A curated collection of free online construction calculators for contractors, builders, and tradespeople. No downloads, no signups — just accurate tools.
| Calculator | Trade | Link |
|---|---|---|
| Concrete Calculator | General | Use Free → |
| Paint Calculator | Painting | Use Free → |
| Roof Pitch Calculator | Roofing | Use Free → |
| Drywall Calculator | Drywall | Use Free → |
| BTU Calculator | HVAC | Use Free → |
| Square Footage Calculator | All Trades | Use Free → |
| Flooring Calculator | Flooring | Use Free → |
| Insulation Calculator | Insulation | Use Free → |
| Brick Calculator | Masonry | Use Free → |
| Deck Calculator | Carpentry | Use Free → |
| Wire Size Calculator | Electrical | Use Free → |
| CFM Calculator | HVAC | Use Free → |
| Paver Calculator | Landscaping | Use Free → |
| Gravel Calculator | Landscaping | Use Free → |
| Rebar Calculator | Concrete | Use Free → |
Excel templates built for contractors:
- Contractor Invoice Template — Professional invoicing with auto-calc ($9)
- Pro Bundle — Invoice + Estimate + Job Costing + P&L ($29)
- Complete Kit — All 9 business templates ($99)
- Cost to Build a House (2026)
- How to Start a Landscaping Business
- General Contractor Salary Guide
- Contractor License Requirements by State
Built by BuiltRight Academy — free tools and business skills for tradespeople.
This resource list is CC0 (public domain). The calculators and templates are © 2026 BuiltRight Academy.