Conversion calculator
Convert metric and standard units.
Use quick metric to standard conversions and standard to metric conversions for length, weight, volume, area, and temperature. Choose the conversion type, enter a value, and get the result instantly.
Calculator
Metric and Standard Converter
Useful for recipes, travel, shopping, vehicle specs, home projects, and quick everyday math.
Choose a conversion and enter a value.
Popular conversions
Metric to standard and standard to metric
This unit conversion calculator handles common everyday conversions including miles to kilometers, kilometers to miles, feet to meters, meters to feet, inches to centimeters, centimeters to inches, pounds to kilograms, kilograms to pounds, ounces to grams, grams to ounces, gallons to liters, liters to gallons, square feet to square meters, square meters to square feet, Fahrenheit to Celsius, and Celsius to Fahrenheit.
These conversions are useful for travel, recipes, product specs, schoolwork, vehicle information, home projects, room measurements, fitness, and quick comparisons between US standard units and metric units.
The result updates immediately when you change the value or conversion type. The formula shown under the answer explains the math being used so you can double-check the conversion or repeat it by hand.
For temperature conversions, the calculator uses the standard Fahrenheit and Celsius formulas. For length, weight, and volume, it uses common exact or widely accepted conversion factors.
Reference
Common conversion factors
| Conversion | Formula | Example |
|---|---|---|
| Miles to kilometers | miles x 1.609344 | 10 miles = 16.0934 km |
| Pounds to kilograms | pounds x 0.45359237 | 150 lb = 68.0389 kg |
| Inches to centimeters | inches x 2.54 | 12 in = 30.48 cm |
| Ounces to grams | ounces x 28.349523125 | 8 oz = 226.7962 g |
| Gallons to liters | gallons x 3.785411784 | 5 gal = 18.9271 L |
| Square feet to square meters | square feet x 0.09290304 | 120 sq ft = 11.1484 sq m |
| Fahrenheit to Celsius | (F - 32) x 5 / 9 | 68 F = 20 C |
Conversion notes
Included conversions
What units can I convert?
The converter includes miles, kilometers, feet, meters, inches, centimeters, pounds, kilograms, ounces, grams, gallons, liters, square feet, square meters, Fahrenheit, and Celsius.
Can more conversions be added?
Yes. Recipe measurements, speed conversions, pressure conversions, and additional area or volume conversions can be added next.
Why do some answers have decimals?
Many unit conversions do not result in whole numbers. The calculator rounds the displayed answer to keep it readable while still showing enough detail for everyday use.