Length Conversion Chart
Quick-reference length conversion chart. The tables below compare the most common units side by side. Download the free PDF for offline and printable use.
Standards and method
Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.
Maintained by Miguel Coelho. Updated . See our editorial policy.
Printable length conversion chart
Metric, imperial and nautical lengths with a full factor matrix. Includes the exact definition, formulas, a worked example and sources. Conversion values are checked against the defining constants, and reference data is cited to its source, before the PDF is published.
Free to print, share and use in teaching materials with attribution (CC BY 4.0).
Also in these packs: Site Engineer Reference Pack, Classroom Unit Conversion Pack, Engineering Unit Conversion Chart Pack (related sheets in one PDF).
Length Conversion Table
| Unit | per 1 m | per 1 ft | per 1 in |
|---|---|---|---|
| Millimeter (mm) | 1000 mm | 304.8 mm | 25.4 mm |
| Centimeter (cm) | 100 cm | 30.48 cm | 2.54 cm |
| Meter (m) | 1 m | 0.3048 m | 0.0254 m |
| Kilometer (km) | 0.001 km | 0.0003048 km | 2.5400e-5 km |
| Inch (in) | 39.3701 in | 12 in | 1 in |
| Foot (ft) | 3.28084 ft | 1 ft | 0.0833333 ft |
| Yard (yd) | 1.09361 yd | 0.333333 yd | 0.0277778 yd |
| Mile (mi) | 0.000621371 mi | 0.000189394 mi | 1.5783e-5 mi |
| Nautical Mile (international) (NM) | 0.000539957 NM | 0.000164579 NM | 1.3715e-5 NM |
Values are calculated from the shared conversion-factor library. Exact defined relationships are preserved; displayed results are rounded only for readability.
Full length conversion chart
Metric, imperial and nautical lengths with a full factor matrix. These are the same tables as the printable PDF. For: Students, engineers, builders and travellers.
- Exact definition
- 1 in = 25.4 mm; 1 ft = 0.3048 m; 1 mi = 1.609 344 km; 1 nmi = 1852 m
- Formula
- m = ft × 0.3048; km = mi × 1.609 344
- Reverse
- ft = m ÷ 0.3048; mi = km ÷ 1.609 344
- Worked example
- 6 ft = 72 in = 1.8288 m
- Rounding
- Matrix values use 6 significant figures; tables are rounded as shown.
Conversion factor matrix
Read across: 1 unit in the left column equals the value shown in each column unit.
| 1 unit = | mm | cm | m | km | in | ft | yd | mi | nmi |
|---|---|---|---|---|---|---|---|---|---|
| 1 mm | 1 | 0.1 | 0.001 | 1 × 10⁻⁶ | 0.0393701 | 0.00328084 | 0.00109361 | 6.21371 × 10⁻⁷ | 5.39957 × 10⁻⁷ |
| 1 cm | 10 | 1 | 0.01 | 1 × 10⁻⁵ | 0.393701 | 0.0328084 | 0.0109361 | 6.21371 × 10⁻⁶ | 5.39957 × 10⁻⁶ |
| 1 m | 1,000 | 100 | 1 | 0.001 | 39.3701 | 3.28084 | 1.09361 | 6.21371 × 10⁻⁴ | 5.39957 × 10⁻⁴ |
| 1 km | 1 × 10⁶ | 100,000 | 1,000 | 1 | 39,370.1 | 3,280.84 | 1,093.61 | 0.621371 | 0.539957 |
