Room Heater BTU Calculator

Radiator Sizing by Room

$4.99 · Designed for iPad. Not verified for macOS.

RadiatorBTU Sizer - professional calculator. Not sure how many BTUs you need to heat a room? Buying the wrong radiator wastes money and leaves you cold. This calculator determines the exact 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, windows, and ceiling - 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) - Window type adjustments - Baseboard and panel radiator support - Works completely offline - No account or login required Built for HVAC technicians, plumbers, heating contractors, and homeowners planning system upgrades.

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

Version 1.0.3

The developer, Shanghai Sheyuan Network Technology Co., Ltd., 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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Shanghai Sheyuan Network Technology Co., Ltd.
    Size
    • 1 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 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.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Sheyuan Inc.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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