedule
Aspect Ratio Calculator
Calculate missing width or height from an aspect ratio. Supports 16:9, 4:3, and custom ratios
GPA Calculator
Calculate semester and cumulative GPA from courses, grades, and credit hours
Calorie & BMR Calculator
Calculate your BMR and daily calorie needs based on activity level and goal
Loan EMI Calculator
Calculate monthly EMI, total interest, and repayment for any loan.