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Engineering

Heat Load Calculator

Use this heat load calculator to calculate estimate heat load from area, heat gain factor, occupants, and equipment.

heat loadhvaccooling load

Calculator

Calculate instantly

Calculator Inputs

Choose what you want to calculate, enter realistic values, adjust units where shown, and use the scenario section for repeated-use planning.

Input and Formula Breakdown

This calculator applies the formula Heat load = area x factor + people load + equipment load. Enter each value with the matching unit, and AZCalculate updates the result instantly.

Area
500 sq ft
Heat gain factor
25
Occupants
5
Equipment load
1,500 W
Heat load
14,500 W
Heat load
49,474 BTU/h

Scenario and Comparison

Current

14,500 W

Projected

174,000

Adjusted

15,950

Visual Comparison

Current result14,500
Projected usage174,000
Comparison scenario15,950

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Formula Explanation

Heat load = area x factor + people load + equipment load

This calculator applies the formula Heat load = area x factor + people load + equipment load. Enter each value with the matching unit, and AZCalculate updates the result instantly.

Use Cases

  • Plan HVAC load
  • Compare spaces
  • Estimate cooling demand

Step-by-Step Explanation

  1. Step 1Enter the known values in the calculator fields.
  2. Step 2Keep the units consistent with the labels shown beside each input.
  3. Step 3Apply the formula: Heat load = area x factor + people load + equipment load.
  4. Step 4Review the primary result and supporting values.

Example calculation

Example heat load calculator

Given

  • Area: 500 sq ft
  • Heat gain factor: 25
  • Occupants: 5
  • Equipment load: 1500 W

Steps

  • Use the values shown above.
  • Apply Heat load = area x factor + people load + equipment load.

Result

The calculator above shows the computed answer instantly from these example values.

Calculator guide

About this Heat Load Calculator

Estimate heat load from area, heat gain factor, occupants, and equipment. This page includes an interactive calculator, concise formula notes, worked examples, FAQs, related calculators, and practical guidance you can revisit whenever needed.

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We work hard to keep every calculator accurate and useful. If you notice a calculation error, missing option, or unclear explanation, please let us know so we can review and correct it promptly.

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Calculator usage

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Total saved calculations

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Most active date

2026-06-05

FAQ

Heat Load Calculator FAQs

How does the heat load calculator work?+

It uses Heat load = area x factor + people load + equipment load and calculates the result from the values you enter.

Can I copy or print the result?+

Yes. AZCalculate calculator pages include copy, share, and print actions.

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