Coffee brew ratio
Find coffee, input water or the water-to-coffee mass ratio for a brew. Drag the graph handles to change inputs and explore the result.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
How it works
- = × ; = ÷ ( ≠ Vout)
- Worked example: 20 g × 16 = 320 g; 300 g ÷ 15 = 20 g
- Supported input limits: : 1e-12 ≤ x ≤ 1,000,000,000,000; : 0 ≤ x ≤ 1,000,000,000,000; : 1e-12 ≤ x ≤ 1,000,000,000,000
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
A ratio of 16 means 16 grams of input water per gram of dry coffee. It does not mean the mass of the finished drink: grounds retain water. The calculation sets quantities, not extraction, strength or an ideal recipe for every brewing method.
Sources
- OpenStax — fraction arithmetic Sources reviewed: 2026-10-06
