Convert Yard to Kilometer
Convert yards to kilometers instantly. 1 yard = 0.0009144 kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilometer to Yard converter for the reverse conversion.
Units explained
Yard
A yard is an Imperial and US customary unit of length equal to 3 feet or exactly 0.9144 meters. It is used for medium distances, particularly in athletics and fabric/textile measurement.
The yard's origin is contested but traditionally attributed to the length from the tip of King Henry I's nose to the end of his outstretched thumb. It was standardized in English law from the medieval period and definitively fixed at 0.9144 m exactly by the 1959 International Yard and Pound Agreement.
Yards are used in American football (10 yards for a first down), golf course distances, fabric and carpet sales in the US, and short-distance running events. The UK uses yards informally and on road signs for short distances.
Standardized in English law from the Middle Ages; fixed at 0.9144 m exactly by the 1959 International Yard and Pound Agreement.
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
Yard to Kilometer conversion formula
The relationship between yards and kilometers:
To convert yards to kilometers, multiply the value in yards by 0.0009144. To reverse, multiply kilometers by 1093.6132983377.
How to use this converter
Type a value into the calculator. The result in kilometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kilometer to Yard converter for the reverse direction.
Step-by-step: convert yards to kilometers
- Write down the value in yards (yd).
- Multiply that value by the factor 0.0009144.
- The product is the equivalent value in kilometers (km).
- To reverse, multiply the kilometer value by 1093.6132983377.
Worked examples
Example 1 — Convert 1 yd to km:
1 × 0.0009144 = 0.0009144 km
Example 2 — Convert 100 yd to km:
100 × 0.0009144 = 0.09144 km
Real-world example — Metric distance scale-up
One thousand yards equals one kilometer — the running distance for a 1K race or the standard metric kilometre-scale step. The simple thousand-fold conversion is the most-used metric distance translation.
1000 yd × 0.0009144 = 0.9144 km
Real-world example — Imperial mile arithmetic
5,280 yards equals exactly one kilometer. American hikers tracking elevation gain in the smaller unit but trail length in the larger one use this constant every time they read a topographic map.
5280 yd × 0.0009144 = 4.828032 km
Real-world example — Imperial yard-to-mile scale
1,760 yards equals exactly one kilometer. American athletes and surveyors use this conversion to translate distances quoted in the smaller imperial unit into recognizable fractions of the larger geographic one.
1760 yd × 0.0009144 = 1.609344 km
Yard to Kilometer conversion table
Standard reference values for converting yards to kilometers:
| Yard [yd] | Kilometer [km] |
|---|---|
| 0.01 | 9.144e-6 |
| 0.1 | 9.144e-5 |
| 1 | 0.0009144 |
| 2 | 0.0018288 |
| 3 | 0.0027432 |
| 4 | 0.0036576 |
| 5 | 0.004572 |
| 10 | 0.009144 |
| 20 | 0.018288 |
| 30 | 0.027432 |
| 40 | 0.036576 |
| 50 | 0.04572 |
| 100 | 0.09144 |
| 500 | 0.4572 |
| 1000 | 0.9144 |
Frequently asked questions
How many kilometers is 1 yard?
How do I convert yards to kilometers?
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How many kilometers is 100 yards?
Popular length unit conversions
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 yd = 0.0009144 km) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.