Method and sources
How we calculate
- Every rule comes from the source listed below and is explained on the calculator's page.
- The calculation runs in your browser; the page shows the working with your numbers.
- Results are rounded only when they are displayed.
How we check
- Every rule has test cases with values taken from its source.
- All tests run automatically before each release; if one fails, nothing is published.
- Every number in tables and examples comes from the same code as the calculator.
Sources
| Rule | Source | Verified on |
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| Feet, inches, cubic yards and meters (R1) | NIST Handbook 44, Appendix C, General Tables of Units of Measurement | |
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| Concrete bag yields: 40, 50, 60, 80 and 90 lb (R4) | QUIKRETE Concrete Mix No. 1101, product data sheet | |
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| Post burial depth and spacing (R5, R11) | NDSU Extension, Wooden fence construction (Smith and Hellevang) | |
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| Mulch depth (R6) | Michigan State University Extension, Mulching landscape beds FAQs | |
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| Tons per cubic yard of gravel, sand, topsoil and stone (R7) | New Mexico EMNRD, Conversion factors for construction materials (from BLM Handbook H-3890-1) | |
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| Depth of landscape rock and other inorganic mulch (R6) | Utah State University Extension, Water-wise landscaping: mulch | |
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| Topsoil depth for a new lawn (R12) | Penn State Extension, Lawn establishment | |
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| Raised-bed soil depth and mix (R12) | Iowa State University Extension, Creating raised bed planters | |
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| Paint coverage per gallon (R8) | Sherwin-Williams Cashmere Interior, product data sheet (12/2024) | |
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| Shingle bundles per square (R9) | GAF Timberline HDZ, product data sheet | |
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| Extra tile for cuts and breakage (R10) | Geon Tile, Why buy 10 to 15% overage | |
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