BrewMetrics tools

Coffee calculators

Everything you need to brew by the numbers — ratios, caffeine, and cost. Free, instant, and no sign-up.

Brewing

Coffee Brew Ratio Calculator

Enter your water and ratio to get the exact grams of coffee for a perfectly balanced cup — for any brew method.

Get the exact coffee and water for smooth cold brew — as a strong concentrate or ready-to-drink batch.

Enter your bags and mug size to get the exact water, strength, and caffeine for single-serve drip bags — and fix a weak cup instantly.

Caffeine

Add up your daily caffeine across espresso, drip, cold brew, and more — and see how it compares to the FDA limit.

See how much caffeine is still in your system at bedtime — and whether that afternoon coffee will cost you sleep.

Cost

See what your café habit really costs per year — and how much you’d save (or invest) by brewing at home.