Free homebrewing calculators
The everyday math of brewing beer: alcohol, gravity, yeast, carbonation, mash water and color. Free, no sign-up, in your browser. The same formulas run inside every BrewForge recipe.
Gravity & alcohol
Measure, correct and convert gravity readings.
Mash & brew day
Hit your temperatures, volumes and original gravity.
Yeast, fermentation & packaging
Pitch, ferment and carbonate on target.
Recipe & ingredients
Color, hops and units for recipe design.
Calculators in your recipes, not in ten browser tabs
In BrewForge these calculations run inside your recipe: strike temperature from your mash schedule and equipment profile, color and bitterness from your ingredients, carbonation from your packaging plan. Change one value and everything downstream updates.
- Gravity, color and IBU predicted while you design
- Strike and infusion water on your brew-day sheet
- Hydrometer readings corrected and charted automatically
All calculators as a free API
Scripts and AI assistants can use the same calculations through the free brewing calculator API: one GET request, a JSON answer, no API key.
FAQ
Questions & answers
Are the calculators really free?
Yes. All calculators on this site are free to use without an account. The same calculators are included in every BrewForge plan, including the Free plan.
Can I use metric or US units?
Yes. Most calculators let you switch between °Plato and specific gravity, °C and °F, liters and gallons, kilograms and pounds. In BrewForge your unit preferences are saved to your account.
How accurate are the results?
The calculators use established brewing formulas (for example Sean Terrill’s refractometer correction). They are estimates: your equipment, ingredients and measurements decide the final result, so measure and adjust.
Do the math once. BrewForge does it every brew.
Recipes, brew day and fermentation in one place, with these calculations built in. Free for up to 20 brews.