Free Coffee Tool

Pour Over Ratio Calculator

Enter your coffee amount and strength — get the exact water, bloom pour, and total brew time.

By Michael Anderson
Last Updated: September 21, 2026

Pour-over rewards precision more than most brewing methods — ratio, bloom, and pour technique all show up clearly in the cup. Enter your coffee amount and preferred strength to get your water and bloom pour.

Calculate Your Pour-Over Recipe

1:16.0 · Balanced
Strong (1:15)Light (1:17)

Total water

320 ml (10.8 oz)

Bloom water

44 ml

Total brew time

2:30 – 3:30

Bloom with roughly 2x the coffee weight in water, then pour the rest in 2-3 stages.

Why the bloom matters

Fresh-roasted coffee traps carbon dioxide that was produced during roasting. When hot water first hits the grounds, that CO2 escapes rapidly — you'll see the coffee bed visibly puff up and bubble. Pouring the full amount of water immediately would push water around this escaping gas rather than through the grounds evenly.

A short bloom — roughly twice the coffee's weight in water, held for 30-45 seconds before continuing — lets most of that gas escape first, so the rest of the pour extracts more evenly. Coffee that's further past its roast date blooms less dramatically, which is normal, not a sign of a problem.

Pouring technique, step by step

  • Bloom first. Pour roughly 2x the coffee weight, then wait 30-45 seconds.
  • Pour in 2-3 stages. Add the remaining water in slow, steady pours rather than all at once, keeping the bed saturated.
  • Finish within the time window. Total brew time should land around 2:30-3:30 for most pour-over recipes — if it's running well outside that, adjust grind size next time.

Frequently Asked Questions

1:15 to 1:17 is the common range for pour-over — 1:15 makes a fuller-bodied, stronger cup, while 1:17 is lighter and more tea-like.

Most specialty coffee shops land around 1:16 as a balanced default.

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