How many length units does this converter support?

ToolMint's Length Converter supports 12 units: Kilometer, Meter, Centimeter, Millimeter, Micrometer, Nanometer, Mile, Yard, Foot, Inch, Nautical Mile, and Light Year.

How do I convert kilometers to miles?

Select Kilometer in the From dropdown, enter your value, and select Mile in the To dropdown. The result appears instantly. 1 kilometer = 0.621371 miles.

How many meters are in a foot?

1 foot = 0.3048 meters exactly. Conversely, 1 meter = 3.28084 feet. This is the exact international definition set in 1959.

What is a nautical mile?

A nautical mile equals exactly 1,852 meters (1.852 km). It is used in marine navigation and aviation and is based on the circumference of the Earth.

Can I convert between metric and imperial in one step?

Yes. Choose a metric unit (km, m, cm) in From and an imperial unit (mi, yd, ft, in) in To — or vice versa. The converter handles the full cross-system math directly.

Length Converter – km to Miles, Meters to Feet & More

Convert between 12 length units — metric (km, m, cm, mm, μm, nm), imperial (mi, yd, ft, in), nautical miles, and light years. Get your result instantly and see all units compared at a glance.

From

3.280839895Click to copy

1 m = 3.280839895 ft

1 m in all units

Kilometer (km)0.001

Centimeter (cm)100

Millimeter (mm)1000

Micrometer (μm)1000000

Nanometer (nm)1000000000

Mile (mi)0.0006213711922

Yard (yd)1.093613298

Foot (ft)3.280839895

Inch (in)39.37007874

Nautical Mile (nmi)0.0005399568035

Light Year (ly)1.056971e-16

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12 Units

Metric, imperial, nautical miles, and even light years.

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Instant

Results update in real time as you type.

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Private

All calculations happen locally in your browser.

Included Length Converter Tools

Single Unit Converter

Pick any two of 12 length units — from nanometers to light years — and get the exact conversion instantly with a swap button.

All-Units Comparison Table

See your value converted to all 12 units simultaneously so you can compare metric, imperial, nautical, and astronomical scales side by side.

Who Uses a Length Converter

Travel & Navigation

Convert km to miles for road trips in the US or UK, or switch between nautical miles and km when planning sea or air routes.

Construction & DIY

Convert between feet, inches, and centimeters when working with blueprints, room measurements, or imported materials with mixed unit labels.

Science & Education

Convert meters to nanometers for microscopy, or astronomical units to light years for physics homework — all scales in a single tool.

How to Convert Length Units

Enter a value

Type the length you want to convert into the input field.

Choose units

Select your source unit from the From dropdown and your target unit from the To dropdown.

Read the result

The converted value appears instantly. Click it to copy to clipboard.

See all units

Scroll to the All Conversions table to see your value expressed in every supported unit at once.

Metric vs Imperial Length Units – What You Need to Know

The world uses two primary length measurement systems that rarely agree with each other. The metric system (SI) is based on powers of ten — 1 km = 1,000 m = 100,000 cm = 1,000,000 mm — making mental math and scientific notation straightforward. The imperial system (used in the US and partially in the UK) uses irregular multipliers: 1 mile = 1,760 yards = 5,280 feet = 63,360 inches. Neither system is inherently more precise; they are simply different conventions. The key conversions most people need are: 1 km = 0.621371 miles (so a 5km run is roughly 3.1 miles), 1 meter = 3.28084 feet, and 1 inch = 2.54 cm exactly (this is the internationally agreed definition since 1959). When converting between systems the only rounding that matters is how many decimal places you need — the converter shows full precision, but for practical use 3–4 decimal places are almost always sufficient.

Nautical Miles, Light Years, and Unusual Length Units

Beyond everyday metric and imperial units, two length units frequently cause confusion: the nautical mile and the light year. A nautical mile (nmi) equals exactly 1,852 meters — it was originally defined as one arc-minute of latitude along the Earth's surface, which is why it appears in aviation and marine navigation where positions are given in degrees, minutes, and seconds. 1 nautical mile = 1.852 km = 1.15078 statute miles. Speed at sea and in the air is expressed in knots — one knot equals one nautical mile per hour. A light year, by contrast, is an astronomical distance unit: the distance light travels in one year in a vacuum, approximately 9.461 × 10¹² km (about 9.46 trillion km). It is purely a distance unit, not a time unit — a common point of confusion. For students and developers working with both human-scale and astronomical distances, this converter handles the full range from nanometers (1 nm = 10⁻⁹ m, used in semiconductor specs) to light years without switching tools.

Frequently Asked Questions

How many length units does this converter support?: ToolMint's Length Converter supports 12 units: Kilometer, Meter, Centimeter, Millimeter, Micrometer, Nanometer, Mile, Yard, Foot, Inch, Nautical Mile, and Light Year.
How do I convert kilometers to miles?: Select Kilometer in the From dropdown, enter your value, and select Mile in the To dropdown. The result appears instantly. 1 kilometer = 0.621371 miles.
How many meters are in a foot?: 1 foot = 0.3048 meters exactly. Conversely, 1 meter = 3.28084 feet. This is the exact international definition set in 1959.
What is a nautical mile?: A nautical mile equals exactly 1,852 meters (1.852 km). It is used in marine navigation and aviation and is based on the circumference of the Earth.
Can I convert between metric and imperial in one step?: Yes. Choose a metric unit (km, m, cm) in From and an imperial unit (mi, yd, ft, in) in To — or vice versa. The converter handles the full cross-system math directly.

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