Length Converter Calculator

Work out length converter instantly with clear inputs, formula shown and shareable results.

About Length Converter Calculator

Every length unit is defined as a multiple of the metre, so this converter works in two steps: multiply the input by the source unit's factor to reach metre, then divide by the target unit's factor. That is why any pair in the list converts correctly without needing a separate formula for each combination.

Formulas

Two-step conversion

result = value × factor(from) ÷ factor(to)

Base unit

base (metre) = value × factor(from)

Worked example

With the default values below, Length Converter Calculator returns Converted Value of 3.280840. Change any input above and every figure here is recalculated in your browser.

Inputs used

Value: 1
From unitone of Millimetre (mm), Centimetre (cm), Metre (m), Kilometre (km), Inch (in), Foot (ft), Yard (yd), Mile (mi), Nautical mile (nmi): Metre (m)
To unitone of Millimetre (mm), Centimetre (cm), Metre (m), Kilometre (km), Inch (in), Foot (ft), Yard (yd), Mile (mi), Nautical mile (nmi): Foot (ft)

Results

Converted Value: 3.280840
Result Unit: Foot (ft)
Value in metre (base): 1.000000
Multiplier Applied: 3.28083990

Step by step

1Values used
2Two-step conversion
3Base unit
4Converted Value= 3.280840
5Result Unit= Foot (ft)
6Value in metre (base)= 1.000000
7Multiplier Applied= 3.28083990

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why convert through metre instead of directly?

With 9 units there would be 72 direct pairs to maintain. Routing through metre needs only one factor per unit and gives identical results.

Does the order of the two dropdowns matter?

Yes — the first is the unit your number is already in, the second is the unit you want. Swapping them inverts the result.