Japanese Rice Calculator — gō, grams & water
Convert rice between gō, grams, millilitres, cooked weight and servings — with the right amount of water — in your browser.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
Enter any one amount — gō (合), grams, millilitres, cooked rice or bowls — and get all the others, plus how much water to add.
1 gō = 150 g = 180 ml uncooked → ≈330 g cooked ≈ 2.2 bowls. Water: ~1.2 × rice volume for white rice (≈216 ml per gō); musenmai needs +10–20 ml per gō; new-crop rice slightly less. All values are approximate — adjust to taste and your cooker.
About this tool
Cooking Japanese rice starts with the gō (合), and this calculator converts it every way you need: gō to grams to millilitres to cooked weight to servings, with the right amount of water for each quantity. It uses the standard equivalences — 1 gō is 150 g or 180 ml of uncooked rice, cooking water is about 1.2 times the rice by volume, and cooked rice roughly 2.2 times the dry weight. Enter any one value and the rest update instantly. No scale? No rice-cooker cup? Either way you get exact numbers. Everything is calculated locally in your browser.
Frequently asked questions
Why is Japanese rice measured in gō instead of grams or cups?
The gō is a traditional Edo-period volume unit — one tenth of a shō — standardised at 180 ml, roughly one serving of cooked rice per person. Rice cookers still use it: the lines inside the pot and the supplied measuring cup are calibrated in gō, and a rice-cooker cup is 180 ml, not the 200 ml of a general kitchen measuring cup. That mismatch is a classic source of mushy or hard rice, which is exactly what this converter helps you avoid.
Does the water amount change for musenmai (no-wash rice) or new-crop rice?
Yes, slightly. Musenmai has had the bran layer removed, so more grains fit in the same 180 ml cup and no rinse water clings to the rice — add roughly 10–15 ml extra water per gō, or use a dedicated musenmai cup. New-crop rice (shinmai), sold in autumn, holds more moisture, so reduce water a little; older rice is drier and takes a little more. This tool shows the standard 1.2x baseline — treat it as your starting point and adjust to taste.
Is anything I enter uploaded anywhere?
No. The conversion factors — 150 g and 180 ml per gō, 1.2x water by volume, the cooked-weight multiplier — are built into the page, and all the arithmetic runs as JavaScript in your browser. Nothing you type is uploaded, stored or tracked, and once the page has loaded the calculator keeps working offline, which is handy in a kitchen with a phone on flaky Wi-Fi.