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Length Converter

Convert between metric, imperial, and astronomical length units (millimetre, metre, kilometre, inch, foot, yard, mile, nautical mile, ångström, light-year, AU, parsec) with NIST-grade exact factors.

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ft

Result

0.3048 m

1 ft= 0.3048 m

UnitValue
Millimeter (mm)304.8
Centimeter (cm)30.48
Meter (m)0.3048
Kilometer (km)3.048E-4
Inch (in)12
Foot (ft)1
Yard (yd)0.333333
Mile (mi)1.89394E-4
Nautical mile (nmi)1.64579E-4
Ångström (Å)3,048,000,000
Astronomical unit (AU)2.03746E-12
Light-year (ly)3.22174E-17
Parsec (pc)9.8779E-18
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Length converter. Meters to feet, cm to inches, and miles to kilometers.

A length converter changes a measurement from one unit to another by scaling it through the meter, the SI base unit for length. It covers everyday metric and imperial units plus scientific ones like the ångström and light-year, and marks which results are exact and which are rounded.

What Is a Length Converter?

1 meter is 3.28084 feet, and 1 inch is exactly 2.54 centimeters — two conversions that sit at opposite ends of how tidy length math can get. The inch, foot, and yard trace back to the meter through exact, agreed-upon factors, so 1 inch = 2.54 cm and 1 foot = 30.48 cm come out as clean finite decimals. Going the other way is messier: 1 meter = 3.28084 feet is a rounding, because the exact relationship runs from feet to meters (1 foot = 0.3048 m), and inverting an exact factor rarely lands on a neat number.
Every conversion in this tool pivots through one base unit — the meter. Each supported unit carries a single factor to the meter, so any pair is just two steps apart: scale the input up to meters, then scale back down to the target unit. Because length shares a single zero — zero of any unit is zero meters — that scaling is a straight multiplication, with no offset to add. That is why the same engine handles a kitchen measurement and an interstellar one without special cases, and why memorizing a unit's factor to the meter gives you every cross-conversion for free.
Thirteen units span three groups. The metric group covers the millimeter, centimeter, meter, and kilometer, each a power of ten apart (10 mm in a cm, 100 cm in a meter, 1,000 meters in a km). The imperial group covers the inch, foot, yard, mile, and nautical mile — where 1 mile = 1.60934 km and, in reverse, 1 kilometer = 0.621371 mile. The scientific group covers the ångström for atomic-scale lengths and the astronomical unit, light-year, and parsec for distances in space. The light-year and parsec are the only two supported units without an exact whole value in meters, so the converter labels their results as approximate; everything else it treats as exact, which lets you tell at a glance whether a figure is a definition or a rounding.

How to Use the Length Converter

Using the converter takes three steps:
1. Pick the unit you are starting from in the From menu — meter, foot, mile, or any of the thirteen units.
2. Pick the unit you want in the To menu.
3. Type your value. The result updates as you type, and you can click it to copy.
Pick any two units you like; the converter defaults to common everyday units, and either menu switches to any unit in the list at any time. A precision selector lets you keep the auto setting (about six significant figures) or fix the number of decimals, and results outside a roughly trillion-to-thousandth range switch to scientific notation, so an ångström-to-light-year answer stays readable.
To run a conversion by hand, scale through the meter. Take meters to feet: 1 meter = 3.28084 feet, so 5 meters is 5 × 3.28084 = 16.4042 feet. For centimeters to inches, divide by 2.54, since 1 inch = 2.54 cm exactly — so 30 cm is 30 ÷ 2.54 = 11.811 inches. Miles and kilometers work the same way: 1 mile = 1.60934 km, so 10 miles is 16.0934 km. The converter flags light-year and parsec results as approximate and treats the rest as exact, so you can always tell a rounded figure from a defined one.
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The Length Conversion Formula

Lt=Ls×fs÷ftL_t = L_s × f_s ÷ f_t
  • LsL_s = The length you start from, in the source unit
  • fsf_s = Meters in one source unit — its factor to the meter (0.3048 for a foot, 0.0254 for an inch)
  • ftf_t = Meters in one target unit — its factor to the meter
  • LtL_t = The converted length, in the target unit
Every length conversion is a single multiplication, because all length units share the same zero: zero of anything is zero meters. Give each unit one number — how many meters it equals — and any pair of units is two scalings apart. Scale the input up to meters with the source factor, then scale back down with the target factor.
The metric factors are powers of ten: 1 mm = 0.001 m, 1 cm = 0.01 m, 1 km = 1000 m. The imperial factors are fixed by international agreement, and every one is exact: 1 inch = 0.0254 m, 1 foot = 0.3048 m, 1 yard = 0.9144 m, 1 mile = 1609.344 m, and 1 nautical mile = 1852 m. So feet to meters is a multiply by 0.3048, and meters to feet is the reverse — divide by 0.3048, which is the same as multiplying by 3.28084. Centimeters to inches divides by 2.54; inches to centimeters multiplies by it.
Because the imperial factors are exact definitions, the only rounding in a metric-imperial conversion is in the decimals you choose to display. The familiar 3.28084 ft, 39.3701 in, 0.621371 mi and 1.60934 km are the rounded faces of factors that are themselves exact — so if you need more digits, the converter can show them without ever changing the underlying definition.

