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Calculator index45 TOOLS · ALL FREE

EVERY ROW: FORMULA + SOURCE · NO SIGNUP
Showing 45 of 45 calculators

Paint + walls

3 TOOLSGUIDE →
PaintGallons by room size, openings subtracted(2(L+W)×H − openings) × coats ÷ 350 sf/galMFR DATAgallons→WallpaperRolls with pattern repeatwall area ÷ (roll sf × repeat factor)MFR DATArolls→DrywallSheets for walls and ceilingssurface area ÷ 32 sf/sheet × wasteUSG SPECsheets→

Masonry

6 TOOLSGUIDE →
ConcreteSlabs, footings, round poursL × W × depth ÷ 27 = cu yd, +10% spillACI 318cu yd · bags→MortarBags for brick, block, stonewall sf × bags per 100 sf by unit typeASTM C270bags→AsphaltTons for driveways and lotsL × W × depth × 145 lb/ft³ ÷ 2000NAPAtons→RebarGrid layout for slabs(L÷spacing+1)×W + (W÷spacing+1)×LACI 31820-ft sticks→BrickBricks + mortar by joint widthwall sf × ~6.9 bricks/sf (modular, ⅜" joint)BIA TN10bricks · bags→ChimneyFlue sizing for fireplacesflue area ≥ fireplace opening ÷ 10IRC R1003flue size→

Flooring + kitchen

8 TOOLSGUIDE →
TileTiles and boxes with cut wastearea ÷ tile sf × (1 + 10–15% waste)TCNAtiles · boxes→GroutPounds by joint dimensions(L+W)÷(L×W) × joint w × d × 1.86TCNApounds→FlooringHardwood, laminate, vinyl plankarea × (1+waste) ÷ box coverageNWFAboxes→Shower tileThree walls, floor, nicheΣ(wall areas) + floor + niche, +15% wasteTCNAsq ft · boxes→BacksplashCounter run minus outletsrun × height − outlets, +10% wasteTCNAsq ft→VanitySize with code clearanceswall span − clearances (15" CL toilet, 21" front)IRC R307vanity width→CountertopArea with island + overhang(run × 25.5" + island) ÷ 144NKBAsq ft · $→Kitchen cabinetsLinear feet by layoutΣ wall runs × $/lf by gradeNKBAlinear ft · $→

Landscaping

9 TOOLSGUIDE →
MulchBeds at any depthsf × depth(in) ÷ 324 = cu ydVOLUMEcu yd · bags→GravelDriveways and base layerssf × depth ÷ 324 × 1.4 tons/ydAGG SPECcu yd · tons→FencePosts, rails, pickets, concreteposts = L ÷ 8-ft spacing + 1; pickets = L ÷ (w+gap)IRCfull list→PaverPavers, base gravel, sandarea ÷ paver sf ×1.05; base = sf×4" ÷324ICPIpavers · yd→DeckBoards, joists, beams, fastenersboards = area÷(w×L); joists = W÷16" o.c. +1NADRA · IRCfull list→TopsoilBeds and lawn levelingsf × depth(in) ÷ 324 = cu ydVOLUMEcu yd · bags→SodSlabs, rolls, palletslawn sf ÷ slab/roll coverage, +5% cutsTPIpallets→Pool chlorineDose by volume and chemicalgal × Δppm × 0.00013 ÷ strengthCDC MAHCoz · lb→RainwaterHarvest from roof arearoof sf × rainfall(in) × 0.623 galEPAgallons→

Roofing + exterior

6 TOOLSGUIDE →
RoofingBundles by pitch and footprintfootprint × pitch factor ÷ 100 = squares ×3GAF · ARMAbundles→SidingSquares for any exteriorΣ wall areas − openings ÷ 100 = squaresVSI · MFRsquares→GutterRuns, downspouts, hangerseave lf; downspouts = 1 per 35 ft; hangers @24"SMACNAlf · pieces→Attic ventilationNFVA intake + exhaustattic sf ÷ 300, split 50/50 intake/exhaustIRC R806sq in NFVA→Snow loadLoad vs design capacitydepth × density (psf/in by snow type)ASCE 7psf→Garage doorSize, headroom, opener HPopening + headroom req; HP by door weightDASMAsize · HP→

HVAC + plumbing

4 TOOLSGUIDE →
BTUAC sizing with adjustmentssf × 20–25 BTU × sun · occupancy · kitchenACCA MAN-JBTU/hr→Heat pumpTonnage by climate zonesf × BTU/sf (zone 1–7) ÷ 12,000ACCA · DOEtons→Water heaterTank gallons or tankless GPMpeak-hour demand Σ fixture gallonsDOE · IPCgal · GPM→Drain pipeSize by DFU loadingΣ DFU → pipe size per IPC table 710.1IPC · UPCpipe dia.→

Electrical + solar

3 TOOLSGUIDE →
SolarSystem size from usagekWh/mo ÷ (30 × sun-hrs × 0.8 derate)NRELkW · panels→Wire sizeAWG with voltage dropVD = 2 × K × I × L ÷ CM, cap 3%NEC 310AWG→Extension cordGauge for any toolamps + length → AWG per ampacity tableNEC · ULAWG→

Lumber + framing

6 TOOLSGUIDE →
InsulationR-value + bags neededarea ÷ bag coverage @ target RIECC · MFRbags · R→LumberBoard feet + lineal feett × w × L ÷ 12 = BF, × qty + wasteWWPABF · lineal→StairIRC-compliant rise/runrisers = height ÷ 7¾" max; run ≥ 10"IRC R311stringer cut→Stud spacingStuds, headers, jacks, kingsL ÷ 16" o.c. + 1, + opening framingIRC R602stud count→Window sizingEgress + rough openingegress ≥ 5.7 sf clear; light ≥ 8% floorIRC R310min size · RO→ShedFull material takeoffframing + sheathing + roofing from footprintIRCfull list→

Cost guidesMATERIAL + LABOR · 2026 AVERAGES

10 GUIDES
Cost to build a deck$4.4K–11.2KCost to replace a roof$6.7K–12.5KCost to build a fence$1.9K–4.5KCost to paint a house$1.8K–4.4KCost to install flooring$3–22/sfCost to remodel a bathroom$6.6K–17.5KCost to pour concrete$4–8/sfCost to install siding$5.6K–17KCost to install solar$15K–25KCost to replace HVAC$5K–12.5K

About this index. Every calculator is free — no signup, no email capture, no usage limits. Estimates land within 5–10% for standard residential projects; formulas come from the IRC, NEC, IPC, ASHRAE, ACI, TCNA, and manufacturer data sheets, cited on each page — see our methodology. Every tool has a Copy-link button that encodes your inputs in the URL, so you can bookmark a calculation or send it to your contractor.