Sen (Thai) (sen)
20 wa, exactly 40 meters. A traditional Thai unit of distance, rarely used now except in rural areas.
1 sen (Thai) = 40 meters (exactly).
About the sen (Thai)
Sen, a word that also means a rope or line, names a Thai distance of 20 wa. In metric terms that is 40 meters, a round figure that surveyors of the late nineteenth century found convenient for map scales.
The Royal Thai Survey Department began its cadastral survey in 1896, and its director, R. W. Giblin, noted that 40 m, or 4,000 cm, make one sen, so plans could be drawn at 1:4,000. A square with sides of one sen is the rai, which is why the sen sits at the center of the Thai land system.
Above it, 400 sen make one yot, a long travel distance of 16 km, and below it come the wa, sok and khuep. Day to day the sen has largely given way to meters and kilometers, though it survives in rural speech and in the definition of the rai.
Sources: Wikipedia: Thai units of measurement; Wikipedia: Rai (unit)
Sen (Thai) conversion chart
1 sen (Thai) expressed in every other length unit:
| Unit | 1 sen (Thai) |
|---|---|
| Meters | 40 |
| Kilometers | 0.04 |
| Centimeters | 4,000 |
| Millimeters | 40,000 |
| Inches | 1,574.80315 |
| Feet | 131.2335958 |
| Yards | 43.74453193 |
| Miles | 0.02485484769 |
| Micrometers | 40,000,000 |
| Nanometers | 40,000,000,000 |
| Nautical Miles | 0.02159827214 |
| Pixels (CSS) | 151,181.1024 |
| Light-years | 4.228003336×10⁻¹⁵ |
| Picometers | 40,000,000,000,000 |
| Femtometers | 4×10¹⁶ |
| Decimeters | 400 |
| Hectometers | 0.4 |
| Decameters | 4 |
| Thou | 1,574,803.15 |
| Points | 113,385.8268 |
| Picas | 9,448.818898 |
| Twips | 2,267,716.535 |
| Astronomical Units | 2.673834849×10⁻¹⁰ |
| Light-seconds | 1.334256381×10⁻⁷ |
| Light-minutes | 2.223760635×10⁻⁹ |
| Light-hours | 3.706267724×10⁻¹¹ |
| Parsecs | 1.296311716×10⁻¹⁵ |
| Megaparsecs | 1.296311716×10⁻²¹ |
| Angstroms | 400,000,000,000 |
| Fathoms | 21.87226597 |
| Cable Lengths | 0.2159827214 |
| Leagues | 0.00828494923 |
| Nautical Leagues | 0.007199424046 |
| Furlongs | 0.1988387815 |
| Chains | 1.988387815 |
| Rods | 7.953551261 |
| Links | 198.8387815 |
| Hands | 393.7007874 |
| Barleycorns | 4,724.409449 |
| Palms | 524.9343832 |
| Spans | 174.9781277 |
| Cubits | 87.48906387 |
| Ells | 34.99562555 |
| US Survey Feet | 131.2333333 |
| US Survey Miles | 0.02485479798 |
| Stadia | 0.2083333333 |
| Roman Inches | 1,626.01626 |
| Roman Feet | 135.1351351 |
| Roman Cubits | 90.09009009 |
| Roman Paces | 27.02702703 |
| Roman Stadia | 0.2162162162 |
| Roman Miles | 0.02702702703 |
| Roman Leagues | 0.01801801802 |
| Greek Feet | 125 |
| Royal Cubits | 76.19047619 |
| Egyptian Palms | 533.3333333 |
| Egyptian Fingers | 2,133.333333 |
| Khet | 0.7619047619 |
| Biblical Cubits | 74.07407407 |
| Sabbath Days' Journeys | 0.03703703704 |
| Sun | 1,320 |
| Shaku | 132 |
| Ken | 22 |
| Jō | 13.2 |
| Chō | 0.3666666667 |
| Ri (Japanese) | 0.01018518519 |
| Fen (Chinese) | 12,000 |
| Cun (Chinese) | 1,200 |
| Chi (Chinese) | 120 |
| Zhang (Chinese) | 12 |
| Li (Chinese) | 0.08 |
| Vershoks | 899.8875141 |
| Arshins | 56.24296963 |
| Sazhens | 18.74765654 |
| Versts | 0.03749531309 |
| Lignes | 17,731.84 |
| Pouces | 1,477.653333 |
| Pieds Du Roi | 123.1377778 |
| Toises | 20.52296296 |
| Lieues | 0.01026148148 |
| Varas | 47.85261395 |
| Leguas | 0.007177892092 |
| Wa (Thai) | 20 |
| Scandinavian Mil | 0.004 |
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