About Brewax
Free tools for better coffee. Nothing more.
What is Brewax?
Brewax is a free collection of coffee brewing calculators built for home brewers, baristas, and anyone who takes their cup seriously. Every tool runs entirely in your browser — no account required, no data collected, no ads.
The goal is simple: give you the numbers you need to brew consistently better coffee, without the noise.
The Tools
- Brewax Brew Ratio Calculate coffee-to-water ratios for any brewing method — espresso, pour over, French press, AeroPress, cold brew, and moka pot.
- Brewax Unit Converter Convert between grams, ounces, tablespoons, teaspoons, and cups. Two-way, instant, all fields live.
- Brewax Temperature Guide Ideal water temperatures for every brewing method, displayed in both °C and °F.
- Brewax Extraction Timer Time your extraction with method-specific targets and a visual indicator — too fast, optimal, or too slow.
- Brewax Caffeine Calculator Estimate your total caffeine intake by cup count, brewing method, and cup size. Includes the FDA 400mg daily reference.
- Brewax Espresso Yield Calculate brew ratio and extraction verdict from dose and yield. Ristretto, normale, or lungo — instantly.
- Brewax Cold Brew Calculator Calculate coffee and water amounts for cold brew. Regular or concentrate, with a ready-time clock.
Affiliate Disclosure
Brewax participates in the Amazon Associates programme. Some tool pages include a single product recommendation — a piece of equipment that genuinely improves the result of that tool (a precision scale, a variable-temperature kettle, a burr grinder). These links use the brewax-20 tracking tag.
If you click a link and make a purchase, Brewax may earn a small commission at no additional cost to you. Product recommendations are based on functional merit only — not commission rates.
For full details, see the Affiliate Disclosure.