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HVAC Calculators


Explore our collection of essential HVAC calculators designed to help contractors quickly and accurately calculate airflow, load, duct size, and more. These tools streamline complex calculations, ensuring efficient system design and optimal performance for every project.


ACH Calculator

ACH Calculator

The ACH (Air Changes per Hour) Calculator helps HVAC contractors determine how many times the air in a room is replaced each hour.

Air flow rate calculator

Air Flow Rate Calculator

The Air Flow Rate helps calculate the flow rate of air moving through a duct or pipe based on its diameter and the velocity of the air.

BTU Calculator

BTU Calculator

The BTU Calculator estimates the heating or cooling needed for a space by calculating the required British Thermal Units (BTUs).

CFM Calculator

CFM Calculator

Calculate the required airflow (CFM) for proper ventilation by entering room dimensions and air changes per hour (ACH).

Duct Calculator

Duct Calculator

The Duct Calculator helps HVAC contractors determine the optimal duct size based on airflow and velocity.

CFM Calculator

Parts Markup Calculator

The Parts Markup Calculator helps HVAC contractors quickly calculate the optimal selling price for parts.

CFM Calculator

Pipe Volume Calculator

The Pipe Volume Calculator helps HVAC contractors calculate the volume of a pipe based on its diameter and length.

CFM Calculator

Line Charge Calculator

This Calculator determines the correct refrigerant charge needed for a system based on the length and size of the refrigerant lines.

CFM Calculator

Water Velocity Calculator

This Calculator helps determine the speed of water flowing through a pipe based on the pipe's diameter and flow rate

Load Calculator

HVAC Load Calculator (Manual J)

The HVAC Load Calculator (Manual J) helps accurately estimate heating and cooling loads for residential spaces. This tool is exclusively available to RUUD Pro Partners. To access it, please sign in to  My.ruud.com and use the Design Star Load Calculator.