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
14 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.
6 calculatorsBaking & Bread
Baker's percentages, hydration, levain builds, and pan sizing.
10 calculatorsHome Brewing
ABV, hydrometer correction, priming sugar, IBU, and recipe scaling.
5 calculatorsGardening & Landscaping
Soil and mulch volume, bed mixes, spacing, and materials.
11 calculators3D Printing
Filament cost, print time, resin, scaling, and pricing.
9 calculatorsHome Renovation
Paint, stain, flooring, tile, trim, and material coverage.
15 calculatorsCoffee & Home Roasting
Brew ratios, extraction, roast loss, and cost per cup.
6 calculatorsLow-Voltage Electronics & DIY
Ohm's law, LED resistors, battery runtime, and power math.
8 calculatorsHydroponics
Reservoir volume, EC and PPM, VPD, and nutrient planning.
3 calculatorsBeekeeping
Sugar syrup, swarm traps, queen timing, and honey yield.
3 calculatorsPottery & Ceramics
Clay shrinkage, wet-to-fired sizing, glaze, and cone temps.
5 calculatorsSewing, Quilting & Fabric Crafts
Fabric yardage, quilt backing, batting, binding, and curtains.
10 calculatorsCandle Making
Wax fill, fragrance load, testing, and pricing.
3 calculatorsIn the works
10 more on the roadmapMetalworking & 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