Recipes in ounces, furniture in inches, running apps in kilometers, weather in Fahrenheit — unit conversion is a constant small friction of international life and work. Engineering and science raise the stakes: a 1999 NASA Mars orbiter was lost because two teams mixed metric and imperial units.
This converter handles length, weight, temperature, volume, area, and speed with precise conversion factors. Type a value, pick the units, and read the result instantly — no mental math, no rounding surprises.
How to Use This Tool
- Pick the category: length, weight, temperature, volume, area, or speed.
- Choose the source and target units.
- Type the value — the conversion appears immediately.
- Swap the direction with one click if you need the inverse.
Frequently Asked Questions
Why is temperature conversion different from the others?
Most units convert by a simple multiplication, but temperature scales have different zero points. Celsius to Fahrenheit is °F = °C × 9/5 + 32 — a scale and an offset, which is why 0°C is 32°F, not 0°F.
Is a US gallon the same as a UK gallon?
No. A US gallon is about 3.785 liters; an imperial (UK) gallon is about 4.546 liters — 20% larger. Always check which gallon (or pint, or fluid ounce) a recipe or spec means.
How precise are the conversions?
The factors used are the internationally defined values (an inch is exactly 25.4 mm, a pound exactly 453.59237 g). Displayed results are rounded for readability, but the underlying math is exact.