Home Interior & Garage DIY Calculators
Garage floor epoxy resin kits, deck stain gallons, drywall sheets, LVP flooring boxes, and room BTU sizing.
11 free calculators
About These Calculators
Interior projects are measured in coverage, not cubic yards—which is why the calculators in this silo run in a dedicated coverage mode that speaks in gallons, boxes, sheets, and units instead of tons. A gallon of quality latex paint covers roughly 350 square feet per coat, a standard 4x8 drywall sheet covers exactly 32 square feet, most LVP flooring boxes hold 20 to 24 square feet of planks, and a two-car garage epoxy kit is sized by total floor area and concrete porosity. HVAC sizing follows its own rule of thumb—about 20 BTU per square foot before adjusting for ceiling height, insulation, sun exposure, and climate zone—which the mini-split calculator builds in step by step. Every tool here adds the waste factor contractors actually use (10% for straight flooring layouts, 15% for diagonal cuts), so the number you take to the store is the number that finishes the room, not the number that sends you back for one more box.
Garage Floor Epoxy Resin Kit, Primer & Flake Coverage Calculator
Calculate exact gallons of 100% solids epoxy vs. water-based box-store kits, moisture-vapor primer, polyaspartic topcoat, and decorative vinyl flake pounds for garage slabs.
Wood Deck Stain & Sealer Gallon Estimator (Spindles + Planks)
Estimate stain gallons for wooden deck flooring, stairs, and vertical railings.
Drywall Sheet (4x8 vs 4x12), Joint Compound & Screw Estimator
Estimate drywall sheets, joint compound buckets, and screws for interior rooms.
LVP / Laminate Flooring Box Calculator (By Sq Ft per Box)
Estimate flooring boxes with mandatory 10% diagonal/straight cut waste.
Mini-Split AC BTU Calculator (By Room Sq Ft, Ceiling & Climate)
Size your ductless mini-split AC and inverter heat pump accurately by room square footage, ceiling height, insulation quality, and US IECC Climate Zone (6k to 36k BTU).
Exterior House Paint & Primer Gallon Estimator
Estimate exterior paint gallons for wood, stucco, vinyl, or brick house exteriors.
Gutter Length & Downspout Flow Calculator
Estimate linear feet of gutters and downspout drainage requirements.
Shed Framing Lumber & Stud Calculator (Walls, Floor & Roof)
Estimate exact lumber pieces, wall studs, floor joists, and roof rafters for shed construction.
Roofing Shingle Square & Bundle Calculator (3-Tab vs Architectural)
Estimate shingle bundles, squares, and underlayment rolls for roof replacements.
Outdoor Lighting Wire & Transformer Load Calculator
Estimate low-voltage lighting transformer capacity and cable wire gauge.
Basement Waterproofing Liner & Sealant Calculator
Estimate masonry waterproofing paint and vapor barrier rolls for basement walls.