Free Online Calculators
Instant estimates for home improvement, woodworking, landscaping, and everyday projects. No sign-up, no hassle — just answers.
12 Free Calculators
Every tool includes a detailed how-to guide so you know exactly what the numbers mean.
Woodworking & Construction
Board Foot Calculator
Calculate board feet from lumber dimensions with price estimates.
Calculate NowDeck Stair Calculator
Calculate rise, run, and number of steps — IRC code-compliant.
Calculate NowDrywall Calculator
Estimate drywall sheets, joint compound, and tape for any room.
Calculate NowRoofing Calculator
Calculate roofing squares, bundles, and cost by roof pitch.
Calculate NowLandscaping & Garden
Fence Post Concrete
Find concrete bags needed for fence posts — 40lb to 80lb bags.
Calculate NowGravel Calculator
Estimate gravel for driveways by cubic yards, tons, and cost.
Calculate NowMulch Calculator
Calculate mulch coverage — compare bag vs bulk costs and save.
Calculate NowPaver Base Calculator
Find base gravel and bedding sand for paver patios and driveways.
Calculate NowRetaining Wall Calculator
Estimate blocks, base gravel, and backfill for retaining walls.
Calculate NowSoil Amendment Calculator
Mix the perfect soil with compost, peat moss, and sand ratios.
Calculate NowWhy calcplug?
Instant Results
Every calculator updates in real time as you type. No page reloads, no waiting.
Works on Mobile
All tools are responsive. Use them on the job site, at the lumberyard, or in the garden.
Built-in Guides
Every calculator comes with a detailed article explaining the math and the method.