How many miles is 1 kilometre?

1 kilometre is approximately 0.621 miles, using the exact conversion factor 1 km = 0.62137119 mi.

Does this use exact or rounded conversion factors?

Exact, internationally defined conversion factors are used throughout, results are only rounded for display.

Why convert through metres instead of a direct formula for each pair?

Routing every unit through one base unit means only one multiplier per unit needs to be stored and verified, rather than a separate formula for every possible pair, which also guarantees consistent results across all combinations.

Can I convert very small or very large lengths accurately?

Yes, the same exact multipliers apply whether you're converting millimetres for a machining tolerance or kilometres for a road trip, there's no separate "precision mode" needed.

Length Converter

Convert between metres, feet, miles, kilometres and more.

Formula v1.0.0GlobalMethodology Report an issuelength-converter-v1

How this is calculated

Converts via a common base unit (metres) using exact multipliers

About this calculator

Length units get mixed constantly in everyday life, a recipe from a UK site in centimetres, a US spec sheet in inches, a road sign in kilometres, and converting between them by hand means remembering multipliers like 0.3048 or 1.60934 and hoping you didn't misplace a decimal. This calculator converts a single value between metric units (millimetres through kilometres) and imperial/US units (inches through miles) by routing every conversion through a common base unit of metres, so any pair of units, however unrelated, still comes out exact. Enter a value and pick a "from" and "to" unit to get an instant result carried to full precision, rather than relying on rounded rules of thumb that compound errors over multiple conversions or large distances.

Worked example

10 km to miles

Result: 6.21 mi

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