US Cups to Koku (cup to koku)
1 US cup equals 0.001311532456 koku (rounded).
How to convert US cups to koku
To convert US cups to koku, multiply the number of US cups by 0.001311532456. The factor is rounded to 10 significant digits. To go the other way, multiply koku by 762.4668342 (rounded).
koku = US cups × 0.001311532456
Example: 10 US cups = 0.01311532456 koku.
Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.
About these units
US Cup (cup)
One sixteenth of a US gallon, 236.588 mL (8 US fluid ounces). The standard US recipe cup.
Cups began as household drinking vessels, not scientific units, which is why they remain the messiest measures in the kitchen. The US customary cup was defined by slicing up the gallon: half a pint, or eight US fluid ounces, about 236.6 milliliters. Unlike the larger units, nobody ever fixed it to a physical vessel, so it exists only as a fraction of the gallon.
The customary cup is not the only American cup. For nutrition labels, US regulation defines a cup as exactly 240 milliliters, a rounder figure that sits slightly above the customary size. Packaged foods therefore list a serving in the legal cup while a measuring cup from the hardware store follows the customary definition. The gap is 3.4 milliliters, which hardly matters for soup but can matter in baking. Cup measures also hide the weight of dry ingredients, since a cup of sifted flour and a cup of packed flour differ substantially, which is why much of the world prefers grams.
1 US cup = 0.2365882365 liters (exactly).
Sources: Wikipedia: Cup (unit); NIST SP 811, Appendix B.8: conversion factors for volume; 21 CFR 101.9: nutrition labeling household measures
Koku (koku)
One hundred shō, about 180.39 L. The amount of rice thought to feed one person for a year; feudal domains were ranked by their koku.
Rice decided rank in Tokugawa Japan, and the koku was the yardstick. A domain whose assessed income reached 10,000 koku could have a daimyo as its lord, and the Kaga domain, rated at about 1.025 million koku, was famous as the million-koku domain. The assessment was a notional yield, with other crops converted to their rice value, and real revenue averaged only around 40 percent of it.
One koku was commonly taken as enough rice to feed one person for a year, though a merchant house code cited in the sources allowed about 1.8 koku per man, so the rule of thumb is loose. The unit equals 10 to, 100 sho or 1,000 go, and it descends from the Chinese dan, which was about 59 litres under the Tang dynasty.
The Meiji law of 1891 fixed the sho from the old kyo-masu measuring box at 2401/1331 litre, which makes the koku about 180.39 litres, close to 5 bushels. Shipping and timber koku were different quantities. A lumber koku is about 278 litres, so the word always needs its context.
1 koku = 180.3906837 liters (approximately).
Sources: Wikipedia: Koku; Wikipedia: Kokudaka; Wikipedia: Japanese units of measurement
Related conversions
- Koku to US cups (reverse)
- US cups to liters
- US cups to milliliters
- US cups to US gallons
- US cups to US fluid ounces
- US cups to cubic meters
- US cups to cubic centimeters
- US cups to US quarts
- US cups to US pints
- US cups to US tablespoons
- US cups to US teaspoons
- US cups to metric cups
- US cups to metric tablespoons
- Liters to koku
- Milliliters to koku
- US gallons to koku
- US fluid ounces to koku
See all volume units.