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Home & DIY
Reddit-sourced calculators and estimators for homeowners, renters, gardeners, and hobbyists — furnace filter sizing, LED bulb replacement, tile and wallpaper estimators, square footage, smart-thermostat savings, closing costs, rent-vs-buy, lawn mowing time, plant watering, snow day, mulch, pool / spa / aquarium volume and stocking, sewing and yarn yardage.
38 tools available
Home Improvement
Tile, wallpaper, paint prep, HVAC filter sizing, thermostat savings, square footage, LED bulb conversion, real-estate closing costs — the recurring r/HomeImprovement and r/DIY pain points.
Garden & Outdoor
Lawn mowing time, plant watering schedules, houseplant light matching, snow-day chance, mulch coverage — built from r/gardening, r/lawncare, r/houseplants, r/parenting threads.
Pool, Spa & Aquarium
Pool, hot tub, and aquarium volume plus stocking — answers the r/aquariums, r/pools, r/hot tubs recurring ‘how many gallons / how many fish’ questions.
Kitchen & Pantry
Yarn, sewing, and pantry-substitution calculators for r/knitting, r/sewing, and r/cooking — fast offline math for crafters and home cooks.
Furnace Filter Size Finder
Find the right filter dimensions and MERV rating for any furnace or return grille.
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LED Bulb Wattage Replacement
Find the LED bulb equivalent for any incandescent or halogen wattage.
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Square Footage Calculator
Compute the square footage of any room or floor plan from length and width.
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Tile & Flooring Calculator
Estimate how many tiles or boxes you need for any floor or wall.
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Wallpaper Rolls Calculator
Estimate the number of wallpaper rolls needed for any wall or room.
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Smart Thermostat Savings Estimator
See how much a programmable or smart thermostat could save on your energy bill.
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Real-Estate Closing Cost Estimator
Estimate buyer closing costs (lender + title + prepaid) for any U.S. home purchase.
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Rent vs Buy Calculator
See whether buying or renting wins over your time horizon in your market.
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Lawn Mowing Time Estimator
Estimate how long it takes to mow your lawn.
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Plant Watering Schedule Calculator
Build a watering schedule for any houseplant based on pot, light, and humidity.
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Houseplant Light Matcher
Match plants to the light your window actually gets.
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Snow Day Probability Calculator
Estimate the chance of a school closure for tomorrow's forecast.
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Mulch, Soil & Gravel Calculator
Estimate how many cubic yards / bags of mulch, soil, or gravel you need.
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Pool Volume Calculator
Compute the gallons in any pool shape (rectangle, oval, round, kidney).
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Hot Tub & Spa Volume Calculator
Estimate the gallons in any hot tub or spa.
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Aquarium Tank Volume Calculator
Compute gallons / liters for any fish tank (rectangle, bowfront, cube, cylinder).
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Aquarium Stocking Calculator
See how many inches of fish your freshwater tank can safely hold.
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Sewing Yardage Calculator
Estimate fabric yardage for sewing a garment from a pattern.
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Coffee-to-Water Ratio Calculator
Find the right coffee-to-water ratio for any brew method.
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Concrete Volume Calculator
Cubic yards (and bag counts) for slabs, footings, posts, and columns.
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Paint Coverage Calculator (DIY)
Gallons and liters for any room with coats and primer adjustment.
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Deck Boards Calculator
Board count and waste from deck dimensions, joist spacing, and board width.
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Induction Hob Wire Sizer
Pick the correct breaker and copper wire for any cooktop.
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Retaining Wall Footing Depth
Estimate the depth you need for a small garden retaining wall.
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Roof Truss Stability
Quick stability check for a small roof truss.
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Fence Material Estimator
Estimate panels, posts, and total cost for a residential fence.
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Carport Beam Span
Pick a rafter depth and beam size for a small carport or pergola.
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Top-Chord-Bearing Beam Span
Find the right wood or LVL beam for a long span.
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Interior Wall Framing
Count studs, plates, cripples, and drywall for a stick-framed wall.
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Room Paint Estimator
Estimate gallons and cost to repaint a room including primer.
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Drywall Repair Cost
Estimate the cost to patch a hole in drywall.
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Heat Pump vs Gas Furnace
Compare annual operating cost of heat pump, gas furnace, and resistance.
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AC Operating Cost
Estimate annual AC cost from SEER, tonnage, and run-hours.
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Renovation Project Estimate
Estimate total renovation cost and weekly cash flow.
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Off-Grid Solar Battery Bank
Estimate the battery bank size (Wh) for an off-grid PV system.
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Hot Tub / Spa Chemical Cost
Estimate the monthly chemical cost of running a hot tub or spa.
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Home Improvement Project ROI
Estimate the break-even and ROI of a home improvement project.
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Custom Home Build Cost
Estimate the cost to build a custom home by size, finish, and region.
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