What does 1:15 mean?
It means 1 part coffee beans to 15 parts water. 20 g beans uses 300 ml water.
Kitchen
Coffee Brew Ratio Calculator
Use brew ratios such as 1:15 to quickly estimate coffee beans, water, and per-cup amounts.
Updated: May 15, 2026
Input
Calculate coffee beans, water, ratio, and per-cup amounts for brewing.
This simple version does not estimate brewed yield, bloom water, or method-specific recommendations.
Result
20g
Coffee beans
300ml
Water
1:15
Ratio
2
Cups
10g
Beans per cup
150ml
Water per cup
Use this as a guide and adjust for your real conditions.
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How to use
- Choose Beans, Water, or Cups mode.
- Enter ratio, cups, and ml per cup.
- Coffee beans, water, and per-cup amounts appear on the right.
Useful tips
- Useful when you want to brew two cups at 1:15; adjust inputs to compare outcomes.
- Useful when you want to find beans needed for 300 ml water; adjust inputs to compare outcomes.
- Prefer product labels, recipe notes, and equipment markings when available.
- When unsure, start with a smaller or shorter estimate and adjust from the actual result.
Formula
Water ml = beans g × ratio. Beans g = water ml ÷ ratio. In cups mode, water ml = cups × ml per cup.
Notes
- This tool does not estimate brewed yield, bloom water, or method-specific recommendations.
- Beans, grind, water temperature, and equipment change taste.
- Use results as a starting ratio and adjust to preference.
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FAQ
Does it show brewed coffee yield?
No. This tool calculates input beans and water only. Brewed yield changes with equipment and bean absorption.
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