Free tools for DIYers & contractors
Measure
twice.
Buy once.
Straightforward calculators for the projects that actually happen on a Saturday. Pick a tool, punch in numbers, get the answer. No signups, no email walls.
- TOOL_01
Paint
Gallons per room
350sq ft / gal
Walls, doors, windows, coats, ceiling — get gallons and that awkward extra quart.
Calculate paint → - TOOL_02
Mulch
Bags or bulk yards
27cu ft / yd
Beds by size or square footage, 1–4 inch depth, bags vs skid-steer scoops.
Calculate mulch → - TOOL_03
Concrete
Yards for the pour
0.6cu ft / 80 lb bag
Slabs, footings, post holes. Ready-mix yards with waste, or bagged counts.
Calculate concrete → - TOOL_04
Tile
Floors, walls & boxes
10%cut waste factor
Room dimensions, standard tile presets, box counts, and grout needed.
Calculate tile → - TOOL_05
Deck
Boards, joists & screws
16"O.C. joist spacing
5/4×6 and 2×6 boards, continuous lengths, linear footage, and screw counts.
Calculate deck → - TOOL_06
Gravel
Tons & bulk cubic yards
1.4tons / cu yd
Driveways, walkways, patio bases. Pea gravel, crushed stone #57, river rock.
Calculate gravel →
THE QUICKJOB CALC STANDARD
Why another calculator site?
Most construction calculators online are engineered to game search engines, not to help the person holding a tape measure. They bury the input fields under six paragraphs of SEO fluff, bombard you with layout-shifting video ads, and freeze when you have one bar of cellular reception in the checkout aisle.
QuickJob Calc is built the other way around: no images or web fonts to wait on, the math shown next to every answer, and one-handed controls.
Built for One-Handed Mobile Use
No accounts, no email walls, and no newsletter takeovers. Clean, high-contrast touch controls engineered so you can punch in numbers with one thumb while standing on a ladder or in the lumber aisle. Install it to your home screen and the tools keep working when the signal drops.
Shows the Math, Never Guesses
Every calculation prints its exact assumptions: 350 sq ft/gal coverage, 0.6 cu ft per 80-lb bag, 1.4 tons/yd³ bulk density. If your supplier's specs differ, you can verify and adjust with complete confidence.
Jobsite Tolerances & Waste Built In
Lumber warps, tiles chip, and subgrades dip. Tile adds a configurable 10–20% cut factor and decking 10–15%; concrete carries a built-in 10%. Every tool returns an orderable quantity—gallons, bags, tons, cubic yards, or boxes—ready for the cashier or supply desk.
Field guides
All guides →The buying decisions behind the numbers, written like a foreman explains them.
- CONCRETEBags vs ready-mix concrete
- CONCRETEConcrete per fence post
- CONCRETEConcrete for a sonotube
- LUMBER5/4×6 vs 2×6 decking
- LUMBERDeck boards by deck size
- LUMBERDeck screws per deck
- LUMBERDeck joists per deck
- TILETile boxes per room
- TILEExtra tile for waste
- TILETile count by tile size
- PAINTGallons of paint per room
- PAINTPrimer gallons per room
- GRAVELGravel for a driveway
- MULCHMulch bags per cubic yard
- MULCHMulch over old mulch
- GRAVELGravel coverage per ton
- GRAVELGravel for a trench
- GRAVELGravel yards per ton
New trade calculators shipped on a monthly cadence
Currently live with 6 essential tools (Concrete, Decking, Gravel, Mulch, Paint, Tile). Next up in active development: Paver Patios & Base, Grass Seed & Overseeding, Drywall & Framing Studs.