Bloom

Definition

Bloom is a small first dose of water (often ~2–3× coffee mass) left for 30–45 seconds on a pour-over or batch brew. Gas leaves, the bed settles, and later pulses wet more evenly. Fresh light roasts bloom harder. Skip it on fully degassed coffee if you want; it is a wetting step, not magic. Espresso “blooms” as crema and gas in the puck — that is a related CO₂ story, different mechanics.

Calculators that use this

• Brew ratios & dosing

  Coffee to Water Ratio Calculator

  Turn a brew ratio and coffee dose into water mass and cups for V60, Chemex, AeroPress, French press and espresso. Weigh both sides; scoops lie.

• Brew ratios & dosing

  Iced Coffee Flash Brew Calculator

  Split a target iced coffee into hot brew water and ice so the melt lands on your brew ratio. Enter dose, total beverage and ice mass.