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Home & hobby · 2 tools
Free home & hobby calculators
Calculators for hobbies at home. Work out how many gallons your aquarium really holds, how much it weighs and what heater and filter it needs, or scale a bread, pizza or sourdough recipe in baker's percentages with hydration and dough temperature handled for you.
Formulas are written out on every page, and recipes and setups can be shared with a link — no account needed.
Aquarium calculators
FishGallons · 45 pages · 6 guides
Free fish tank calculator for rectangular, bow-front, cylinder and hexagon aquariums: gallons, liters, water weight, heater size, filter flow and substrate.
Open aquarium calculators →Baker's percentage calculator
LoafCalc · 37 pages · 7 guides
Free baker's percentage calculator: build bread and pizza recipes, count levain in hydration, scale by loaves or dough balls, get water temperature and yeast swaps.
Open baker's percentage calculator →