Thirty-five calculators · open source
Calculators that
compute against
your inputs.
A network of single-purpose tools, each built carefully against a published reference — ACI, ADA, NREL, USDA, manufacturer datasheets — and shown with the math, citations, and edge cases visible.
All thirty-five
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Home project costs
- 01 Roof Replacement Cost Re-roof price by size, pitch, material, and tear-off.
- 02 Kitchen Remodel Cost Budget to luxury, by size, scope, and cabinet choice.
- 03 Bathroom Remodel Cost Half-bath to primary suite, with tub-to-shower conversion.
- 04 HVAC Replacement Cost Furnace, AC, heat pump, or mini-split, by efficiency tier.
- 05 Window Replacement Cost By count, frame material, glass, and install type.
- 06 Deck Cost Wood vs composite, by the square foot, plus railing and stairs.
- 07 Fence Cost By linear foot, material, height, and gates.
- 08 Flooring Cost Install price by room and material — laminate, LVP, hardwood, tile.
- 09 Siding Replacement Cost Vinyl to fiber-cement, by wall area, stories, and tear-off.
- 10 Driveway Cost Gravel, asphalt, concrete, or pavers — by the square foot.
- 11 Water Heater Cost Tank, tankless, or heat-pump — installed, with upgrade adders.
- 12 House Painting Cost Interior or exterior, by area, prep, coats, and stories.
- 13 Gutter Installation Cost By linear foot, material, guards, and stories.
- 14 Insulation Cost Batt, blown-in, or spray foam — by area and R-value.
Construction & trades
- 15 Concrete Volume Cubic yards, bags, and ready-mix for slabs, footings, and columns.
- 16 Paint Coverage Gallons of paint and primer by room, coats, and surface texture.
- 17 Drywall Sheets Sheets, screws, mud, and tape for any wall and ceiling area.
- 18 Stair Stringer Risers, treads, and stringer length — checked against IRC and IBC.
- 19 Rebar Lap Splice Tension splice length per ACI 318, with citations.
- 20 Tile Waste & Pattern Order quantity by pattern. Herringbone is not 10%.
- 21 ADA Ramp Slope Run, landings, and handrails per ADA 2010 §405.
- 22 Room BTU Load Single-room heating and cooling sizing — Manual J shortcut.
Outdoors, lawn & energy
- 23 Solar Panel Tilt Tilt, azimuth, monthly production, and seasonal-adjust payback by zip.
- 24 Solar Panel Cost System price, the 30% tax credit, annual savings, and payback.
- 25 Generator Sizing Running and starting watts by appliance → the size to buy.
- 26 Landscaping Cost Sod to full design and hardscape, by the square foot.
- 27 Grass Seed Pounds and bags by lawn size, seed type, and new vs overseed.
- 28 Gravel & Mulch Cubic yards, tons, and bags for gravel, mulch, soil, and stone.
- 29 Hive Expansion Timing Add a super, split, feed, or treat — by USDA zone and month.
Water & specialist
Latest guides
The reasoning behind the numbers
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Auto · Maintenance
How Much Car Maintenance Really Costs (by Vehicle, Age & Mileage)
What a car actually costs to keep on the road each year — by vehicle class, age, mileage, brand reliability, and your local labor market — with a low-high range and a monthly set-aside.
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Guide · Renovation Costs
Home Renovation Cost Guide 2026: What Major Projects Really Cost
A 2026 cost guide to 16 of the most common home renovation projects — roofing, kitchens, baths, HVAC, siding, solar and more — with real price ranges and a calculator for each.
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Guide · Renovation ROI
Home Improvement ROI: Which Renovations Pay Off in 2026
A 2026 cost-vs-value guide to which home improvements actually pay back at resale — and which don't. Exterior vs interior ROI, the projects to skip, with a calculator for each.
Why this site exists
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