Free · Rice and grains

Rice & Water Volume Ratio Planner

Scale water volume from dry-rice volume using the retained rice presets or your own water-to-rice ratio.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

At a custom ratio of 2 cups of water per cup of dry rice, 3 cups of rice require 6 US customary cups of water, or 1,419.529419 mL.

Water volume = dry-rice volume × water-to-rice volume ratio

Worked example

Enter these known values and leave the other values blank.

Rice preset or custom ratio
Set custom ratio
Water cups per cup of dry rice
2 cups of water
Dry-rice volume
3 cups
Added water volume
6 cups

Assumptions and limitations

  • The ratio is by volume, not by mass. The cup basis is the US customary cup, exactly 236.5882365 mL.
  • Rice-type presets and listed times are starting estimates from the captured model. Variety, brand, rinsing, soaking, equipment, lid fit and evaporation can change the needed water and time.
  • Use the package or appliance instructions to choose a suitable ratio. Custom mode lets you enter that ratio directly and does not supply a cooking time.
  • Amounts and ratios are positive. This is a proportional volume calculation, not a guarantee of texture or a cooking-completion test.

Common questions

Can I use a rice-cooker cup instead?

The volume ratio works with any consistently used cup, but the mL output here assumes US customary cups. Many rice-cooker cups are smaller.

Why might the preset differ from my package?

Cooking method, variety and preparation change water needs. Select custom ratio to use the instructions for your rice and equipment.

References

The US fluid ounce uses one 128th of the exact US liquid gallon, replacing the rounded captured reciprocal factor. The US customary cup uses one sixteenth of the exact US liquid gallon, replacing the rounded captured cup volume. Bookify replaces the captured rounded US gallon with the exact 3.785411784-liter definition.

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