01
The purpose
What does this calculator estimate?
Add up the amps and kilowatts of all your pool equipment — pump, heater, lights, salt cell — for panel sizing.
Electrical · H4
Total Pool Electrical Load Calculator
Add up the amps and kilowatts of all your pool equipment — pump, heater, lights, salt cell — for panel sizing.
Measure the inputsTotal the load to size the pool sub-panel and main feed correctly.
Read the full resultElectric heaters dominate the load — they can dwarf everything else combined.
Check the boundaryAdd headroom for future equipment like a heat pump or extra lights.
Useful forElectricalPlanningComparisonVerification
Live calculation
Total load inputs
✓ Checked May 2026
Enter each piece of pool equipment.
Calculated result
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Enter the required values to calculate.
Enter the known values. Let the engine handle the calculation.
✓ Formula checked↻ Live result○ No account needed
Planning estimate only. Confirm product labels, equipment specifications, qualified-professional advice and local requirements before acting.
The result, explained
Use the Total Pool Electrical Load Calculator result with context.
Add up the amps and kilowatts of all your pool equipment — pump, heater, lights, salt cell — for panel sizing.
02
The tool
What information does it use?
- Pump horsepower: enter a measured or verified value
- Pump voltage: 115V or 230V.
- Electric heater: kW (0 if gas).
- Lighting: Total watts of pool/landscape lights.
- Salt cell: kW (0 if no SWG).
- Other equipment: Automation, actuators, etc. (watts).
03
The method
How to use this calculator
- Pump horsepowerEnter the value you can verify.
- Pump voltage115V or 230V.
- Electric heaterkW (0 if gas).
- LightingTotal watts of pool/landscape lights.
- Salt cellkW (0 if no SWG).
- Other equipmentAutomation, actuators, etc. (watts).
04
The relationship
The formula in plain English
Total watts = pump + heater + lighting + salt cell + other; total amps = watts ÷ voltage
Total kW = watts ÷ 1000. Daily kWh ≈ total kW × 8 hrs. Annual kWh = daily × 365.05
Worked through
A worked example: 1.5 HP pump (230V), 5 kW heater, 500 W lights, 0.4 kW salt, 200 W other
- Pump ≈ 5 A × 230 = 1,150 W; + heater 5,000 + lights 500 + salt 400 + other 200
- Total = 7,250 W → 7.25 kW
- Amps = 7,250 ÷ 230 = 31.5 A; annual ≈ 21,170 kWh
| Heater | Total watts | Total amps | Annual kWh* |
|---|---|---|---|
| None (gas) | 2,250 W | 9.8 A | 6,570 |
| 5 kW electric | 7,250 W | 31.5 A | 21,170 |
| 11 kW electric | 13,250 W | 57.6 A | 38,690 |
06
Why it matters
How the result supports the next decision
Total the load to size the pool sub-panel and main feed correctly.
Electric heaters dominate the load — they can dwarf everything else combined.
07
Good inputs
Improve the estimate before relying on it
- Total the load to size the pool sub-panel and main feed correctly.
- Electric heaters dominate the load — they can dwarf everything else combined.
- Add headroom for future equipment like a heat pump or extra lights.
- Convert kW to amps at your system voltage to size the feeder.
- Have an electrician verify the calculated load against your panel capacity.
08
The boundary
How to interpret the result
Use this as a planning reference only; a licensed electrician and local code determine the installation.
The engine reports invalid inputs and safety warnings beside the result. Resolve those messages before using the estimate.
09
Before acting
What should override this estimate?
- Measured site conditions and current test results
- Product labels and manufacturer specifications
- Qualified-professional advice and applicable local codes
10
Common questions
Frequently asked questions
How do I calculate total pool electrical load?
Add up the wattage of every piece of equipment — pump, electric heater, lights, salt cell, and automation — then divide by your system voltage to get total amps, or by 1,000 for total kilowatts. This total drives the size of the pool sub-panel and the feeder from the main panel.
What uses the most electricity at a pool?
If you have an electric resistance heater, it dominates by far — often more than all other equipment combined. Without electric heat, the pump is the largest consumer. Lights, salt cells, and automation draw comparatively little. Knowing the breakdown helps you size the panel and target energy savings.
How big a sub-panel does a pool need?
It depends on your total connected load plus headroom for future additions. Total the amps of all equipment, apply any code demand factors, and size the sub-panel and feeder above that. An electric-heated pool needs a much larger panel than a gas-heated one. An electrician sizes this to code for your setup.
Should I plan for future pool equipment?
Yes. Adding a heat pump, extra lighting, or automation later is far easier if the sub-panel and feeder were sized with headroom from the start. Building in spare capacity avoids a costly panel upgrade down the road. Factor likely future loads into the total when planning the electrical service.
How do I convert kW to amps for my pool?
Divide watts by the system voltage. A 5 kW heater on 230 volts draws about 22 amps; the same load on 115 volts would draw twice that. Summing the amps of all equipment at your voltage gives the total current the feeder and panel must handle.
How many amps does a pool need?
The sum of all equipment amps at your voltage; electric-heated pools can need 50–100+ amps.
What is the biggest electrical load at a pool?
An electric heater, by far; without one, the pump is the largest draw.
How do I size a pool sub-panel?
Total all equipment load, add headroom for future gear, and have an electrician size it to code.
Primary sources
Use the result with current guidance.
These official references support safe planning context. Product labels, local requirements and qualified-professional advice take priority over a general calculator estimate.