Conversion Calculator
Length, mass, and temperature conversions.
Guide: Conversion Calculator
Convert common units for travel, cooking, and science: kilometres to miles, kilograms to pounds, and Celsius to Fahrenheit (and reverse). Pick a conversion type and enter a value. Global commerce and tourism mean most people bounce between metric and US customary units weekly—exact factors beat memorized approximations when baking temperatures or baggage allowances are on the line.
Precision and rounding
Results show several decimal places; round for display per your domain’s conventions.
Aviation and science may use additional significant figures; kitchen recipes rarely need more than one decimal in Celsius.
Exact vs rounded constants
One mile equals exactly 1.609344 kilometres by international agreement. Mass and temperature conversions use fixed definitions as well—no seasonal drift.
Common pitfalls
Do not confuse mass (kg) with weight (a force). In everyday language people say “weight” when they mean mass; this tool converts mass units.
For Fahrenheit ↔ Celsius, remember the scales align at −40° and water freezes at 0°C / 32°F under standard pressure.