Miles to Kilometers conversion
Convert miles (mi) to kilometers (km). Exact factor: 1 mi = 1.609344 km. Formula km = mi × 1.609344, worked examples, and a chart. Fast and free.
Enter values to convert.
Formulas
Core equations used by this converter.
How to use
Choose mi → km or km → mi
Use the tabs to switch direction. Forward mode needs miles; reverse uses the opposite unit.
Enter the value
Type a non-negative value in the active unit field.
Convert and read the result
Use Convert or let the result update automatically.
Example conversions
Common values with formula and result.
1 mi to km
1 mi to km
5 mi to km
5 mi to km
10 mi to km
10 mi to km
26.2188 mi to km (marathon)
26.2188 mi to km (marathon)
Miles to Kilometers conversion specification
Version 1.1.0 · Engine tested
- Engine tested 4 published cases
- Named expert review Not performed
- Calculation version 1.1.0
- Definition
- Miles (mi) converts to km using a fixed linear factor. Convert miles (mi) to kilometers (km). Exact factor: 1 mi = 1.609344 km. Formula km = mi × 1.609344, worked examples, and a chart.
- What it calculates
- Value between mi and km. Switch direction with the converter tabs.
- Inputs
- Miles (mi) or reverse unit (km)
- Outputs
- Converted value in km or mi
- Formula
km = mi × 1.609344 · 1 mi = 1.609344 km- Miles to kilometers conversion table
Miles (mi) Kilometers (km) 1 mi 1.609344 km 2 mi 3.218688 km 3 mi 4.828032 km 5 mi 8.046720 km 8 mi 12.874752 km 10 mi 16.093440 km 13.1 mi 21.082406 km 20 mi 32.186880 km 26.2188 mi 42.195000 km 50 mi 80.467200 km 100 mi 160.934400 km - Assumptions
- Conversion runs locally in the browser; values are not uploaded.
- Uses the standard factor/definition for these units.
- Units
- mi → km
- km → mi
- Boundary conditions
- Empty or non-numeric input yields no valid result.
- Non-negative values are expected for physical quantities.
- Example
- 1 mi → 1.60934 km
- Validation cases
- 1 mi → 1.609344 km
- 10 mi → 16.09344 km
- 50 mi → 80.4672 km
- 100 mi → 160.9344 km
- 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 Miles to Kilometers conversion update locally in your browser.
Related tools
Frequently asked questions
Key distinctions behind the conversion.
How do you convert using Miles to Kilometers conversion?
Use 1 mi = 1.609344 km. Example: 1 mi to km → 1.609344 km.
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.