Length Converter: Inches to cm Screen Size, Nautical Miles to km Marine Distance, Feet Inches to Meters Height
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles and Chinese li/chi/cun. Pick the source and target units, type a value and see every equivalent length update instantly — swap units with one tap, copy the result, and scan the full all-units overview. Built for engineering, logistics, travel and everyday measurement.
Length conversion
Length Convert
All units overview
All Units Overview
How to Use
Length Converter Guide
Metric / Imperial / Chinese
The length converter is one of the foundational tools in FinCompute’s conversion module, covering 13 units across the metric, imperial and Chinese traditional systems. Whether you are an engineer converting millimeters to inches on a drawing, a logistics specialist checking kilometers against miles, a traveler understanding nautical miles, or encountering li, chi and cun in traditional trades, enter any value and instantly see every equivalent unit. All conversion runs locally in your browser with no network access, millisecond response, one-click copy of results and quick swap of source/target units.
01 Unit systems
The metric system (SI) is based on the meter: 1 meter = 100 centimeters = 1000 millimeters = 0.001 kilometers, with simple decimal conversions widely used in science, engineering and daily life. The imperial system includes the inch, foot, yard, mile and nautical mile: 1 foot = 12 inches, 1 yard = 3 feet, 1 mile = 1760 yards ≈ 1.609 km, and 1 nautical mile = 1852 meters (international standard). Imperial units remain common in the US, UK and marine/aviation contexts.
Chinese traditional units include the li, chi and cun: 1 li (市里) = 500 meters, 1 chi (市尺) = 1/3 meter ≈ 33.33 cm, 1 cun (市寸) = 1/30 meter ≈ 3.33 cm. Although officially replaced by metric units, they still appear in traditional trades and historical texts. The exact inch-to-centimeter conversion is 1 in = 2.54 cm by international definition.
- 1 km = 1000 m = 0.6214 mi
- 1 m = 3.2808 ft = 1.0936 yd = 3 chi
- 1 in = 2.54 cm (exact)
- 1 nmi = 1852 m (international nautical mile)
- 1 li = 500 m = 0.5 km
02 How to use
In the left (source) panel enter a value and choose the source unit; the right (target) panel instantly shows the result, and the all-units overview below lists every equivalent unit at once. Click any unit button to switch source or target, and the swap button in the middle reverses source/target in one click. The copy button copies a “X unit = Y unit” string to the clipboard for pasting into documents or chats. Click Reset in the top right to restore defaults.
Inputs and actions
- value fieldEnter the numeric amount to convert; results update instantly.
- unit buttonsTap a unit to set it as source (left) or target (right); the active pair is highlighted.
- ⇄ SwapReverses the source and target units in one click.
- CopyCopies the full “X unit = Y unit” result to the clipboard.
- ResetRestores the default source/target units and value.
Output
- target resultThe converted value in the selected target unit (read-only).
- rate tipShows the forward and reverse conversion factors (or the temperature offset note).
- all unitsLists the value converted into every available unit at once; source is green, target blue.
- The nautical mile is defined as 1852 m, an international standard independent of metric/imperial
- 1 inch = 2.54 cm is an exact definition, not an approximation
- 1 chi = 1/3 m under the current standard; historical values varied
- In the all-units list the source unit is marked green and the target unit blue for quick orientation
FinCompute’s free online length converter covers 13 units across metric, imperial and Chinese traditional systems in one screen. Whether you need inches to cm for a screen size, nautical miles to km for marine distance, or feet/inches to meters for a height conversion, type any value and see every equivalent update at once.
Metric length: millimeters, centimeters, decimeters, meters and kilometers
Metric is based on the meter; millimeters, centimeters, decimeters, meters and kilometers use decimal conversions and form the official measurement system for science, engineering and most countries. 1 meter = 100 cm = 1000 mm, and 1 kilometer = 1000 meters.
