Code-aware stair planning for the job site
Calculate rise, run, stringer length, and layout details without second-guessing the math.
Stair Calculator gives builders, remodelers, deck installers, and serious DIYers a faster way to plan stair geometry, review warnings, and export clean layouts from iPhone and iPad.
- Imperial and metric input support
- Code-aware warnings with pass, warning, and fail states
- Saved projects, PDF export, and clean image sharing
Pass
Check headroom
Built for real stair jobs
Clear math, cleaner output, and fewer costly misses.
Code-aware results
Review riser, tread, angle, landing, and fit warnings instead of only seeing raw geometry.
Multiple stair types
Plan straight, landing, L-shape, U-shape, and winder layouts with one workflow.
Save and reuse jobs
Keep stair projects on-device, duplicate previous layouts, and reopen work without starting from scratch.
Export for crew or client
Create image or PDF outputs with stair measurements, diagram context, and compliance notes.
Simple workflow
From dimensions to a shareable stair plan in minutes.
Enter project dimensions
Add total rise, available run, stair width, tread thickness, and the preferred unit system.
Choose code and stair type
Select a planning preset and the stair configuration that matches the job.
Review geometry and warnings
See risers, treads, angle, stringer length, and any code-aware warnings before cutting material.
Save, share, or export
Keep the job in project history or send a PDF or image plan to the crew or client.
Preview
Designed for quick field decisions, not spreadsheet archaeology.
Dashboard
- Resume a draft or start a new stair project
- See saved-project usage and default code preset
- Jump back into recent jobs quickly
Calculator
- Fast rise and run entry in imperial or metric
- Advanced inputs for headroom and landing depth
- Premium-gated advanced stair types and custom presets
Results
- Summary cards for risers, treads, angle, and stringer length
- 2D stair diagram with landing and winder context
- Image, PDF, and copy-measurement export actions
Free and Pro
A useful free tier, with Pro for heavier job-site workflows.
Free
$0
- Unlimited straight-stair calculations
- Imperial and metric support
- Basic residential code checks
- Up to 3 saved projects
- Watermarked image export
Stair Calculator Pro
Pro
$2.99/mo or $14.99/yr
- Unlimited saved projects
- Advanced stair types
- Custom code presets
- Clean image export and PDF export
- No ads
Important
Stair Calculator is a planning aid, not a permit, engineering stamp, or code approval.
Users remain responsible for field measurements, material choices, structural evaluation, permit requirements, and compliance with local building code and inspection rules. Always verify project-specific requirements before construction.