Converters
Unit Converter
Convert between length, weight, volume, area, speed and time units.
Enter a value to convert.
What is the Unit Converter?
Whether you are following an American recipe in cups, reading a car spec in horsepower-adjacent units, or converting a marathon from miles to kilometres, unit math comes up constantly. This free unit converter handles six categories — length, weight, volume, area, speed and time — with precise conversion factors, live results and a clear formula note showing exactly how the conversion was calculated.
How to use it
- Pick a category such as Length or Weight.
- Type the value you want to convert.
- Choose the From unit and the To unit from the dropdowns.
- The result appears instantly, with the conversion formula shown underneath.
Key features
- Six categories with carefully chosen everyday and technical units.
- High-precision factors (e.g. 1 inch = 2.54 cm exactly).
- Live conversion as you type — no button needed.
- Formula note like “1 kilometre = 1,000 metres” for transparency.
- Smart number formatting with thousands separators.
Real-world use cases
- Converting recipe volumes between cups, millilitres and tablespoons.
- Turning miles per hour into km/h when reading foreign car reviews.
- Converting property area between square feet, acres and marlas-scale metric units.
- Switching cooking weights between grams, ounces and pounds.
Practical tips
- For cooking, volume conversions are approximate — a US cup is 240 ml in this tool.
- When precision matters (engineering, medicine), double-check against an authoritative table.
- The formula note is handy for showing your working in homework or reports.
- Bookmark the page — this is the kind of tool you will reach for weekly.
Frequently Asked Questions
How accurate are the conversions?
They use standard international definitions for every unit, so results match authoritative conversion tables. Values are rounded to six decimal places for readability.
Why do cooking volume conversions sometimes differ from my recipe book?
Cup and spoon sizes vary by country. This tool uses the US customary cup (240 ml) and standard teaspoons/tablespoons. For baking, weighing ingredients in grams is always more reliable.
Can I convert temperature here?
Temperature needs its own formulas rather than simple multiplication, so it has a dedicated tool — try the Temperature Converter for Celsius, Fahrenheit and Kelvin.
What does the formula note mean?
It shows the exchange rate between your two chosen units, for example how many kilometres make one mile, so you can verify the math or reuse it elsewhere.
Does it work offline?
Once the page has loaded, all conversion math runs locally in your browser with no server calls, so it keeps working even with a flaky connection.