Imperial length: inches to nautical miles — screen, marine and height conversion
Imperial includes inches, feet, yards, miles and nautical miles. 1 foot = 12 inches, 1 yard = 3 feet, 1 mile = 1760 yards ≈ 1.609 km, and 1 nautical mile = 1852 m (international standard). Convert 27-inch monitor to cm, 5 ft 8 in to meters, or nautical miles to km for marine distance in one input.
Chinese traditional length: li, chi, cun to meters and centimeters
The li, chi and cun are traditional Chinese units: 1 li = 500 m, 1 chi = 1/3 m ≈ 33.33 cm, 1 cun = 1/30 m ≈ 3.33 cm. They still appear in tailor measuring, traditional trades and Chinese-language property descriptions.
Common length conversions: screens, marine, height, driving and machining
Engineers convert millimeter drawings to inches for US clients; logistics staff convert dimensions between cm and inches for shipping labels; runners convert 5K/10K distances to miles; travelers convert speed limits and hiking distances; screen sizes (phones, monitors, TVs) are quoted as diagonal inches — multiply by 2.54 to get centimeters.
Length conversion formulas: exact factors from the 1959 Yard & Pound Agreement
Inches to cm: cm = inches × 2.54 (exact by international definition). Miles to km: km = miles × 1.609344. Feet to meters: m = feet × 0.3048. Yards to meters: m = yards × 0.9144. Nautical miles to km: km = nmi × 1.852. All imperial-to-metric factors above are exact values defined by the International Yard and Pound Agreement of 1959.
Last updated: 2026-08-23
FAQ
QHow many cm in an inch?
1 inch = 2.54 cm by exact international definition, not an approximation.
QHow many km in a mile?
1 mile = 1.609344 kilometers exactly (defined in 1959).
QAre nautical miles the same as miles?
No. 1 nautical mile = 1852 m (international standard) for marine/aviation use; 1 statute mile = 1609.344 m.
QHow many chi in a meter?
1 meter = 3 chi, so 1 chi ≈ 33.33 cm and 1 cun ≈ 3.33 cm.
QHow many yards in a meter?
1 meter ≈ 1.09361 yards. To convert meters to yards, multiply by 1.09361; to convert yards to meters, multiply by 0.9144.
QHow do I convert screen size from inches to cm?
Screen sizes are measured diagonally. Multiply the inch value by 2.54. For example, a 27-inch monitor is 68.58 cm diagonally.
QHow far is a 5K run in miles?
A 5K run is 5 kilometers ≈ 3.107 miles. A 10K is 6.214 miles, and a half marathon (21.0975 km) is 13.1 miles.
QCan I copy the result?
Yes. Click the copy button next to a result to copy an “X unit = Y unit” string to the clipboard.
QHow do I convert a 27-inch screen to centimeters?
Screen sizes are measured diagonally. 27 inches × 2.54 = 68.58 cm. Use the inches field and the cm value updates instantly.
QHow many kilometers is a nautical mile?
1 nautical mile = 1.852 km exactly (1,852 meters), used for marine and aviation distance. Enter the nautical-mile value to see km, miles and all other units at once.
QHow tall is 5 feet 8 inches in meters?
5 ft 8 in = 68 inches = 172.72 cm = 1.7272 m. Enter 68 inches (or 1.7272 m) to cross-check every unit.
QHow many centimeters is one Chinese chi?
1 chi = 1/3 m ≈ 33.33 cm, and 1 cun ≈ 3.33 cm. Tailors and traditional trades still use these units; the converter includes li, chi and cun alongside metric and imperial.
QHow many cm is a 65-inch TV?
Screen sizes are measured diagonally. 65 inches × 2.54 = 165.1 cm (about 1.65 m). The visible panel is roughly 144 cm wide and 81 cm tall for a standard 16:9 set.
QHow tall is 6 feet in centimeters?
6 feet = 72 inches = 182.88 cm. Enter 6 ft (or 72 in) into the converter to see meters, chi, cun and all other units at once.