Formula
dry coffee=water mass/water-to-coffee ratio.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Input recipe masses. Retained water, extraction yield and final beverage concentration are not predicted.
Example Calculation
Example inputs
- Brew water: 300 g
- Water per unit coffee: 15 g/g
300 g water at 15:1 water-to-coffee needs 20 g coffee.
Frequently asked questions
How do I use this calculator?
Enter brew water, water per unit coffee. The result updates automatically. Use Reset to restore the example values.
What method does it use?
dry coffee=water mass/water-to-coffee ratio.. Input recipe masses. Retained water, extraction yield and final beverage concentration are not predicted.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.