Food & Cooking
Coffee Ratio Calculator
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How to use it
Using the coffee ratio calculator
- 01
Weigh your water
Enter the water you will pour in grams or milliliters; a kettle scale makes this trivial.
- 02
Pick a ratio
Start at 1:16. Drop toward 1:15 for immersion brewers or dark roasts; stretch to 1:18 for bright pour-overs.
- 03
Grind to the number
Grind exactly the displayed grams. If the cup tastes thin, grind finer; bitter and harsh means grind coarser.
Good to know
Why grams beat scoops
A “tablespoon of coffee” can vary 30% bean to bean depending on roast level and grind size, while a gram is a gram. Once you switch to weighing both dose and water, reproducibility problems mostly vanish; this calculator supplies the arithmetic.
Ratio is a strength dial, not a flavor dial
Changing the ratio changes extraction yield and concentration together. Too weak? Before blaming beans, check whether your grind, time or temperature is off; ratio fixes concentration, technique fixes character.
Absorbed water and bypass
Grounds hold nearly their own weight in water after brewing. That is why ratios quote total pour water; if you brew in a French press, the drinkable yield is smaller than what you poured; plan accordingly for guests.
How it's calculated
The math behind this calculator
Coffee(g) = Water(g) ÷ Ratio Cups ≈ Water(ml) ÷ 250Brew ratios compare coffee mass to water mass: 1:16 means one gram of grounds per sixteen grams of water. Because a milliliter of hot water weighs almost exactly one gram, any ml volume doubles as its gram weight. The dose divides water weight by the chosen ratio.
Assumptions & limitations
- Water weight equals water volume (1 g ≈ 1 ml).
- Ratios refer to total brew water, including what grounds absorb (~2 g per g of coffee).
- A “cup” is taken as a generous 250 ml mug, not the 150 ml coffee-industry cup.
Worked example
Brewing 500 g of water at the balanced 1:16 ratio calls for 31.25 grams of ground coffee; roughly two 250 ml mugs’ worth.
FAQ
Frequently asked questions
- Is 1:16 good for every method?
- It is a solid default for drip and pour-over. Immersion methods often taste better slightly stronger (1:15), espresso uses radically different ratios near 1:2.
- Does 500 ml of water really weigh 500 g?
- Essentially yes within typical brewing temperatures; the 1:1 assumption introduces less error than most kitchen scales.
- How much coffee for a full 12-cup machine?
- The carafe “cups” are ~150 ml each, so 12 cups ≈ 1800 ml ÷ 16 = about 112 grams. Enter 1800 above to confirm.
- Should I adjust for light roasts?
- Light roasts extract slower; many brewers tighten the grind or extend contact time before touching the ratio.
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