Mila's Slope Calculator PRO
Percent, degrees, ratio, and rise/run — with a live triangle diagram.
What’s New
Version 2.8.23 · 2026-05-27
• New users get a quick welcome tour covering slope basics, the rise/run triangle, favorites, and curated reviews
• Calculator keyboard now feels just like the system keyboard with click sounds and haptic feedback on every tap
About Mila's Slope Calculator PRO
Ramp specs, roof pitch, trail grade, and civil drawings rarely use the same slope notation — percent, degrees, ratio (1:x), and per mille show up interchangeably. Mila's Slope Calculator PRO is a standalone iPhone and iPad app from the developer of Mila's Tools (Apple Staff Pick, 4.8 from 1,200+ reviews) that converts between all four formats and draws the triangle as you work.
Four slope formats, synchronized
Type a grade as percent, degrees, a 1:x ratio, or per mille (‰) and the other representations update immediately. Adjustable decimal precision and share-as-text export make it easy to paste results into email, notes, or field reports.
Rise and run from real measurements
When you know vertical and horizontal distance, enter rise and run instead of an abstract slope value. Input modes include plain numbers, feet plus inches, or meters plus centimeters. The app computes slope length (hypotenuse) automatically so you can check diagonal distance against a tape measure or plan dimension.
See the slope, not just the number
A live triangle diagram tracks your entries — rise, run, angle, and slope length animate as you type so you can sanity-check whether a 12% grade matches the sketch in front of you.
Typical uses
- Landscaping and ADA ramp checks (percent vs. ratio)
- Roofing and construction pitch in degrees or rise/run
- Running, cycling, and hiking grade comparisons
- Engineering homework and field notes that mix unit systems
Frequently asked questions
- What slope units does the app support?
- Percent (%), degrees (°), ratio (1:x), and per mille (‰), all linked in real time.
- Can I enter rise and run in feet and inches?
- Yes. Choose unitless numbers, feet+inches, or meters+centimeters for rise/run entry; hypotenuse length is calculated for you.
- Does the triangle diagram update live?
- Yes. Rise, run, angle, and slope length on the diagram reflect your current inputs as you type.
- How does this relate to Mila's Tools?
- It is the dedicated slope calculator from the same developer — focused layout without opening the full 29-category converter.
Privacy
Calculations run on your device. Mila's Slope Calculator PRO does not send your measurements to a server.