Which length units are supported?

Metric (mm, cm, m, km), US customary (inch, foot, yard, mile), and several scientific/niche units (light-year, parsec, nautical mile, furlong).

Does the converter handle feet + inches?

Yes — enter a value like 5'10" and it parses to the total inches, then converts to your target unit.

What's the exact inch-to-cm conversion?

1 inch = 2.54 cm, exactly (this was standardized internationally in 1959). All length conversions derive from this definition.

Can I bookmark a conversion?

Yes — the URL captures your input and unit selections, so you can share a pre-filled conversion.

What length unit should I use for international shipping?

Most carriers accept both metric and imperial in shipping labels but standardize on metric internally. Common practice: enter package length, width, height in inches in US (UPS, USPS, FedEx) but convert to centimeters for international shipping (DHL, customs forms, EU buyers). Conversion: 1 inch = 2.54cm. Volumetric weight calculations use cm-based formulas (length x width x height in cm / 5000 for air freight). Be precise: rounding 12 inches to '30cm' (actually 30.48cm) can affect shipping rates on borderline package sizes.

How do I convert running pace from min/km to min/mile?

1 mile = 1.609 km. To convert min/km → min/mile, multiply by 1.609. Example: 5:00/km pace → 5:00 x 1.609 = 8:02/mile. To convert min/mile → min/km, divide by 1.609. Example: 8:00/mile → 8:00 / 1.609 = 4:58/km. For quick mental math: min/km is roughly 60% of min/mile (since 1km is roughly 60% of a mile). Some sport watches let you display both simultaneously; for race planning, learn your typical paces in both units.

Unit Converters · Free tool

Length Converter

Convert length units: meters, feet, inches, miles, kilometers, yards. Fast, free, and mobile-friendly.

Updated June 2026

ValueFromTo

Result

3.28084 ft

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What it does

A free length converter supporting mm, cm, m, km, inches, feet, yards, miles, plus niche units like nautical miles, light-years, and parsecs. Precise conversions using the international standard metric-to-imperial ratios (1 inch = 2.54 cm, exactly, standardized in 1959). Updates live as you type, supports feet+inches input format (5'10" parses correctly).

Handy for DIY projects (lumber sold in feet but hardware specs in mm), travel (country-of-origin uses different units than your destination), international shopping (sizing differs by region), homework (specific units required), and engineering (cross-unit-system calculations). The full unit set covers everyday needs (mm to miles) and specialized cases (light-years for astronomy, nautical miles for marine / aviation).

Common conversions: 1 cm = 0.394 inches, 1 m = 3.28 ft, 1 km = 0.621 miles, 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 mile = 1.609 km. Quick mental math: meters × 3.28 ≈ feet, kilometers × 0.6 ≈ miles (for travel distance estimation), inches × 2.5 ≈ cm (for body measurements). For precise engineering or scientific work, always use the calculator’s exact ratios — mental approximations introduce 1-3% error which compounds in multi-step conversions. See our general unit converter for more categories.

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How to use it

Enter a value in the From field.
Pick From and To units.
Read the converted value instantly.
Swap units for the reverse conversion.

When to use this tool

Following a recipe or DIY plan that mixes US and metric measurements.
Travel — quickly understanding distance in unfamiliar units.
International online shopping where dimensions are listed in foreign units.
Homework or coursework requiring specific unit precision.

When not to use it

Currency or money — use a currency converter.
Time, weight, temperature, or volume — use the relevant category-specific converter.
Highly specialized scientific units (astronomical, physics) — use a domain-specific calculator.

Common use cases

Converting a 5'10" height to 178cm for an international form.
Translating 200m sprint distance to 656 ft for a US track.
Sizing a 24-inch monitor (61cm diagonal) to fit a metric desk space.
Checking that a 5km trail equals about 3.1 miles for fitness tracking.

Frequently asked questions

Which length units are supported?: Metric (mm, cm, m, km), US customary (inch, foot, yard, mile), and several scientific/niche units (light-year, parsec, nautical mile, furlong).
Does the converter handle feet + inches?: Yes — enter a value like 5'10" and it parses to the total inches, then converts to your target unit.
What's the exact inch-to-cm conversion?: 1 inch = 2.54 cm, exactly (this was standardized internationally in 1959). All length conversions derive from this definition.
Can I bookmark a conversion?: Yes — the URL captures your input and unit selections, so you can share a pre-filled conversion.
What length unit should I use for international shipping?: Most carriers accept both metric and imperial in shipping labels but standardize on metric internally. Common practice: enter package length, width, height in inches in US (UPS, USPS, FedEx) but convert to centimeters for international shipping (DHL, customs forms, EU buyers). Conversion: 1 inch = 2.54cm. Volumetric weight calculations use cm-based formulas (length x width x height in cm / 5000 for air freight). Be precise: rounding 12 inches to '30cm' (actually 30.48cm) can affect shipping rates on borderline package sizes.
How do I convert running pace from min/km to min/mile?: 1 mile = 1.609 km. To convert min/km → min/mile, multiply by 1.609. Example: 5:00/km pace → 5:00 x 1.609 = 8:02/mile. To convert min/mile → min/km, divide by 1.609. Example: 8:00/mile → 8:00 / 1.609 = 4:58/km. For quick mental math: min/km is roughly 60% of min/mile (since 1km is roughly 60% of a mile). Some sport watches let you display both simultaneously; for race planning, learn your typical paces in both units.

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