Free Online Unit Converters
Every day, ordinary people bump into the same kind of problem: a recipe from an American blog calls for two cups of flour, but the kitchen scale only reads grams. A couch bought from a European store lists dimensions in centimeters, while the doorway being measured is in inches. The gas gauge on a rental car in the US says miles, yet the road signs in most of the world are in kilometers.
These small mismatches between metric and imperial units cause real headaches, and usually at the worst moment. The tools on this site are built for exactly those situations, whether you are baking, renovating, shopping online, planning a trip, or just trying to understand a spec sheet. Every converter works instantly in the browser, needs no account, and every page includes the manual math so you actually learn the conversion instead of just copying an answer.
Frequently Asked Questions
Why are US and UK gallons different?
A US gallon equals 3.785 liters, while a UK imperial gallon is 4.546 liters. The difference comes from a 1824 British standard that never reached the American colonies. Always check which gallon a recipe or fuel figure uses.
Can I use these converters for medicine doses?
No. These tools are for everyday reference only, never for medication, pharmacy, or clinical measurements. Always follow your doctor or pharmacist.
Do I need an account to use the tools?
No registration, no fees, no downloads. Everything runs in your browser and works on phones, tablets, and desktops.
Are the conversion factors exact?
Yes. Since 1959, the inch and pound have been defined exactly in metric terms (1 in = 2.54 cm, 1 lb = 0.45359237 kg), and these pages use those exact international values.