1. Home
  2. Topics
  3. Room Heating Calculator

Best Room Heating Calculator Apps

209+ iOS apps curated and reviewed

4.7 avg rating
18 free apps
Updated June 2026

With an average user rating of 4.7★, the room heating calculator category is one of the App Store's strongest. Browse all 209+ apps we track, sorted so the most loved ones surface first.

Compare top Room Heating Calculator Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1OneCalc: All-in-one CalculatorOneCalc: All-in-one CalculatorFree4.6★ (4.8K)YesNoJul 2026
2HVACR Check & ChargeHVACR Check & ChargeFree4.8★ (17K)NoNoJul 2026
3Construction Master Pro CalcConstruction Master Pro CalcFree4.8★ (39K)NoYesJul 2026
4Feet and Inches CalculatorFeet and Inches CalculatorFree4.6★ (384)YesYesJul 2026
5Calculator--Calculator--Free4.7★ (910)YesNoJul 2026
6Digital Temperature ConverterDigital Temperature ConverterFree4.6★ (1.1K)YesYesJun 2026
7Big Button Calculator Pro LiteBig Button Calculator Pro LiteFree4.7★ (13K)YesNoJul 2026
8PCalc LitePCalc LiteFree4.4★ (214)NoYesJul 2026

Top Picks for Room Heating Calculator

OneCalc: All-in-one Calculator#1

OneCalc: All-in-one Calculator by tasser gyati

Calculates everything. Try it.
Editor's Choice
📊 Productivity
4.6😊(4.8K ratings)
FreeAds
OneCalc: All-in-one Calculator screenshot 1
OneCalc: All-in-one Calculator screenshot 2
OneCalc: All-in-one Calculator screenshot 3
OneCalc: All-in-one Calculator screenshot 4
OneCalc: All-in-one Calculator screenshot 5
OneCalc: All-in-one Calculator screenshot 6

This app offers a comprehensive suite of over 40 calculators and unit converters for various needs, including finance, health, construction, and everyday math. It features standard, scientific, and specialized calculators for tasks like loan amortization, currency conversion, and material estimation.

What We Love

  • 🚀 Excellent app with many handy extras
  • 👍 Easy to use and one of the daily drivers
  • 👍 Helps with work
  • 👍 Great for calculations and conversions

Room to Improve

  • 🐛 Crashes when using the 'More' section
  • 🐛 Incorrect date duration calculations
  • 🔍 Ads can be intrusive and disrupt calculations
HVACR Check & Charge#2

HVACR Check & Charge by Copeland LP

PT Charts Superheat Subcooling
Strong Contender
🔍 Reference
4.8😊(17K ratings)
Free
HVACR Check & Charge screenshot 1
HVACR Check & Charge screenshot 2
HVACR Check & Charge screenshot 3
HVACR Check & Charge screenshot 4
HVACR Check & Charge screenshot 5
HVACR Check & Charge screenshot 6

This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.

What We Love

  • 🚀 Convenient
  • 🚀 Great program
  • 🚀 Reliable app
  • 🚀 Easy and quick charging reference

Room to Improve

  • 🐛 Pressure settings not helpful
  • 🔒 Concerning privacy policy
  • 🐛 Restricted temperature range
Construction Master Pro Calc#3

Construction Master Pro Calc by Calculated Industries

Feet Inch Fraction Calculator
Worth Considering
🔧 Utilities
4.8😐(39K ratings)
FreeIn-App Purchases
#51in Utilities
Construction Master Pro Calc screenshot 1
Construction Master Pro Calc screenshot 2
Construction Master Pro Calc screenshot 3
Construction Master Pro Calc screenshot 4
Construction Master Pro Calc screenshot 5
Construction Master Pro Calc screenshot 6

This app is a powerful construction calculator designed for professionals working with dimensions. It offers a wide range of solutions for dimensional math, right angle calculations, area and volume, and special functions, helping to improve speed and accuracy in layouts, bids, and estimates.

