Quickly calculate missing dimensions for layouts and designs based on various aspect ratios. Features presets like the golden ratio, custom inputs, and a live visual preview. Automatically copies results to your clipboard.






245+ iOS apps curated and reviewed
The best ratio calculator pro apps on iPhone average 4.0★ across 245+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | — | No | No | Oct 2026 | ||
| 2 | $1.99 | 3.0★ (4) | No | No | Nov 2026 | ||
| 3 | Free | 3.2★ (13) | No | Yes | Nov 2026 | ||
| 4 | Free | 4.9★ (410K) | Yes | No | Nov 2026 | ||
| 5 | Free | 4.9★ (34K) | Yes | Yes | Nov 2026 | ||
| 6 | Free | 4.4★ (7) | No | No | Oct 2026 | ||
| 7 | $0.99 | — | No | No | May 2026 | ||
| 8 | Free | 4.7★ (61K) | No | No | Nov 2026 |












Quickly calculate missing dimensions for layouts and designs based on various aspect ratios. Features presets like the golden ratio, custom inputs, and a live visual preview. Automatically copies results to your clipboard.


This utility app specializes in calculating proportions, solving for an unknown value in direct and inverse ratio equations. It handles scenarios like price increases and speed decreases, offering a simple yet effective tool for proportion-based problems.