Conversion Calculator
Convert between hundreds of units across length, weight, temperature, volume, area, speed, and time.
Learn More About Conversion Calculator
What this conversion calculator covers
This tool helps you switch between common unit systems without memorizing formulas. It covers length, weight, temperature, volume, area, speed, and time so you can handle everyday and classroom conversions in one place.
It is especially useful when you are comparing imperial and metric measurements, checking recipes, reviewing schoolwork, or reading product specifications from another region.
Example unit conversions
A few common examples are converting 5 miles to kilometers, 72 degrees Fahrenheit to Celsius, or 2 liters to fluid ounces. The calculator applies the correct formula for the category you choose and shows the converted value instantly.
That makes it easy to compare values side by side without switching between separate tools for each measurement type.
When precision matters
Many everyday conversions are fine with rounded values, but some use cases need greater precision. Engineering, lab work, medication dosing, and some cooking applications can all depend on exact unit relationships and careful rounding.
For high-stakes situations, treat the result as a quick reference and confirm any official requirements, published standards, or safety rules before acting on the number.
Frequently Asked Questions
What unit categories are supported?
This converter supports length (miles, km, inches, cm, feet, yards), weight (lbs, kg, oz, g), temperature (Fahrenheit, Celsius, Kelvin), volume (gallons, liters, fl oz, ml), area (sq ft, sq m, acres), speed (mph, km/h, m/s), and time (hours, minutes, seconds, days, weeks).
How do I convert between temperature scales?
The formulas are: Fahrenheit to Celsius: (°F - 32) × 5/9; Celsius to Fahrenheit: °C × 9/5 + 32; Celsius to Kelvin: °C + 273.15; Kelvin to Celsius: K - 273.15. This calculator handles all three automatically.
Why are some conversions approximate?
Some imperial-to-metric conversions involve irrational numbers. For example, 1 inch = 2.54 cm exactly by definition (since 1959), but volume and weight conversions between systems often involve rounding. For scientific or engineering use, verify precision requirements.
What is the difference between volume and weight conversions?
Volume measures space (liters, gallons), while weight measures mass (kilograms, pounds). Converting between them requires knowing the density of the substance — for example, 1 liter of water weighs about 1 kg, but 1 liter of honey weighs more. For substances other than water, you need a density to convert accurately.