Question 1

Is this electrical panel load calculator really free?

Accepted Answer

Yes. No email required. No credit card. No hidden upsells. Just enter your info and get your results.

Question 2

What code does this calculator use?

Accepted Answer

It follows the National Electrical Code (NEC) 2020, specifically Tables 220.12, 220.55, and 220.54, plus Articles 210.52 and 220.14. These are legally binding in most US jurisdictions.

Question 3

Do I need to enter my email to download the results?

Accepted Answer

Nope. You can download or print your results without giving us any personal info. We don't collect data.

Question 4

What if my appliances have different wattages than the defaults?

Accepted Answer

You can adjust any appliance wattage in the calculator. Check the nameplate on your appliance for the exact value.

Question 5

Can I use this for a commercial building?

Accepted Answer

No. This calculator is designed for single-family residential homes per NEC 2020. Commercial buildings have different load calculation methods.

Question 6

I got a result saying my panel is overloaded. Now what?

Accepted Answer

That means you likely need a service upgrade. Contact a licensed electrician to do a full load calculation and quote the work. This calculator is a planning tool — it gives you a ballpark, not a final answer.

Question 7

Does the calculator include demand factors?

Accepted Answer

Yes. It applies demand factors automatically based on NEC Table 220.55 for ranges and other applicable sections.

Question 8

What's the typical service size for a modern home?

Accepted Answer

Most new homes have 200 A service. Older homes often have 100 A. Large homes or those with electric heat, AC, and a pool might need 400 A. This calculator will tell you what you need.

Question 9

How accurate is this calculator?

Accepted Answer

For standard residential setups, it's very accurate — within 5% of a manual NEC calculation. But it's not a substitute for a licensed electrician's on-site evaluation.

Question 10

I have a heat pump and electric heating. How does the calculator handle that?

Accepted Answer

It uses the larger of the two loads, per NEC rules. You don't need to count both.

Free Electrical Panel Load Calculator Online

Get Your Estimate

How the Electrical Panel Load Calculator Works