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Length conversion

Kilometers to Miles conversion

Convert kilometers (km) to miles (mi). Exact factor: 1 mi = 1.609344 km. Formula mi = km ÷ 1.609344, worked examples, and a chart. Fast and free.

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Result
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Inputs —
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Formulas

Core equations used by this converter.

km → mimi = km × 0.62137119
Exact factor1 km = 0.62137119 mi
mi → kmkm = mi × 1.609344
iLinear conversion using factor 0.62137119. Prefer the exact factor over rounded multipliers when precision matters.

How to use

1

Choose km → mi or mi → km

Use the tabs to switch direction. Forward mode needs kilometers; reverse uses the opposite unit.

2

Enter the value

Type a non-negative value in the active unit field.

3

Convert and read the result

Use Convert or let the result update automatically.

Example conversions

Common values with formula and result.

ϟ

1 km to miles

1 km to miles

1 ÷ 1.609344 ≈ 0.6214 mi
1 ÷ 1.609344 ≈ 0.6214 mi
ϟ

5 km to miles

5 km to miles

5 ÷ 1.609344 ≈ 3.1069 mi
5 ÷ 1.609344 ≈ 3.1069 mi
ϟ

10 km to miles

10 km to miles

10 ÷ 1.609344 ≈ 6.2137 mi
10 ÷ 1.609344 ≈ 6.2137 mi
ϟ

42.195 km to miles (marathon)

42.195 km to miles (marathon)

42.195 ÷ 1.609344 ≈ 26.2188 mi
42.195 ÷ 1.609344 ≈ 26.2188 mi

Kilometers to Miles conversion specification

Version 1.1.0 · Engine tested

Calculation status
  • Engine tested 4 published cases
  • Named expert review Not performed
  • Calculation version 1.1.0

Review policy

Definition
Kilometers (km) converts to mi using a fixed linear factor. Convert kilometers (km) to miles (mi). Exact factor: 1 mi = 1.609344 km. Formula mi = km ÷ 1.609344, worked examples, and a chart.
What it calculates
Value between km and mi. Switch direction with the converter tabs.
Inputs
  • Kilometers (km) or reverse unit (mi)
Outputs
  • Converted value in mi or km
Formula
mi = km × 0.62137119 · 1 km = 0.62137119 mi
Kilometers to miles conversion table
Kilometers (km)Miles (mi)
1 km0.6214 mi
2 km1.2427 mi
5 km3.1069 mi
8 km4.9710 mi
10 km6.2137 mi
15 km9.3206 mi
20 km12.4274 mi
25 km15.5343 mi
42.195 km26.2188 mi
50 km31.0686 mi
100 km62.1371 mi
160.9344 km100.0000 mi
Assumptions
  • Conversion runs locally in the browser; values are not uploaded.
  • Uses the standard factor/definition for these units.
Units
  • km → mi
  • mi → km
Boundary conditions
  • Empty or non-numeric input yields no valid result.
  • Non-negative values are expected for physical quantities.
Example
1 km → 0.621371 mi
Validation cases
  • 1 km → 0.62137119 mi
  • 10 km → 6.2137119 mi
  • 50 km → 31.06856 mi
  • 100 km → 62.137119 mi
Sources
  • SI / international unit definitions where applicable
  • CalculatorX conversion factors (local runtime)
Calculation version
1.1.0

Background

Interpretation and common distinctions.

Use the converter tabs to switch direction when available. Results for Kilometers to Miles conversion update locally in your browser.

km Miles to kilometers › in How many feet in a mile ›

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using Kilometers to Miles conversion?

Use 1 km = 0.621371192237334 mi. Example: 1 km to miles → 1 ÷ 1.609344 ≈ 0.6214 mi.

Can I switch direction?

Use the converter tabs when available, or open the related reverse tool from Related.

Does this run online or locally?

Calculation runs locally in your browser. Values are not uploaded.

How precise are the results?

Results follow the formulas on this page. Round to the precision your use case needs.