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Free Coffee Tool
Coffee to Water Ratio Calculator
Get the exact amount of coffee and water for the strength you want — no mental math, no guessing scoops.
By Michael Anderson
Last Updated: September 21, 2026
Most inconsistent coffee comes down to one thing: an inconsistent ratio. Enter how much water or coffee you're working with, pick a strength, and this calculator gives you the exact grams and milliliters to hit it — every time, no matter what pot, mug, or scoop you're using.
Calculate Your Ratio
1:16.0 · Balanced
Strong (1:15)Light (1:18)
Coffee needed
45.0 g
Water needed
720 ml (24.3 oz)
≈ Standard cups
3.0
Based on a 240ml "coffee cup" measure — most drip makers use this, not a 240ml drinking mug.
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What is a coffee-to-water ratio, and why does it matter?
A brew ratio is simply the weight of coffee grounds compared to the weight of water used to brew it, written as 1:X — so 1:16 means 1 gram of coffee for every 16 grams (roughly 16 ml) of water. It's the single biggest lever over how strong or weak your coffee tastes, independent of the beans, roast, or machine you're using.
The Specialty Coffee Association's reference ratio is 1:16 to 1:18 by weight, and that range is a solid default for drip machines and pour-over. Below 1:15 the cup tends to taste heavy or bitter for most beans; above 1:18 it starts to taste thin and watery, even if the extraction itself was done well.
Common ratios, at a glance
| Ratio | Result | Best for |
|---|---|---|
| 1:15 | Strong, bold | Dark roasts, milk-based drinks |
| 1:16 | Balanced | Everyday drip and pour-over |
| 1:17 | Lighter, brighter | Light roasts, single-origin beans |
| 1:18 | Very light, tea-like | Delicate, high-acidity beans |
Frequently Asked Questions
1:16 (about 62 grams of coffee per liter of water) is the most common starting point for drip and pour-over, and it's the SCA's reference ratio for a reason — it balances strength and clarity for most beans and roast levels.
From there, move toward 1:15 for a bolder cup or 1:17-1:18 if it tastes too strong or bitter.
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