Common Length Conversions

ConversionResultExact?
1 meter3.28084 feetrounded
1 meter39.3701 inchesrounded
1 foot30.48 cmexact
1 inch2.54 cmexact
1 yard0.9144 mexact
1 mile1.60934 kmrounded
1 kilometer0.621371 milerounded
1 nautical mile1852 mexact
10 meters32.8084 feetrounded
100 meters328.084 feetrounded
5 miles8.0467 kmrounded
10 kilometers6.21371 milesrounded
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Worked Length Conversions

Your height: 6 feet in meters

A height of 6 feet is 1.8288 m. Multiply by the exact foot factor: 6 × 0.3048 = 1.8288 m, which most people round to 1.83 m. If the height includes inches, convert the whole thing at once instead of piecing it together: 6 ft 2 in is (6 × 12 + 2) = 74 inches, and 74 × 2.54 = 187.96 cm — the single-unit route that avoids mixing factors.

Metric to imperial: 5 meters in feet

5 meters is 16.4042 feet. Multiply by 3.28084: 5 × 3.28084 = 16.4042 ft. To split that into feet and inches, take the 0.4042 ft left over and multiply by 12: 0.4042 × 12 ≈ 4.85 in, so 5 m is about 16 ft 5 in. The 3.28084 factor is rounded, so carry extra decimals for long runs where the drift would show.

A road trip: 100 miles in kilometers

100 miles on a US highway is 160.934 km. Multiply by 1.60934: 100 × 1.60934 = 160.934 km. The same factor turns a 60 mph speed limit into about 96.6 km/h (60 × 1.60934 = 96.5604). These are statute miles — the road kind. A nautical mile is longer, 1852 m, so never read a road distance off a marine chart or the other way around.

A running race: 5 km in miles

A 5K run is 3.107 miles. Multiply kilometers by 0.621371: 5 × 0.621371 = 3.106855 mi, just over 3.1 miles. A 10K is double that, 6.214 miles, and a half-marathon of 21.0975 km works out to about 13.11 miles — handy for converting race distances between countries that post one in kilometers and the other in miles.

A TV screen: 55 inches in centimeters

A 55-inch TV measures 139.7 cm across the diagonal. Multiply by the exact 2.54: 55 × 2.54 = 139.7 cm, or 1.397 m. Because 2.54 is an exact definition, the result is exact too — useful when you are checking that a screen fits the width of a cabinet or a stretch of wall before you buy it.

The gridiron: 100 yards in meters

An American football field is 100 yards between the goal lines, which is exactly 91.44 m. Multiply by the yard factor: 100 × 0.9144 = 91.44 m. Add the two 10-yard end zones and the full 120 yards is 109.728 m. The 0.9144 factor is exact (a yard is defined as 0.9144 m), so every figure here is exact rather than rounded.

Common Length Conversion Mistakes

  • Treating a mile and a nautical mile as the same distance. A statute mile is 1.60934 km, but a nautical mile is 1852 m — about 15% longer. Charts for aviation and shipping use nautical miles because one is very nearly a minute of latitude, so a marine distance read as statute miles comes out badly short.
  • Forgetting that a foot is 12 inches, not 10. Feet and inches are not base-10. To turn 5 feet 9 inches into a single number of inches, compute 5 × 12 + 9 = 69 inches, then convert once — 69 × 2.54 = 175.26 cm. Splitting a height into feet and inches and converting each part with the wrong factor is a classic slip.
  • Rounding 1 inch to 2.5 cm. One inch is exactly 2.54 cm, not 2.5. The half-millimeter you drop looks harmless on a single measurement, but over a 100-inch run it adds up to 4 cm of drift. Keep the full 2.54 whenever the result feeds into a cut, a print size, or a spec.
  • Mixing metric and imperial inside one measurement. Settle on a single unit before you add or compare. Adding 1.5 m to 3 ft without converting first gives a meaningless number; since 3 ft equals 1 yard = 0.9144 m, convert first and then add to get 2.4144 m.
  • Assuming meters to feet is an exact 3.28. The clean direction is feet to meters: 1 foot is exactly 30.48 cm. Inverting it gives 1 meter = 3.28084 feet, which is already a rounding — the digits never terminate. For rough work 3.28 is fine; for anything you actually cut or build, keep more decimals or convert from feet to meters instead.
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Length Converter — Frequently Asked Questions

How many feet are in a meter?

One meter is 3.28084 feet. That figure is a rounding — the exact definition runs the other way, with 1 foot equal to 30.48 cm. For quick estimates 3.28 is close enough; for measured work, carry more decimals.

How do I convert centimeters to inches?

Divide the centimeters by 2.54, because 1 inch is exactly 2.54 cm. So 30 cm ÷ 2.54 = 11.811 inches and 100 cm ÷ 2.54 = 39.3701 inches. The 2.54 factor is exact, so the only rounding is in the decimals you keep.

How do I convert feet to meters?

