Load Demand Calculator

About the Load Demand Calculator

Calculates the demand load from a connected load by applying a demand factor, since not all loads run at full capacity simultaneously.

How to use this calculator

1. Enter the connected load, such as the total watts or amps of all connected equipment.
2. Enter the demand factor as a decimal or percentage converted to a decimal, such as 0.75 for 75%.
3. Check that both inputs use the same load unit, so the result is in that same unit.
4. Read the demand load result, which is the connected load multiplied by the demand factor.

The formula explained

The formula computes the demand load, which is the part of the connected load expected to be used. It uses demand = connected \times factor.

• demand = the calculated demand load
• connected = the total connected load
• factor = the demand factor as a decimal

Step by step method

1. Write down the connected load and the demand factor.
2. Multiply the connected load by the demand factor.
3. Keep the same unit in the answer, such as watts or amps.

Worked example

Problem. A lighting circuit has a connected load of 12,000 W and a demand factor of 0.75. What is the demand load?

1. Use the formula demand = connected \times factor.
2. Substitute the values, demand = 12,000 \times 0.75.
3. Calculate demand = 9,000 W.

Tips and common mistakes

• Make sure the demand factor is entered as a decimal, not a whole percent, unless the calculator converts it for you.
• Do not mix units, if the connected load is in watts, the answer should also be in watts.

Frequently asked questions