Bloom Timer
Enter your dose (and roast age, if you know it) to get a bloom water amount and recommended bloom time.
Bloom plan
Getting the bloom right
A good bloom fully saturates the grounds without pooling or draining through before the gas has a chance to escape. Pour gently in a spiral, give it the recommended time, and look for the coffee bed to swell and bubble — that's the CO2 releasing. A bed that barely rises usually means the beans are past their peak freshness, which isn't a problem, just a sign to use the shorter bloom time.
Once the bloom finishes, move straight into your main pours — see the brew timer for a full staged schedule that starts right where the bloom leaves off.
Frequently Asked Questions
What is the bloom, exactly?
It's the first, small pour of a pour-over or drip brew — just enough water to saturate the grounds, roughly twice their weight. Freshly roasted coffee still holds carbon dioxide from roasting, and that gas needs somewhere to go before the main pours; the bloom lets it escape (you'll see the bed puff up and bubble) instead of pushing water around unevenly later.
Why does bloom time depend on days since roasting?
Coffee degasses fastest in the first few days after roasting and slows down over the following two weeks. Very fresh beans (0-3 days) hold the most CO2 and benefit from a longer bloom to fully degas; beans rested 2+ weeks have released most of their gas already, so a shorter bloom is enough.
What if I don't know my roast date?
Leave the field blank and the tool uses a reasonable 40-second default that works for most beans a week or so off roast — which is when most home-ground coffee gets used anyway.
Does bloom water count toward my total brew ratio?
Yes — the bloom is the first stage of the pour, not extra water on top. If you're using the coffee-to-water ratio calculator or the brew timer, the bloom amount is already included in the total water for your chosen ratio.
General brewing guidance — adjust bloom time to what you see in the cup, not just the clock.