249+ iOS apps curated and reviewed
Out of 249+ btu calculator apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (3) | Yes | No | Oct 2026 | |
| 2 |  | Free | 4.6★ (318) | Yes | Yes | Oct 2026 | |
| 3 |  | Free | 5.0★ (5) | No | No | May 2026 | |
| 4 |  | Free | — | No | No | Jun 2026 | |
| 5 |  | Free | 5.0★ (5) | Yes | Yes | Oct 2026 | |
| 6 |  | Free | 4.8★ (20) | No | Yes | Oct 2026 | |
| 7 |  | Free | 4.0★ (8) | No | Yes | Oct 2026 | |
| 8 |  | $0.99 | — | No | No | Oct 2026 |
Calculate the correct BTU and tonnage for your AC or heating unit based on room dimensions, insulation, sun exposure, and occupants. Get an adjusted recommendation and see how each factor influences the final sizing. Supports both imperial and metric units.
Estimate the cooling capacity needed for your data center. This tool considers factors like space, occupants, and heat output to help you maintain optimal temperature and humidity. It provides instant results as you update inputs, serving as a guide for system selection.
This utility helps you determine the appropriate cooling capacity for an air conditioner based on room size and other factors. It simplifies the process of selecting the right unit to ensure optimal comfort and energy efficiency.
