Ladder Angle Calculator
Live Inclinometer Safe Setup
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Find the safe 4:1 ladder angle from your height in seconds, then check the real lean live with your phone.
Set every ladder at the safe angle before you climb. LadderAngle finds the correct 4:1 lean (about 75.5°) from your wall height and ladder length, then lets you check the real angle live with your phone.
Most ladder falls come from one thing: the wrong angle. Too steep and it tips back, too shallow and the feet slide out. LadderAngle turns the OSHA / HSE 1-in-4 rule into a two-second check — do the math first, then lean your phone on the rail and watch the on-screen angle turn green when it's right.
WHAT YOU GET
- The exact safe angle and base distance for your ladder, in metric or imperial
- A clear SAFE / CAUTION / UNSAFE verdict as you type, so you never guess
- A live inclinometer that reads the real ladder angle and locks the reading
- A visual ladder diagram that updates as you change height, base or length
- Saved setups for every ladder and job you check regularly
- A built-in safe-setup checklist, 3-points-of-contact and duty-rating reference
PERFECT FOR
- Roofers and gutter cleaners setting extension ladders
- Painters and decorators working off a lean-to ladder
- Trade and construction crews who need an OSHA / HSE angle check
- Home DIYers who want to climb without taking a chance
WHY NOT JUST EYEBALL IT
Guessing is exactly how ladders slide out. The 4:1 rule looks simple, but the base distance changes with every wall height — LadderAngle does that math instantly and then proves it against the real angle with your phone's motion sensor. No tape measure, no protractor, no maths in your head.
PRIVACY
Fully offline. No account, no ads, no tracking, no data leaves your phone.
FULL ACCESS
LadderAngle Pro unlocks the full app — the live inclinometer, unlimited saved setups, the complete safe-setup checklist and the OSHA / HSE / ANSI duty-rating reference. Choose the plan that suits you:
- Weekly subscription
- Yearly subscription
- Lifetime one-time purchase
Subscriptions renew automatically unless cancelled at least 24 hours before the period ends; manage or cancel anytime in your App Store account settings.
Check your next ladder before you climb it — download LadderAngle and set it at the safe angle.
Terms of Use (EULA): https://web-levi.web.app/terms
Privacy Policy: https://web-levi.web.app/privacy-policy
Questions or feedback: tphuc.work@gmail.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes and performance improvements.
Subscriptions
In-App Purchases
The developer, Phuc Pham, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Phuc Pham
- Size
- 12 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Roof Pitch & Slope — Lifetime $49.99
- Inclinometer — Yearly $24.99
- Climb Height Calc — Weekly $4.99
- Copyright
- © 2026 Phuc Pham