Deck Calculator — Free Online Tool
Joists, deck boards, footings for any deck
Calculate deck boards, joists, posts, concrete footings. For any deck size + board spacing.
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Deck calculator
Calculate deck boards, joists, posts, concrete footings.
How to use this tool
- 1
Enter deck size
Length and width in feet.
- 2
Choose board width
5.5" is most common (actual width of 6" nominal).
- 3
Get material list
Boards, joists, posts, footings, screws.
Frequently Asked Questions
Joist spacing
Standard: 16" on-center. For composite or thicker decking: 12" OC. Code-compliant and stiffer.
Posts and footings
Post every 8 ft along perimeter. Concrete footing 24" deep (frost line varies by region).
Key Takeaways
- Deck Calculator is a free, browser-based calculator tool — joists, deck boards, footings for any deck.
- No signup, no downloads, no file uploads. Tools run in your browser; the few that need an outside service say so on the page.
- Works on desktop, tablet, and mobile. Install as a PWA for offline access.
How to Use Deck Calculator
- Open the tool: Launch Deck Calculator on Toololis — no account or download needed.
- Enter your data: Paste text, enter values, or select a file directly in your browser.
- Get instant results: Everything is processed locally — results appear immediately.
- Copy or download: Save your output or share it. Bookmark for quick access next time.
Deck Calculator — Quick Facts
- Price
- Free — no limits, no watermarks, no paywalls
- Privacy
- Processed in your browser. Tools that need an outside service say so on the page. Page views are counted (Google Analytics).
- Platform
- Any modern browser on desktop, tablet, or mobile
- Category
- Calculator Tools on Toololis
- Offline
- Works offline after first visit (Progressive Web App)
| Feature | Details |
|---|---|
| Tool | Deck Calculator |
| Category | Calculator |
| Signup Required | No |
| File Upload | None — processed in browser |
| Mobile Support | Fully responsive |
| Cost | Free forever |
Why Use Deck Calculator?
You should try Deck Calculator for a quick, private way to joists, deck boards, footings for any deck. Processing happens in your browser and files are never uploaded; the few tools that need an outside service say so on the page.
On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.