Multiply the feet by 0.3048, the exact foot-to-meter factor. So 6 ft = 6 × 0.3048 = 1.8288 m and 10 ft = 3.048 m. To go back the other way, divide by 0.3048 — the same as multiplying meters by 3.28084.

How many kilometers is a mile?

One mile is 1.60934 km, and one kilometer is 0.621371 mile. To go from miles to kilometers, multiply by 1.60934; to reverse it, multiply kilometers by 0.621371.

How do I convert kilometers to miles?

Multiply the kilometers by 0.621371. So 10 km = 6.21371 miles and 100 km = 62.1371 miles. It is the reciprocal of the mile-to-kilometer factor (1 mi = 1.60934 km), so the two directions always check out against each other.

How many meters are in a mile?

A statute mile is 1609.344 meters, or 1.609344 km — exact by definition. A nautical mile is different: 1852 meters. Use the statute mile for road distances and the nautical mile only for sea and air navigation.

What is the difference between a mile and a nautical mile?

A statute mile is 1.60934 km; a nautical mile is 1852 m, roughly 15% longer. The nautical mile is tied to Earth's geometry — close to one minute of latitude — which is why ships and aircraft navigate with it while road distances stay in statute miles.

How do I convert a height like 5 ft 9 in?

Turn it into one unit first. Since a foot is 12 inches, 5 ft 9 in is 5 × 12 + 9 = 69 inches, and 69 × 2.54 = 175.26 cm, or about 1.75 m. Converting each part separately with the wrong factor is where mixed-unit heights usually go wrong.

What is 6 feet in centimeters?

6 feet is 182.88 cm, or about 1.83 m. Multiply feet by 30.48, since 1 foot = 30.48 cm exactly: 6 × 30.48 = 182.88 cm. For a height like 6 ft 2 in, convert the whole thing as 74 inches × 2.54 = 187.96 cm.

Is 1 inch exactly 2.54 cm?

Yes. One inch is defined as exactly 2.54 cm, a finite decimal with no rounding. It is the cleanest imperial-to-metric relationship, which is why 1 foot works out to exactly 30.48 cm and 1 yard to exactly 0.9144 m.

What is 100 meters in feet?

100 meters is 328.084 feet. Multiply any length in meters by 3.28084 to get feet, so 10 m is 32.8084 ft and 100 m is 328.084 ft. Because 3.28084 is a rounded factor, longer distances carry a slightly larger rounding — raise the precision for exact-critical work.

How far is a 5K in miles?

A 5K race is 5 km, which is 3.107 miles — multiply kilometers by 0.621371 (5 × 0.621371 = 3.106855). A 10K is 6.214 miles, and a half-marathon of 21.0975 km is about 13.11 miles.

What is a good way to estimate metric to imperial in my head?

For a rough meters-to-feet estimate, multiply by 3.3; for kilometers to miles, multiply by 0.6 (about five-eighths). So 10 km ≈ 6 mi and 5 m ≈ 16.5 ft — close enough for casual talk, but switch to the full factors (3.28084 and 0.621371) when the number has to be right.

What are the ångström, light-year, and parsec used for?

They cover the extremes of scale. The ångström (one ten-billionth of a meter) measures atoms and light wavelengths; the light-year and parsec measure distances between stars. In this converter, light-year and parsec results are marked approximate because they are the only supported units without an exact meter value.

Why does the converter mark some results as approximate?

Most units in this tool have an exact value in meters, so their conversions are exact. The light-year and parsec are the two exceptions — their meter values cannot be stored exactly — so any result involving them is flagged approximate. The flag tells you the figure is rounded, not wrong.

How accurate is this length converter?

The metric and imperial factors are exact by international definition, so the only rounding is in the decimals you display — 1 inch = 2.54 cm and 1 yard = 0.9144 m come out exact, while 1 mile = 1.60934 km is shown rounded. Use the precision selector when you need more digits.

Is this length converter free?

Yes. It runs entirely in your browser with no account and no limits, covering metric, imperial, and scientific units from the millimeter to the parsec. An embeddable version is available too, so engineering, education, and science sites can host it without sending readers off-site.

Sumber dan Rujukan

  1. NIST SP 811 Appendix B.8 — Factors for units listed alphabetically (exact length factors in boldface: inch 2.54e-2, foot 3.048e-1, yard 9.144e-1, mile 1.609344e3, nautical mile 1.852e3)
  2. NIST Guide to the SI, Appendix B — Conversion factors (landing page)
  3. BIPM — SI base unit: metre (m), 2019 redefinition fixing c = 299,792,458 m/s exactly
  4. Wikipedia — International Yard and Pound Agreement (1 July 1959): yard defined as exactly 0.9144 m, foot as 0.3048 m, inch as 0.0254 m
  5. Wikipedia — Astronomical unit (IAU 2012 Resolution B2: 1 AU = 149,597,870,700 m exact)
  6. Wikipedia — Light-year (IAU definition: Julian year × c = 9,460,730,472,580,800 m exact)
  7. Wikipedia — Parsec (IAU 2015 Resolution B2: 1 pc = 648,000/π AU exact, ≈ 3.26156 light-years)

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