length · International · Modern
SI base unit of length. Its definition fixes the speed of light in vacuum at exactly 299,792,458 m/s, with the second defined from the caesium-133 hyperfine frequency.
Converter
length · Russia / Eastern Europe · Medieval–modern
arshin
approx.
- Record
- M186
- Definition quality
- Historically standardized
- Conversion mode
- multiplicative
- Calculator
- Approximately calculable
Definition
Historical Cambridge reference gives Russian arshin = 28 English inches.
Reference value
One arshin is understood to be about 0.7112 metres.
History & use
Imperial Russian length measure, especially familiar in cloth measurement.
Modern use
Retained primarily for historical, educational, or reference use rather than as a current standardized calculator unit.
Did you know?
Its 28-inch value makes it almost—but not quite—a modern yard.
Sources & evidence
Source tier Historical primary/secondary publication · confidence Moderate-High
- Source 1 — https://resolve.cambridge.org/core/services/aop-cambridge-core/content/view/FD51BF2AF5A0D94BCDB10C0EABD53A9B/9781107281899mfm_pxxiv-xxvi_CBO.pdf/observanda.pdf
- Source 2 — https://resolve.cambridge.org/core/services/aop-cambridge-core/content/view/FD51BF2AF5A0D94BCDB10C0EABD53A9B/9781107281899mfm_pxxiv-xxvi_CBO.pdf/observanda.pdf
Related measurements
length · International · Modern
1 km = 1000 m by the SI prefix kilo-.
length · International · Modern
1 cm = 0.01 m by the SI prefix centi-.
length · International · Modern
1 mm = 0.001 m by the SI prefix milli-.
inch
inlength · UK / US · Modern / historical
1 international inch = exactly 0.0254 m.
foot
ftlength · UK / US · Modern / historical
1 international foot = exactly 0.3048 m.
yard
ydlength · UK / US · Modern / historical
1 international yard = exactly 0.9144 m.
mile
milength · UK / US · Modern / historical
1 international mile = exactly 1609.344 m = 1760 yd.