Best AC Calculator alternatives: apps like AC Calculator - HVAC Sizing

10+ similar apps compared and reviewed

4.8 avg rating
9 free apps
Updated October 2026

Looking for something like AC Calculator? We've analyzed 10+ similar apps to help you find the best alternative. Each app is compared by ratings, features, and real user reviews, so you can make the right choice.

Top Alternatives to AC Calculator

BTU Calculator: AC & HVAC#1

BTU Calculator: AC & HVAC by Blas Prieto

Room Size & Unit Sizing
Editor's Choice
πŸ”§ Utilities
5.0(3 ratings)
FreeAds
BTU Calculator: AC & HVAC screenshot 1
BTU Calculator: AC & HVAC screenshot 2
BTU Calculator: AC & HVAC screenshot 3
BTU Calculator: AC & HVAC screenshot 4
BTU Calculator: AC & HVAC screenshot 5

Calculate the correct BTU and tonnage for your AC or heating unit based on room dimensions, insulation, sun exposure, and occupants. Get an adjusted recommendation and see how each factor influences the final sizing. Supports both imperial and metric units.

Allday HVAC Calc#3

Allday HVAC Calc by Dmitrii Pankov

Duct, Pipe & Psychrometrics
Worth Considering
πŸ”§ Utilities
5.0(1 ratings)
FreeIn-App Purchases
Allday HVAC Calc screenshot 1
Allday HVAC Calc screenshot 2
Allday HVAC Calc screenshot 3
Allday HVAC Calc screenshot 4
Allday HVAC Calc screenshot 5
Allday HVAC Calc screenshot 6

This app offers three specialized modules for HVAC engineers: a psychrometric calculator for air properties, a pipe calculator for fluid dynamics and selection, and a duct calculator for air speed and pressure loss. It provides detailed calculations and reference formulas in both SI and IP units.

More apps like AC Calculator

4
HVAC Calculator: BTU & AC Load
HVAC Calculator: BTU & AC Load
HVAC Calculator: BTU & AC Load
by Coffee Room SIA
Free
πŸ”§ Utilities
(0)
5
HVAC Load Calculator Manual J
HVAC Load Calculator Manual J
HVAC Load Calculator Manual J
AC, Heat Pump & Furnace Sizing
Free

This app provides professional HVAC load calculations for contractors, offering three levels of accuracy from quick estimates to detailed Manual J calculations. It's designed for field use with an intuitive interface, offline capabilities, and professional report generation.

Multiple accuracy levels (Simple, Moderate, Pro)Offline-ready calculationsProfessional PDF report generation
πŸ”§ Utilities
(43)
free with in-app purchases
6
Duct Calculator S&P
Duct Calculator S&P
Duct Calculator S&P
by S&P SISTEMAS DE VENTILACION SL.
Free

This utility app performs essential calculations for ventilation systems. It offers tools for converting duct sizes, determining air parameters like speed and airflow, and calculating pressure drops. It also includes a unit converter for various measurements.

Diameter conversion (circular to rectangular)Ventilation parameter calculation (diameter, speed, airflow, pressure)Pressure drop calculation for straight sections and system elements
πŸ”§ Utilities
(1)
free
7
HVAC Pro Calculator: NEC + P-T
HVAC Pro Calculator: NEC + P-T
HVAC Pro Calculator: NEC + P-T
BTU, Duct, P-T & Voltage
Free

This app provides essential tools for HVAC technicians and electricians, including BTU load sizing, duct calculations, and refrigerant pressure-temperature charts. It offers a free tier with core functions and an optional Pro upgrade for advanced features like voltage drop calculations and unlimited job saving.

BTU & Cooling Load SizingDuct Sizing CalculationsNEC Voltage Drop & Wire Sizing
πŸ”§ Utilities
(1)
freemium
8
Blue Cold Heat Load Calculator
Blue Cold Heat Load Calculator
Blue Cold Heat Load Calculator
by Blue Cold Refrigeration Private Limited
Free

Accurately calculate the cooling capacity needed for cold rooms, storage, and freezers. Input room details, insulation, temperatures, and product information for precise, data-driven recommendations. Generate shareable PDF reports for your projects.

Calculate cooling capacityInput room dimensions and insulationDetermine optimal pressure requirements
πŸ”§ Utilities
(1)
free
9
Slope Calculator - Calc
Slope Calculator - Calc
Slope Calculator - Calc
Ratio, Angle, Length, Percent
Free

Calculate slope in angle, percentage, or ratio by inputting two sides of a right triangle. This intuitive and easy-to-use application provides the remaining necessary values.

Calculate slope as angleCalculate slope as percentageCalculate slope as ratio
πŸ”§ Utilities
(104)
free with in-app purchases
10
Duct Calculator Elite
Duct Calculator Elite
Duct Calculator Elite
HVAC Ductulator & Duct Sizing
$9.99

This app simplifies HVAC duct sizing calculations. It computes duct size, velocity, pressure drop, and flow rate with an intuitive interface. Supports various units and duct materials for precise HVAC design.

Calculate duct size, velocity, pressure drop, flow rateDuct Size by Airflow modeDuct Size by Dimension mode
πŸ”§ Utilities
(234)
paid