Pour-Over Brew & Bloom Calculator
Turn a coffee dose and brew ratio into your total water, the bloom pour and the remaining pours for a V60, Kalita or Chemex.
How it works
Total water = dose × ratio · Bloom water = dose × bloom multiple · Remaining = total − bloom
Pour-over recipes are set by a brew ratio: grams of water per gram of coffee, most commonly between 1:15 and 1:17. The bloom is a small first pour — usually two to three times the coffee weight — that wets the grounds and lets trapped carbon dioxide escape so the rest of the water can extract evenly. After the bloom settles for 30–45 seconds you add the remaining water in one or more pours.
Worked example
With 22 g of coffee at a 1:16 ratio you need 22 × 16 = 352 g of water. A 2.5× bloom uses 22 × 2.5 = 55 g, leaving 352 − 55 = 297 g to add in your main pours.
Frequently asked questions
What is the best pour-over ratio?
A 1:16 ratio (16 g water per gram of coffee) is a reliable starting point for a V60 or Kalita. Go toward 1:15 for a stronger cup or 1:17 for a lighter, more tea-like one, then adjust to taste.
Why do I bloom the coffee first?
Fresh grounds release carbon dioxide when they meet water. The bloom pour wets everything and lets that gas escape, so the following pours saturate the bed evenly instead of channeling around gas pockets.
How much water should the bloom use?
Roughly two to three times the coffee weight is enough to wet all the grounds without draining much through. This calculator defaults to 2.5×, so 22 g of coffee blooms with about 55 g of water.
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This calculator is for educational purposes. Double-check important results before acting on them.