Project MaterialCalculators
Estimate volume in Imperial or metric units across one or more rectangular areas. Keep waste allowances, density conversions, and bag-size assumptions 100% transparent and editable.
- Documented estimatesBuilt on visible volume formulas and editable inputs.
- Transparent assumptionsWaste, density, and bag sizes are always visible.
- Multiple materialsGravel, sand, soil, concrete, and more.
- Plan before orderingCompare the calculated quantity with supplier guidance.
QUICK SELECTOR
What material are you estimating?
Select the best calculator for your project scope
| Project Type | Recommended Tool | Outputs & Formats | Action |
|---|---|---|---|
| Driveways, walkways, patios, drainage beds, or aggregate sub-bases | Gravel Calculator | Volume (yd³ / m³) + optional weight (tons / tonnes) via customizable density | Calculate |
| Lawns, garden beds, raised planter boxes, sod prep, or soil top-ups | Topsoil Calculator | Volume, optional weight, and exact whole bag counts from your custom bag size | Calculate |
INTERACTIVE TOOLS
Start your estimate
All tools support multi-area calculations and editable waste allowances
Gravel Calculator
Measure project areas, calculate exact volume in cubic yards or metres, and convert to short tons using verified material densities.
- Support for multiple rectangular areas
- Editable waste %, depth units, and density
- Interactive cubic yards ↔ short tons converter
Topsoil Calculator
Calculate soil volume, optional estimated weight, and exact whole bag counts tailored to your stated bag size in litres or cubic feet.
- Multiple rectangular zones & variable depths
- Bag size in ft³ or L with whole bag rounding
- USDA NRCS soil bulk-density reference data
Measure before calculating
Accurate measurements lead to accurate estimates. Review our step-by-step measurement guide.
Suggested workflow
Measure footprint → calculate volume & bags → verify density & estimated weight → share summary.
Formulas & assumptions
Understand the geometric volume formulas, density references, and bulk unit conversions we use.
Units, Waste Allowance, Density & Bag Sizes Explained
Volume describes physical 3D space. Weight is an estimate derived from volume and material density. Waste allowance covers spillage, compaction, and uneven excavation borders.
Imperial Volume
27 cubic feet (ft³) = 1 cubic yard (yd³). Cubic yards are the industry standard for bulk delivery trucks, gravel supply yards, and mulch distributors.
Metric Volume
1 cubic metre (m³) = 1,000 litres (L). Ideal for metric landscaping projects. Formulexa lets you mix horizontal feet with inch depths or metres with centimetre depths seamlessly.
FORMULEXA INTEGRITY STANDARDS
Transparent Calculation Guarantees
No Sign-Up Needed
Instant access to all calculators with zero friction.
100% Private & Local
Your measurements and estimates stay in your browser.
Verified Math & Units
Audited formulas conforming to FHWA & USDA standards.
Dynamic Bag & Weight Support
Easily convert cubic yards to tons or bags with custom sizes.
FREQUENTLY ASKED QUESTIONS
Material estimate questions
Common questions on bulk ordering, settling, and waste
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Formulexa Material Estimation Suite · Reviewed August 2026