# BTU Calculator: Room Heater — Radiator Sizing by Room

> Radiator Sizing by Room (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/btu-calculator-room-heater/id6761745704 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-04-08
- Data updated: 2026-09-17

## What is BTU Calculator?

Not sure how many BTUs you need to heat a room? Buying the wrong radiator wastes money and leaves you cold. This calculator estimates the heating output required for any room based on its dimensions, insulation quality, window area, and climate zone.

Enter room length, width, ceiling height, insulation level, window area, and climate zone. Get required BTU output, recommended radiator sections, and kW equivalent instantly.

WHAT IT CALCULATES:
- Required BTU/h for the room
- Heat loss through walls and windows
- Number of radiator sections needed
- Output in BTU and kW
- Insulation and exposure adjustments

KEY FEATURES:
- Multiple climate zone presets
- Insulation quality levels (poor to excellent)
- Works completely offline
- No account or login required

Built for HVAC technicians, plumbers, heating contractors, and homeowners planning system upgrades.

## Is BTU Calculator safe?

Not enough ratings yet to assess BTU Calculator.

## Is BTU Calculator legit?

BTU Calculator: Room Heater appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for BTU Calculator is 60 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.0.4 — 2026-09-10

Updated app name and metadata.

### 1.0.3 — 2026-07-01

Added a More Pro Tools section to discover related field calculators.

### 1.0.2 — 2026-04-14

Bug fixes and performance improvements.

### 1.0.1 — 2026-04-08

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*