Pool Pump Savings Calculator

See how dropping motor RPM cuts power by the cube of the speed ratio — and whether the upgrade pays for itself.

Pool & Current Pump

Pool volume (gallons)

Current pump horsepower

Single-speed run hours per day

VS pump runs 2× hours at 1,725 RPM for the same turnover.

Local electric rate ($/kWh)

Operating months per year 5 mo

VS pump purchase & install ($)

Energy Comparison

Single-speed annual kWh

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Variable-speed annual kWh

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Single-speed annual cost

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VS pump annual cost

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Payback period

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Annual savings vs upfront premium.

Required GPM for turnover: —

5-year accumulated savings

Practical tips & common mistakes

Run longer, slower

Variable-speed wins by running low RPM longer for the same turnover — not by running the same hours at low speed only.

Ignoring plumbing head

Affinity laws assume clean baskets and proper valve position. Closed half your returns and power curves lie.

Two-speed scheduling

Many installs use 1,725 RPM for 16 hrs + brief high-speed skim. Model your actual schedule against single-speed baseline.

Utility rebates

Many utilities rebate VS pump installs — subtract rebates from upgrade cost before judging payback months.

Note: Affinity-law estimates assume clean baskets, proper plumbing, and 1,725 RPM low-speed scheduling. Actual GPM curves vary by pump model and head pressure.