--- title: "Radiator Calculator Pro - Reviews, Revenue and Downloads in United Kingdom | Apple App Store" description: "Room-by-room radiator sizing. Watts and BTU/h output for any room, factoring volume, glazing, external walls, roof and floor exposure, and insulation standard. Calculation Heat output per room with a" --- # Radiator Calculator Pro — United Kingdom > Heat Output & BTU Calculator ![Radiator Calculator Pro App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/8d/cc/93/8dcc93d6-b4bc-eca7-01f2-69f7ca0752b5/RadiatorCalculatorAppIcon-0-0-1x_U007epad-0-1-sRGB-85-220.png/434x0w.png) **Developer:** [DigitalKind](https://apptail.io/developer/digitalkind-bvhb) **Category:** Utilities **Rating:** 2.3/5 (3 ratings) **Price:** Free **Bundle ID:** com.magnetic.RadiatorCalculator **Store:** Apple App Store **Country:** United Kingdom **Version:** 2.0 (released 2026-10-26) **Original Release:** 2025-03-17 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/gb/app/app/id6743349772) **AppTail Page:** [https://apptail.io/app/radiator-calculator-pro-zPev/united-kingdom](https://apptail.io/app/radiator-calculator-pro-zPev/united-kingdom) ## Radiator Calculator Pro Description Room-by-room radiator sizing. Watts and BTU/h output for any room, factoring volume, glazing, external walls, roof and floor exposure, and insulation standard. Calculation Heat output per room with adjustments for: • Room type (8 presets: bedroom, living room, bathroom, kitchen, hallway, office, conservatory, garage) • Internal volume • Window-to-floor ratio • Number of external walls (0–4) • What's above (loft, pitched roof, flat roof, heated space) • What's below (garage, unheated cellar, uninsulated floor, heated floor) • Insulation level: poor (older single-glazed) → average (modern build) → good → excellent (new-build, triple-glazed) • Mean water temperature - ΔT30, ΔT35, ΔT40, ΔT50, ΔT60 ΔT correction uses the standard panel-radiator exponent (n = 1.30) per EN 442 testing convention. A 5% safety margin is applied to avoid undersizing. Heat-pump systems Select ΔT35 or ΔT30 to spec radiators for low-temperature systems. Output is rescaled — a 1000W ΔT50-rated radiator delivers ~630W at ΔT35 — so you size to actual delivered heat, not nameplate. Output • Watts and BTU/h side-by-side • Metric or imperial dimensions • Whole-home heat-loss total • Share or export room specs as text For plumbers, heating engineers, and heat-pump installers sizing radiator schedules, and homeowners or landlords running their own jobs. ## Radiator Calculator Pro Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/44/df/1d/44df1d89-b5aa-6a77-6076-e711e65bab83/01.png/1206x2622.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/8d/26/f5/8d26f556-3694-d1f3-8e95-11b03053d576/02.png/1206x2622.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/72/b1/ea/72b1eab5-0ad2-7c84-3d1e-5d18bbb122c6/03.png/1206x2622.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/f3/19/db/f319db1a-3929-b2ae-7c5f-aa110f803b9b/04.png/1206x2622.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ca/87/b3/ca87b3c8-48d3-6ca8-a2f7-87d105360d6a/05.png/1206x2622.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/f9/eb/84/f9eb84e5-0f43-d5bc-91c9-125ba941337a/06.png/1206x2622.png) ## Radiator Calculator Pro Rating Breakdown in United Kingdom - 5 stars: 1 (33%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 0 (0%) - 1 stars: 2 (67%) ## Radiator Calculator Pro Available In - [United Kingdom](https://apptail.io/app/radiator-calculator-pro-zPev/united-kingdom) - [Armenia](https://apptail.io/app/radiator-calculator-pro-zPev/armenia) - [Argentina](https://apptail.io/app/radiator-calculator-pro-zPev/argentina) - [Austria](https://apptail.io/app/radiator-calculator-pro-zPev/austria) - [Bulgaria](https://apptail.io/app/radiator-calculator-pro-zPev/bulgaria) - [Bahrain](https://apptail.io/app/radiator-calculator-pro-zPev/bahrain) - [Brazil](https://apptail.io/app/radiator-calculator-pro-zPev/brazil) - [Belarus](https://apptail.io/app/radiator-calculator-pro-zPev/belarus) - [Canada](https://apptail.io/app/radiator-calculator-pro-zPev/canada) - 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[Israel](https://apptail.io/app/radiator-calculator-pro-zPev/israel) - [India](https://apptail.io/app/radiator-calculator-pro-zPev/india) - [Iceland](https://apptail.io/app/radiator-calculator-pro-zPev/iceland) - [Italy](https://apptail.io/app/radiator-calculator-pro-zPev/italy) - [Jamaica](https://apptail.io/app/radiator-calculator-pro-zPev/jamaica) - [Japan](https://apptail.io/app/radiator-calculator-pro-zPev/japan) - [Kenya](https://apptail.io/app/radiator-calculator-pro-zPev/kenya) - [South Korea](https://apptail.io/app/radiator-calculator-pro-zPev/south-korea) - [Kuwait](https://apptail.io/app/radiator-calculator-pro-zPev/kuwait) - [Kazakhstan](https://apptail.io/app/radiator-calculator-pro-zPev/kazakhstan) - [Mexico](https://apptail.io/app/radiator-calculator-pro-zPev/mexico) - [Malaysia](https://apptail.io/app/radiator-calculator-pro-zPev/malaysia) - [Nigeria](https://apptail.io/app/radiator-calculator-pro-zPev/nigeria) - [Norway](https://apptail.io/app/radiator-calculator-pro-zPev/norway) - [Oman](https://apptail.io/app/radiator-calculator-pro-zPev/oman) - [Peru](https://apptail.io/app/radiator-calculator-pro-zPev/peru) - [Philippines](https://apptail.io/app/radiator-calculator-pro-zPev/philippines) - [Portugal](https://apptail.io/app/radiator-calculator-pro-zPev/portugal) - [Qatar](https://apptail.io/app/radiator-calculator-pro-zPev/qatar) - [Russia](https://apptail.io/app/radiator-calculator-pro-zPev/russia) - [Saudi Arabia](https://apptail.io/app/radiator-calculator-pro-zPev/saudi-arabia) - [Sweden](https://apptail.io/app/radiator-calculator-pro-zPev/sweden) - [Slovakia](https://apptail.io/app/radiator-calculator-pro-zPev/slovakia) - [Thailand](https://apptail.io/app/radiator-calculator-pro-zPev/thailand) - [Taiwan](https://apptail.io/app/radiator-calculator-pro-zPev/taiwan) - [China](https://apptail.io/app/radiator-calculator-pro-zPev/china) - [North Macedonia](https://apptail.io/app/radiator-calculator-pro-zPev/north-macedonia) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. 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