What We Love

  • 🚀 Convenient and always available
  • ⚙️ Comprehensive construction calculations
  • 💪 Industry-standard tool
  • 🔍 Accurate and reliable

Room to Improve

  • 💰 Subscription model too expensive
  • 🔒 Locks data behind subscription
  • 🔄 Forced to re-purchase after device changes

More Room Heating Calculator apps to explore

4
Feet and Inches Calculator
Feet and Inches Calculator
Feet and Inches Calculator
Perfect Construction Calc!
Free

A powerful construction calculator designed for tradespeople. It offers a wide range of tools for estimating, layout, framing, and jobsite calculations, helping to save time and improve accuracy. Supports both imperial and metric units.

Construction math and estimatingLayout, framing, and jobsite calculationsImperial and metric unit conversion
🔧 Utilities
(384)
free with in-app purchases
5
Calculator--
Calculator--
Calculator--
by Horizon Business, Inc.
Free

This is a straightforward calculator application designed for ease of use and clear readability. Users can personalize the app's appearance by choosing their preferred background and display themes.

Easy to use interfaceClear displayCustomizable background
🔧 Utilities
(910)
ad-supported
6
Digital Temperature Converter
Digital Temperature Converter
Digital Temperature Converter
°C to °F Calculator & Checker
Free

Effortlessly convert temperatures between eight different units including Celsius, Fahrenheit, Kelvin, and more. This app provides accurate conversions with clear formulas, making it ideal for students and professionals needing quick temperature calculations.

Converts between 8 temperature unitsDisplays conversion formulasUser-friendly interface
🔧 Utilities
(1.1K)
free with in-app purchases
7
Big Button Calculator Pro Lite
Big Button Calculator Pro Lite
Big Button Calculator Pro Lite
Easy Basic Calculator
Free

A user-friendly calculator app featuring large buttons and customizable colorful backgrounds. It offers a dual-line display, multi-line input for complex equations, and convenient gesture controls for editing and copying.

Large buttonsDual-line display18 color themes
🔧 Utilities
(13K)
ad-supported
8
PCalc Lite
PCalc Lite
PCalc Lite
The Best Calculator
Free

This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.

Optional RPN modeMultiple undo and redoUnit conversions and constants
🔧 Utilities
(214)
free with in-app purchases
9
AirPro: BTU Calculator
AirPro: BTU Calculator
AirPro: BTU Calculator
HVAC Calculator: House Heating
Free

This tool helps you calculate the right size for air conditioners, heat pumps, and furnaces. It provides detailed analysis of heating and cooling costs, energy consumption, and temperature data. You can also evaluate domestic hot water needs and financial aspects like payback periods.

BTU estimation for HVAC systemsMonthly heating and cooling cost calculationEnergy consumption and temperature analysis
📊 Productivity
(5)
free with in-app purchases
10
AC Calculator - HVAC Sizing
AC Calculator - HVAC Sizing
AC Calculator - HVAC Sizing
Air conditioner or Heat Pump
Free

This utility app simplifies HVAC sizing by calculating BTU/h capacity and recommending equipment. It offers unit conversions, price estimates, and energy consumption comparisons. Advanced features can be unlocked via in-app purchases.

Calculate BTU/h capacityRecommend equipment typesConvert BTU, kW, Kcal, Tons
🔧 Utilities
(20)
free with in-app purchases
11
Cr Calc – Cold Room Calculator
Cr Calc – Cold Room Calculator
Cr Calc – Cold Room Calculator
by Anatoliy Gershman
Free

This app assists in calculating heat gain for cold rooms, supporting various heat sources and construction materials. It offers project organization and in-app help, with an optional subscription for PDF export.

On-the-fly calculationsMultiple heat gain typesExtensive material selection
🔧 Utilities
(2)
freemium
12
P-T Calculator
P-T Calculator
P-T Calculator
by National Refrigerants, Inc.
Free

This tool simplifies HVAC/R technician tasks by calculating pressure/temperature relationships, superheat, and subcool. It automatically adjusts for altitude and offers English/Metric units. Easily access favorite refrigerants and supplementary information.

Pressure/Temperature calculationSuperheat/Subcool calculationAutomatic altitude correction
🔍 Reference
(51)
free
13
BTU Calculator - Air Conditioner
BTU Calculator - Air Conditioner
BTU Calculator - Air Conditioner
by Queen Mob
Free

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.

