This comprehensive deck joist span chart compiles planning values for common joist sizes at typical on‑center spacing. Verify with your jurisdiction’s span tables and the exact species/grade/treatment you will install.
| Spacing | 2×6 | 2×8 | 2×10 | 2×12 |
|---|---|---|---|---|
| 12″ o.c. | ~10.5′ | ~13.5′ | ~16.5′ | ~19.5′ |
| 16″ o.c. | ~9.5′ | ~12.0′ | ~15.0′ | ~18.0′ |
| 24″ o.c. | ~8.0′ | ~10.0′ | ~12.5′ | ~15.0′ |
Downloadable PDFs and species‑specific charts are planned for a future update. For immediate planning, try the deck joist span calculator.
Downloadable Span Charts
Download a CSV version of the planning table for quick reference:
These values are for planning only. Always verify spans with official tables for your species, grade, treatment, and local load requirements.
Resources
Legal Notice & Disclaimer
Planning tool only. Results and charts on this site are simplified planning aids based on common assumptions. They are not a substitute for stamped engineering, permits, or inspections. Always confirm with local building officials and product manufacturers.
No warranties. This site is provided “as is,” without warranties of any kind. We disclaim liability for any loss or damage arising from its use.