Unit Converter

How to convert a value

1. Choose a measurement type, enter a value and select From and To. Point or comma decimals are accepted without grouping. Scientific input such as 1e-3 is also supported within the stated limits.
2. Read the approximate result and its full target unit. For temperature, choose a temperature value or a temperature change. A change uses scale only; a temperature value also uses the scale's offset.
3. Swap units exchanges From and To while keeping your entered number. It does not replace the number with the result. Open Conversion details for the formula and rounding, or copy the current conversion.

Choose units with matching meaning

Linear conversion multiplies the value by its source factor and divides by its target factor. Area and volume use square and cubic factors. Celsius, Fahrenheit and kelvin temperature values need their own offset formulas.

A US liquid gallon and an Imperial gallon differ. Mass ounces differ from fluid ounces. Cups and spoons can also have different capacities: use the named US customary or explicit millilitre-capacity choice, not an assumed country default.

Decimal MB means 1,000,000 bytes; binary MiB means 1,048,576 bytes. A byte has 8 bits. Duration days mean 24 hours and weeks mean 7 days, not a change to a date or a daylight-saving clock.

Most results use up to 12 significant digits; absolute temperatures use up to 6 decimal places. All are approximate. A tiny absolute-temperature result can display about zero after rounding; temperature changes retain the significant-digit rule. The entered value is not silently rewritten.

Everyday conversion examples

12 inches is 30.48 centimetres. One pound is 453.59237 grams. One square metre is displayed as about 10.7639104167 square feet. Choose length, mass or area rather than mixing these dimensions.

One US liquid gallon is 3.785411784 litres; one Imperial gallon is 4.54609 litres. A US customary cup is 236.5882365 millilitres, while the explicit 250 mL cup is 250 millilitres.

A temperature value of 0°C converts to 32°F. A temperature change of 5°C converts to a change of 9°F, not 41°F. Absolute temperature values below 0 K, −273.15°C or −459.67°F are not accepted.

1.5 hours is 90 minutes, and 60 mph is 96.56064 km/h. One decimal MB is displayed as about 0.953674316406 MiB; the smaller numerical MiB value does not mean bytes have disappeared.

What this converter does not infer

Choose units of the same measurement type. Cups cannot be converted to grams without a material density, and months or years are not fixed durations here. Currency, fuel-economy reciprocals and compound feet-and-inches fields are outside this tool.

Conversions use the declared conventional definitions and rounded numerical results. They do not establish measurement accuracy, physical suitability or exact recordkeeping. Use the original inputs and appropriate requirements where rounding could matter.

Browser-side conversion

The converter performs arithmetic in your browser and does not intentionally upload or save these inputs. Copy uses the clipboard only when requested. Normal site services and consent settings remain separate.