Acres to Se (ac to se)
1 acre equals 40.80580226 se (rounded).
How to convert acres to se
To convert acres to se, multiply the number of acres by 40.80580226. The factor is rounded to 10 significant digits. To go the other way, multiply se by 0.02450631882 (rounded).
se = acres × 40.80580226
Example: 10 acres = 408.0580226 se.
About these units
Acre (ac)
43,560 square feet or exactly 4,046.8564224 m², about 40% of a hectare. Originally the area a yoke of oxen could plow in a day.
Ploughland gave the acre its name: it traces to Old Norse akr, meaning cultivated land, and is related to German Acker and Latin ager. In medieval England it was a farming measure, the land one man with a team of eight oxen could plough in a day. The traditional strip was 40 perches long and 4 perches wide, which is 660 by 66 feet, or ten square chains. The shape was never the point, and the article on the unit stresses that any area of 43,560 square feet is an acre.
An acre is 43,560 square feet, 4,840 square yards or 1/640 of a square mile, close to 0.4 hectare. For Americans, it is roughly 88 by 55 yards, about 90 percent of a football field without the end zones. The Weights and Measures Act 1878 fixed it at 4,840 square yards in Britain, where trade use ended in 1995. The 1959 international acre is exactly 4,046.8564224 m²; the US survey acre, about 4,046.872 m², differed slightly, and US survey units were retired after 2022.
1 acre = 4,046.856422 square meters (approximately).
Sources: Wikipedia: Acre; NIST Guide to the SI, Appendix B.8: conversion factors
Se (se)
30 tsubo, about 99.17 m².
Between the humble tsubo and the field-sized tan sits the se, a plot of 30 tsubo. In square metres that is exactly 12,000/121, or about 99.17, which is just under one are, the metric land unit of 100 square metres. A se measures roughly ten metres by ten, a small garden or a slice of a paddy.
The scale is decimal above this point. Ten se make one tan, and a hundred se make one cho, so the se works as the first step in the farmland ladder rather than a unit with a life of its own. Property listings today seldom use it, and it is mostly met in old land records and in conversion tables.
Its exact size comes from the Meiji legal definition. The 1891 law set the shaku at 10/33 metre, and the tsubo as the square of six shaku, so every larger land unit built on the tsubo inherited a fixed metric value. Before that, the shaku itself varied by era and use.
1 se = 99.17355372 square meters (approximately).
Sources: Wikipedia: Japanese units of measurement; Wikipedia: Shaku (unit); Wikipedia: Tsubo
Related conversions
- Se to acres (reverse)
- Acres to square meters
- Acres to square kilometers
- Acres to hectares
- Acres to square inches
- Acres to square feet
- Acres to square yards
- Acres to square miles
- Acres to square centimeters
- Acres to square millimeters
- Acres to tsubo
- Acres to pyeong
- Acres to rai (Thai)
- Square meters to se
- Square kilometers to se
- Hectares to se
- Square inches to se
- Square feet to se
- Square yards to se
- Square miles to se
See all area units.