Calculators for hobbies where the math matters
A wrong estimate here costs real money or a ruined project — a short pour, an overloaded floor, a print sold at a loss, a slab poured short. Pick your craft: each hub collects the tools that solve its numbers precisely, in your browser, free.
Available now
8 hubs liveWoodworking & Resin Art
Board feet, cut lists, joinery angles, epoxy pours, and finish coverage.
16 calculatorsFishkeeping & Aquatics
True water volume, filled weight, heaters, dosing, and maintenance.
1 calculatorBaking & Bread
Baker's percentages, hydration, levain builds, and pan sizing.
1 calculatorGardening & Landscaping
Soil and mulch volume, bed mixes, spacing, and materials.
4 calculators3D Printing
Filament cost, print time, resin, scaling, and pricing.
1 calculatorHome Renovation
Paint, stain, flooring, tile, trim, and material coverage.
15 calculatorsCoffee & Home Roasting
Brew ratios, extraction, roast loss, and cost per cup.
1 calculatorCandle Making
Wax fill, fragrance load, testing, and pricing.
1 calculatorIn the works
16 more on the roadmapHome Brewing
Recipe scaling, ABV, priming sugar, and water chemistry.
Coming soonLow-Voltage Electronics & DIY
Resistors, LED current, battery life, and power budgets.
Coming soonHydroponics
Nutrient dosing, reservoir mixing, and EC targets.
Coming soonBeekeeping
Syrup ratios, hive feed, and honey yield.
Coming soonPottery & Ceramics
Clay weight, glaze batches, and shrinkage.
Coming soonSewing, Quilting & Fabric Crafts
Yardage, seam allowance, and quilt math.
Coming soonMetalworking & Welding
Feeds and speeds, gas, filler, and material weight.
Coming soonRC, Drones & Robotics
Battery runtime, motor sizing, and gear ratios.
Coming soonCamping & Outdoors
Pack weight, water, calories, and trip planning.
Coming soonPet & Animal Care Logistics
Feed portions, enclosure size, and supply planning.
Coming soonFishing
Leader, line capacity, trolling, and catch logs.
Coming soonCycling
Gear ratios, power, tire pressure, and pacing.
Coming soonPainting, Miniatures & Scale Models
Paint mixing, scale conversion, and basing.
Coming soonHoliday Decorating & DIY Crafts
Lights, garland, vinyl yield, and budgets.
Coming soonPhotography & Videography
Exposure, depth of field, storage, and bitrate.
Coming soonTabletop Gaming & Terrain Building
Dice odds, encounters, terrain, and paint.
Coming soon