DIY Cost Tools
Coffee Ratio Calculator
COOKING CALCULATOR
Calculate a coffee dose from water mass and your chosen water-to-coffee ratio.
Use the units shown. All fields are required; absolute values cannot exceed one trillion. Input water is not the same as finished beverage yield because grounds retain water and brewing causes losses. Grind, roast, water, extraction, and brewing method affect taste. All quantities are mass in grams.
How to use this calculator
Replace the defaults with your measured ingredient quantities or chosen recipe assumptions. Select Calculate and read the units beside each result. Weigh ingredients when volume measurement or packing would introduce uncertainty.
Formula and explanation
Coffee mass = water mass ÷ water-to-coffee ratio
A 16:1 ratio means sixteen grams of water for each gram of dry coffee. The ratio is a starting assumption you choose, not a universal brewing rule.
Worked example
For Water mass (grams) = 500, Water-to-coffee ratio = 16, the results are Coffee dose (grams): 31.25; Input water (grams): 500; Combined input mass (grams): 531.25.
Important limitations
Input water is not the same as finished beverage yield because grounds retain water and brewing causes losses. Grind, roast, water, extraction, and brewing method affect taste. All quantities are mass in grams.
These tools calculate quantities from your assumptions; they do not establish food safety, nutrition, or recipe quality. Follow appropriate recipe and product instructions.
Frequently asked questions
Is 16:1 the same as 1:16?
This tool writes water first. Some guides write coffee first, so confirm which quantity comes first.
Can I weigh water instead of measuring its volume?
Yes. Using mass keeps the ratio definition consistent.
Can I mix measurement units?
Convert to the units beside each input first. Grams measure mass; milliliters and cups measure volume.
What happens with invalid inputs?
The previous result clears and a validation instruction appears, preventing an old result from being mistaken for a new calculation.
Review notes
Reviewed October 1, 2026. Default examples were independently checked against the displayed formulas and conversion factors. Script checks covered blank, negative, nonfinite, and excessive values. Calculations run in your browser.