| 1 in | 25.4 | 2.54 | 0.0254 | 2.54 × 10⁻⁵ | 1 | 0.0833333 | 0.0277778 | 1.57828 × 10⁻⁵ | 1.37149 × 10⁻⁵ |
| 1 ft | 304.8 | 30.48 | 0.3048 | 3.048 × 10⁻⁴ | 12 | 1 | 0.333333 | 1.89394 × 10⁻⁴ | 1.64579 × 10⁻⁴ |
| 1 yd | 914.4 | 91.44 | 0.9144 | 9.144 × 10⁻⁴ | 36 | 3 | 1 | 5.68182 × 10⁻⁴ | 4.93737 × 10⁻⁴ |
| 1 mi | 1.60934 × 10⁶ | 160,934 | 1,609.34 | 1.60934 | 63,360 | 5,280 | 1,760 | 1 | 0.868976 |
| 1 nmi | 1.852 × 10⁶ | 185,200 | 1,852 | 1.852 | 72,913.4 | 6,076.12 | 2,025.37 | 1.15078 | 1 |
Inches to centimetres and millimetres
| Inches (in) | Centimetres (cm) | Millimetres (mm) |
|---|---|---|
| 1 | 2.54 | 25.4 |
| 2 | 5.08 | 50.8 |
| 3 | 7.62 | 76.2 |
| 4 | 10.16 | 101.6 |
| 5 | 12.70 | 127.0 |
| 6 | 15.24 | 152.4 |
| 7 | 17.78 | 177.8 |
| 8 | 20.32 | 203.2 |
| 9 | 22.86 | 228.6 |
| 10 | 25.40 | 254.0 |
| 11 | 27.94 | 279.4 |
| 12 | 30.48 | 304.8 |
| 13 | 33.02 | 330.2 |
| 14 | 35.56 | 355.6 |
| 15 | 38.10 | 381.0 |
| 16 | 40.64 | 406.4 |
| Inches (in) | Centimetres (cm) | Millimetres (mm) |
|---|---|---|
| 17 | 43.18 | 431.8 |
| 18 | 45.72 | 457.2 |
| 19 | 48.26 | 482.6 |
| 20 | 50.80 | 508.0 |
| 21 | 53.34 | 533.4 |
| 22 | 55.88 | 558.8 |
| 23 | 58.42 | 584.2 |
| 24 | 60.96 | 609.6 |
| 25 | 63.50 | 635.0 |
| 26 | 66.04 | 660.4 |
| 27 | 68.58 | 685.8 |
| 28 | 71.12 | 711.2 |
| 29 | 73.66 | 736.6 |
| 30 | 76.20 | 762.0 |
| 31 | 78.74 | 787.4 |
| 32 | 81.28 | 812.8 |
| Inches (in) | Centimetres (cm) | Millimetres (mm) |
|---|---|---|
| 33 | 83.82 | 838.2 |
| 34 | 86.36 | 863.6 |
| 35 | 88.90 | 889.0 |
| 36 | 91.44 | 914.4 |
| 37 | 93.98 | 939.8 |
| 38 | 96.52 | 965.2 |
| 39 | 99.06 | 990.6 |
| 40 | 101.60 | 1,016.0 |
| 41 | 104.14 | 1,041.4 |
| 42 | 106.68 | 1,066.8 |
| 43 | 109.22 | 1,092.2 |
| 44 | 111.76 | 1,117.6 |
| 45 | 114.30 | 1,143.0 |
| 46 | 116.84 | 1,168.4 |
| 47 | 119.38 | 1,193.8 |
| 48 | 121.92 | 1,219.2 |
Feet to metres
| Feet (ft) | Metres (m) |
|---|---|
| 1 | 0.305 |
| 2 | 0.610 |
| 3 | 0.914 |
| 4 | 1.219 |
| 5 | 1.524 |
| 6 | 1.829 |
| 7 | 2.134 |
| 8 | 2.438 |
| 9 | 2.743 |
| 10 | 3.048 |
| 11 | 3.353 |
| 12 | 3.658 |
| 13 | 3.962 |
| 14 | 4.267 |
| 15 | 4.572 |
| 16 | 4.877 |
| 17 | 5.182 |
| 18 | 5.486 |
| 19 | 5.791 |
| 20 | 6.096 |
| Feet (ft) | Metres (m) |
|---|---|
| 21 | 6.401 |
| 22 | 6.706 |
| 23 | 7.010 |
| 24 | 7.315 |
| 25 | 7.620 |
| 26 | 7.925 |
| 27 | 8.230 |
| 28 | 8.534 |
| 29 | 8.839 |
| 30 | 9.144 |
| 31 | 9.449 |
| 32 | 9.754 |
| 33 | 10.058 |
| 34 | 10.363 |
| 35 | 10.668 |
| 36 | 10.973 |
| 37 | 11.278 |
| 38 | 11.582 |
| 39 | 11.887 |
| 40 | 12.192 |
| Feet (ft) | Metres (m) |
|---|---|
| 41 | 12.497 |
| 42 | 12.802 |
| 43 | 13.106 |
