BTU Radiator Calculator
Plan CD
Getting the latest details from the App Store…
Plan CD
Getting the latest details from the App Store…
Stop guessing which radiator to order — get the exact BTU/hr, Watts, and kW a room needs before you buy. BTU Calculator uses the UK standard heat-loss formula, covering conventional boilers and heat pump upgrades. HOW IT WORKS Enter your room dimensions and a few details about the room's construction — wall type, glazing, what's above and below the room, and how many external walls are exposed. The app calculates heat loss through every surface and accounts for air changes, then adds a 15%…
Top of Paid · Utilities in United Kingdom. BTU Radiator Calculator is #85 there. Changes are over 7 days.
How the app presents itself on the App Store. Select a screenshot to open it full size.
Version 1.3 · 17 Sep 2026 · 21 days ago
— Fixed: switching between metric and imperial now converts your dimensions, so the room stays the same size — Copy or share the current calculation straight from the Calculator tab, without saving it first — Renamed to BTU Radiator Calculator — Version and build number shown under Settings — VoiceOver labels for the result card and breakdown chart; consistent kW formatting — Includes everything from 1.2: radiator size guide, heat pump ΔT support, multiple windows per room, room presets, whole-house total, iPad split view, CSV export
Every chart this app is in right now, best position first.
| Chart | Rank | 24 h | 7 days | Best | Days on chart |
|---|
Higher on the chart is better: #1 is at the top.
Their other apps that Appulse has seen in the charts, charting ones first.
| App | Best rank now | Released | App Store |
|---|---|---|---|
 Aerial Aligner: Freeview UKUtilities | Paid · UtilitiesUnited Kingdom#20 |
| United Kingdom· Paid · Utilities | #85 | Change unknown | Change unknown | #85 | 1 |
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United Kingdom · Paid · Utilities: best #85, latest #85, over 2 snapshots since 8 Oct. No snapshots from 8 Oct to 9 Oct; the line joins the snapshots on either side.
Entries, big moves, #1s and new versions we've recorded.
