Unit Converters
Unit Converter
Pick a measurement, choose the from and to units, and the converter returns the result instantly using standard SI and US-customary factors.
Unit conversion
Result
0.3048
1 Feet = 0.3048 Meters
Conversions use standard SI/customary factors (e.g. 1 in = 0.0254 m). Temperature is converted through Celsius to handle its offset. A deterministic conversion, computed in your browser.
About this converter
A free unit converter for length, weight, volume, and temperature. Linear measurements convert through a base unit using exact constants — one inch is defined as 0.0254 metres, one pound as 453.59237 grams — while temperature is converted through Celsius so its offset is handled correctly. Everything runs in your browser. The factors are fixed reference values, so the same input always returns the same result; nothing is uploaded or stored.
How unit conversion actually works
Most everyday conversions are linear: every unit in a family has a fixed ratio to one shared base unit. This tool keeps metres for length, grams for weight, and litres for volume as those bases. To convert, it multiplies your value by the source unit's factor to reach the base, then divides by the target unit's factor. Converting 5 feet to metres is 5 × 0.3048, and the result is exact because the foot is defined relative to the metre.
Because the factors are definitions rather than measurements, a round trip returns to where it started. Convert kilometres to miles and back and you land on the original number. The only rounding happens on display, to six decimal places, which is well beyond the precision of any tape measure or kitchen scale.
Why temperature is the exception
Temperature scales do not share a zero point, so a single multiplier cannot convert them. Zero Celsius is 32 Fahrenheit, not zero Fahrenheit. To handle that offset the converter first turns whatever you enter into Celsius, then converts Celsius into the target scale. Fahrenheit to Celsius subtracts 32 and multiplies by five-ninths; Kelvin simply adds 273.15 to Celsius.
That two-step path is why a temperature variant page exists separately from length and weight: the maths is genuinely different, not just a different ratio. The same approach keeps the result correct whether you convert between two scales or chain through all three.
By variant
Questions
- Is the unit converter free?
- Yes. It is free, needs no account, and converts entirely in your browser, so the values you enter are never uploaded or stored.
- Which units does it support?
- Length (mm, cm, m, km, in, ft, yd, mi), weight (mg, g, kg, oz, lb, stone, metric tons), volume (ml, l, US fl oz, cups, pints, quarts, gallons), and temperature (Celsius, Fahrenheit, Kelvin).
- Are the conversion factors exact?
- The factors are the standard definitions — for example 1 inch = 0.0254 m and 1 pound = 453.59237 g — so conversions are exact apart from rounding the displayed result to six decimal places.
- Are the volume units US or imperial?
- The fluid ounce, cup, pint, quart, and gallon here are US customary units. UK imperial volumes differ (an imperial gallon is about 4.546 litres versus the US 3.785 litres), so use the litre/millilitre options for metric work.
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