BTU calculationAir conditioner sizingRoom dimension input
🔧 Utilities
(5)
free
14
Cold Room Calculator
Cold Room Calculator
Cold Room Calculator
by LU-VE S.p.A.
Free

This tool quickly calculates the necessary cooling capacity for cold rooms. It allows users to input temperature, dimensions, insulation, heat loss, and product data to generate instant calculations. Results can be emailed for easy sharing.

Calculate cooling capacityInput temperature dataEnter cold room dimensions
💼 Business
(3)
free
15
Room Temperature + Thermometer
Room Temperature + Thermometer
Room Temperature + Thermometer
Indoor Temperature Checker App
Free

This app provides real-time indoor room temperature and outdoor weather updates. It also monitors humidity levels and wind speed, offering a convenient way to stay informed about your climate.

Indoor room temperature measurementReal-time outdoor weather updatesHumidity level monitoring
☀️ Weather
(35)
free with in-app purchases
16
Calculator Pro Elite
Calculator Pro Elite
Calculator Pro Elite
Best Calculator
$9.99

A highly customizable calculator app offering a modern interface and powerful features. Personalize themes, button layouts, and visual elements to your preference. Track and save calculations with a detailed history, and access scientific functions when needed.

Customizable themes with gradients, colors, or photosMultiple button shapes and color customizationDual-line display for input and result
🔧 Utilities
(2K)
free with in-app purchases
17
PCalc
PCalc
PCalc
The Best Calculator
$9.99

A powerful calculator designed for professionals and students, offering advanced features like RPN mode, multi-line display, and extensive unit conversions. It supports various number systems and includes an Apple Watch app for on-the-go calculations.

Optional RPN modeMulti-line displayExtensive unit conversions
🔧 Utilities
(758)
free with in-app purchases
18
CalcBox -All in One Calculator
CalcBox -All in One Calculator
CalcBox -All in One Calculator
Multipurpose calculator
Free

This app combines numerous essential calculation tools into a single, user-friendly interface. It handles everything from basic arithmetic and unit conversions to financial planning, health tracking, and academic performance. Simplify your daily tasks with this comprehensive utility.

Basic and scientific calculationsExtensive unit and currency conversionFinancial calculators (loan, deposit, tip, discount)
🔧 Utilities
(347)
free with in-app purchases
19
Heating & Cooling HVAC Pro+
Heating & Cooling HVAC Pro+
Heating & Cooling HVAC Pro+
HVAC Tools
Free

This app provides HVAC professionals with quick access to product information, tools, and support. It allows users to check pricing, availability, find locations, and manage warranty claims. Features include a PT calculator, duct calculators, and a flashlight tool for on-site work.

View pricing and order statusReal-time product availabilityFind branch locations and hours
📊 Productivity
(43)
ad-supported
20
Basic Calculator: Classic Calc
Basic Calculator: Classic Calc
Basic Calculator: Classic Calc
big buttons and wallpapers
Free

A free, classic calculator app with large, easy-to-press buttons and customizable skins. It supports basic arithmetic, memory functions, and can handle very large numbers without using scientific notation. Multitasking is also supported on compatible devices.

Large, easy-to-press buttonsMultiple beautiful skinsBasic arithmetic operations
🔧 Utilities
(3.1K)
free with in-app purchases

FAQ about Room Heating Calculator

What are the best room heating calculator apps for iPhone?
OneCalc: All-in-one Calculator tops our room heating calculator apps ranking as of June 2026, with a 4.6-star average from 4.8K App Store ratings, and it's free to download.
Yes — 18 of the top room heating calculator apps we rank are free to download, including OneCalc: All-in-one Calculator and HVACR Check & Charge.
OneCalc: All-in-one Calculator shows ads and has no in-app purchases, according to its App Store listing as of June 2026.
We track 209+ room heating calculator apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides a free, ad-supported collection of over 40 specialized calculators and unit converters. It covers a wide range of categories including finance, health, date and time, construction, shopping, and everyday math, making it a versatile tool for various calculation needs.
Key features include a standard calculator with advanced scientific functions, a unit converter for metric/imperial units, financial calculators for loans and savings, health trackers like BMI and calorie calculators, construction material estimators, and date/time duration calculators.