| 44 | 13.411 |
| 45 | 13.716 |
| 46 | 14.021 |
| 47 | 14.326 |
| 48 | 14.630 |
| 49 | 14.935 |
| 50 | 15.240 |
| 51 | 15.545 |
| 52 | 15.850 |
| 53 | 16.154 |
| 54 | 16.459 |
| 55 | 16.764 |
| 56 | 17.069 |
| 57 | 17.374 |
| 58 | 17.678 |
| 59 | 17.983 |
| 60 | 18.288 |
Miles to kilometres and nautical miles
| Miles (mi) | Kilometres (km) | Nautical miles (nmi) |
|---|---|---|
| 1 | 1.61 | 0.87 |
| 2 | 3.22 | 1.74 |
| 3 | 4.83 | 2.61 |
| 4 | 6.44 | 3.48 |
| 5 | 8.05 | 4.34 |
| 6 | 9.66 | 5.21 |
| 7 | 11.27 | 6.08 |
| 8 | 12.87 | 6.95 |
| 9 | 14.48 | 7.82 |
| 10 | 16.09 | 8.69 |
| 11 | 17.70 | 9.56 |
| 12 | 19.31 | 10.43 |
| 13 | 20.92 | 11.30 |
| 14 | 22.53 | 12.17 |
| 15 | 24.14 | 13.03 |
| 16 | 25.75 | 13.90 |
| 17 | 27.36 | 14.77 |
| 18 | 28.97 | 15.64 |
| 19 | 30.58 | 16.51 |
| 20 | 32.19 | 17.38 |
| 25 | 40.23 | 21.72 |
| Miles (mi) | Kilometres (km) | Nautical miles (nmi) |
|---|---|---|
| 30 | 48.28 | 26.07 |
| 35 | 56.33 | 30.41 |
| 40 | 64.37 | 34.76 |
| 45 | 72.42 | 39.10 |
| 50 | 80.47 | 43.45 |
| 55 | 88.51 | 47.79 |
| 60 | 96.56 | 52.14 |
| 65 | 104.61 | 56.48 |
| 70 | 112.65 | 60.83 |
| 75 | 120.70 | 65.17 |
| 80 | 128.75 | 69.52 |
| 85 | 136.79 | 73.86 |
| 90 | 144.84 | 78.21 |
| 95 | 152.89 | 82.55 |
| 100 | 160.93 | 86.90 |
| 150 | 241.40 | 130.35 |
| 200 | 321.87 | 173.80 |
| 250 | 402.34 | 217.24 |
| 500 | 804.67 | 434.49 |
| 1,000 | 1,609.34 | 868.98 |
Sources for this chart
Conversion values on this sheet are generated by the AllUnitConversions conversion library and automatically checked against the exact definitions above before the PDF is produced; reference tables are taken from the sources listed.
- International Yard and Pound Agreement (1959) — 1 in = 25.4 mm, 1 ft = 0.3048 m, 1 lb = 0.453 592 37 kg exactly
- NIST Special Publication 811 — Guide for the Use of the International System of Units
- BIPM SI Brochure, 9th edition — Definitions of the SI units, including the kelvin
Related Converters & Charts
Length Conversion Chart FAQs
Common questions about the length conversion chart.
What does this length conversion chart include?
It lists the most common length units side by side with their conversion factors, plus a free printable PDF you can download for offline reference.
What exact definition is this length chart based on?
1 in = 25.4 mm; 1 ft = 0.3048 m; 1 mi = 1.609 344 km; 1 nmi = 1852 m. Formula: m = ft × 0.3048; km = mi × 1.609 344. Matrix values use 6 significant figures; tables are rounded as shown.
Can I download this chart as a PDF, CSV, or JSON?
Yes. Use the Download A4 PDF or US Letter PDF buttons for a printable version, or download the same tables as CSV or JSON from the links on this page.