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Unit Converter

Convert between units of length, mass, volume and area instantly. Pick the source and target unit and enter a value: the conversion updates live across every metric and imperial multiple.

Settings

Conversion

Official SI and imperial system factors.

Result

1 km =

1,000 m

Meter

All equivalents in length

1,000,000 mmMillimeter
100,000 cmCentimeter
39,370.07874016 inInch
3,280.83989501 ftFoot
1,093.61329834 ydYard
1,000 mMeter
1 kmKilometer
0.62137119 miMile

Popular lookups

km → mimi → kmm → ftft → mcm → inin → cmmm → inin → mmm → ydyd → mft → cmcm → ftkm → mm → kmm → cmcm → mkg → lblb → kgg → ozoz → gkg → gg → kgt → kgkg → tst → kgkg → stlb → ozoz → lbL → galgal → LmL → fl ozfl oz → mLL → mLmL → Lm³ → LL → m³cL → mLmL → cLm² → ft²ft² → m²ha → acac → haha → m²m² → hakm² → haha → km²m² → cm²cm² → m²

How to use: Units

  1. 1Pick the unit category: length, mass, volume or area.
  2. 2Choose the source and target units (or hit swap).
  3. 3Type the value: the result and the full equivalence table update instantly.

What is it for?

  • Turn recipes or plans between imperial (inches, pounds, gallons) and metric.
  • Check the size of imported products in feet, yards or fluid ounces.
  • Solve physics and chemistry exercises without memorizing factors.

Converting units without mistakes

Metric and imperial

The metric system is decimal: each unit relates to the next by powers of ten, which makes going from meters to kilometers easy. Imperial units (inches, feet, miles, pounds, ounces) use irregular factors, so a tool helps. Every imperial unit is now defined from the metric system: 1 inch is exactly 25.4 mm and 1 pound is 0.45359237 kg.

Beware of similar units

An ounce of mass (28.35 g) is not a fluid ounce (29.57 mL in the US), and the US gallon (3.785 L) is not the British imperial gallon (4.546 L). The ton also varies: the metric tonne is 1,000 kg, the US short ton 907 kg. Always check which variant the original document means.

Rounding and significant figures

Converting does not add precision: if you measured 2.5 m with a tape measure, quoting 8.202099738 ft is misleading. Round to the significant figures of your original measurement; the tool's exact result is useful for intermediate calculations.

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Frequently asked questions

Which units can I convert?+

You can convert lengths (mm, cm, m, km, inches, feet, miles), masses (mg, g, kg, t, pounds, ounces) and volumes (mL, L, m³, gallons, pints).

Are the conversions accurate?+

Yes. All conversions use the official International System and imperial factors, rounded to 6 decimal places.

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