Pool Cost Calculator
Estimate your monthly and annual pool operating costs including electricity, heating, chemicals, and water.
Monthly Cost Breakdown
| Pump Electricity | $35 |
| Heater (None) | $0 |
| Chemicals | $50 |
| Water Replacement | $1 |
| Monthly Total | $86 |
How It Works
This calculator estimates your total pool operating costs by combining four main expense categories:
- Pump electricity: Calculated as HP × 0.746 kW/HP × hours/day × 30 days × your electricity rate.
- Heater costs: Gas heaters are calculated in therms (100,000 BTU). Heat pumps use electricity but are roughly 5x more efficient (COP of 5).
- Chemicals: Monthly chemical costs vary by pool size, usage, and climate. $30-$80/month is typical.
- Water replacement: Pools lose 5-15% of their water annually through evaporation, splash-out, and backwashing. Cost is based on local water rates.
Frequently Asked Questions
How much does it cost to run a pool per month?
The average monthly cost to operate a residential pool ranges from $100 to $350, depending on pool size, pump efficiency, heater usage, and local utility rates. A 20,000-gallon pool with a single-speed pump running 8 hours/day typically costs $150-$250/month including chemicals.
Can a variable speed pump really save 50-80% on electricity?
Yes. Variable speed pumps run at lower RPMs most of the time, and pump energy use follows the affinity laws — cutting speed in half reduces energy consumption by roughly 87%. Most pool owners recoup the higher upfront cost within 1-2 years through electricity savings.
Is a gas heater or heat pump cheaper to operate?
Heat pumps are significantly cheaper to operate because they move heat rather than generate it, achieving effective efficiencies of 300-600%. However, gas heaters heat water faster and work better in cold climates. Heat pumps are ideal for maintaining temperature over long periods.
How can I reduce my pool operating costs?
The biggest savings come from upgrading to a variable speed pump, using a pool cover to reduce evaporation and heat loss, running the pump during off-peak electricity hours, and maintaining proper water chemistry to avoid expensive corrective treatments.