How to use this converter
Start by selecting a category — Length, Weight, Temperature, or Volume. Then choose your "from" and "to" units using the dropdown menus. Type a value into the input field, and the result updates instantly as you type.
Use the swap button to quickly reverse the conversion direction. The quick reference table below the result shows common conversions for the selected category, so you can double-check your work or look up values without re-entering them.
Common conversion mistakes
The most frequent conversion error is confusing US and Imperial measurements. A US gallon is 3.785 liters, but an Imperial gallon (used in the UK) is 4.546 liters — a 20% difference that matters for cooking and fuel calculations.
Another common mistake is treating temperature conversions like simple multiplication. Unlike length or weight, temperature scales have different zero points. You can't just multiply to convert — you need to account for the offset (32 degrees for Fahrenheit, 273.15 for Kelvin).
Finally, watch out for the difference between fluid ounces (volume) and ounces (weight). They're not the same thing — 1 fluid ounce of water weighs about 1.04 ounces. For water it's close enough, but for denser liquids like honey or lighter ones like oil, the difference matters.
Frequently asked questions
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, 72°F = (72 - 32) × 5/9 = 22.2°C. For a quick mental estimate, subtract 30 and divide by 2 — it won't be exact, but it's close enough for everyday use.
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. This is a defined standard — 1 inch = 25.4 millimeters. To convert inches to centimeters, multiply the inch value by 2.54. To go the other way, divide centimeters by 2.54.
What is the difference between a US ton and a metric ton?
A US ton (short ton) weighs 2,000 pounds (907.2 kg), while a metric ton (tonne) weighs 1,000 kilograms (2,204.6 pounds). A metric ton is about 10% heavier than a US ton. There's also the Imperial ton (long ton) at 2,240 pounds, used mostly in shipping.
How many milliliters are in a cup?
One US cup equals approximately 236.6 milliliters. This is different from a metric cup (250 ml) or an Imperial cup (284 ml). Most American recipes use US cups, while Australian recipes often use the metric cup. Always check which standard your recipe follows.