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Gravel, mulch & framing calculators
Free DIY tools for yards, tons, bags, roof pitch, rafters, deck stairs, and stringers — open a calculator and start.
6
Calculators
13
Materials
3D
Roof & stairs
US
+ metric
Pick a job
Calculators
Gravel calculator
Yards, tons, density table, overage vs compaction, optional cost.
Open tool →
Mulch calculator
Buy-depth after existing mulch, bags↔bulk ledger, multi-bed.
Open tool →
Roof pitch calculator
X/12, degrees, % slope, rafter teaser, and pitch compare.
Open tool →
Rafter calculator
Common-rafter line length — geometry, not span tables.
Open tool →
Deck stair calculator
Risers, treads, Standard/Flush mount, and live Three.js stairs.
Open tool → Stair stringer calculator
Stringer length, Standard/Flush mount, IRC R311.7 table.
Open tool →Scenario guides
Quick jobs (same calculators)
Bags vs bulk mulch
Buy-depth + price ledger for the weekend order.
Pea gravel patio
Prefills pea density for a patio surface volume.
Driveway gravel depth
Depth → yards/tons for a single-car surface.
Roof pitch to degrees
X:12 ↔ ° ↔ % with a 6/12 prefill.
How long should stringers be?
Tip-to-tip length + IRC checks (42″ prefill).
Full stringer tool
IRC table, Standard/Flush, Manual mode.
What you’ll haul
Common materials
Built for the weekend job
DIY landscapers ordering bulk mulch or crushed stone, and builders laying out a common rafter or deck stair stringer before the lumber run. Planning ballparks only — stamped engineering and permits stay with the pros.
Seasonal tip
Spring and early fall are when gravel and mulch yards get slammed. Order bulk before the weekend rush; bags work for small beds but get expensive past roughly a third of a cubic yard.
FAQ
Are these free?
Yes. No signup. Ads or affiliate links may appear later to keep the site online.
Can I trust the numbers for a permit?
Use them for planning and material ballparks. Roof, rafter, and stair layouts still need local code review and, when required, an engineer.
Yards vs tons for gravel?
Volume is in cubic yards; tons depend on density. Pick a product preset or type your yard’s ticket number.