Pool Equipment Sizing Calculator

Standard	Domestic Turnover (h)	Swimming Turnover (h)	Teaching Turnover (h)	Leisure Turnover (h)	Hydrotherapy Turnover (h)	Spa Turnover (h)	Domestic Filtration (m³/m²/h)	Swimming Filtration (m³/m²/h)	Skimmer Area (m²/skimmer)	Surface Flow Ratio (%)	Bather Load (m²/bather)
PWTAG (UK)	8	4	2.5	1.5	0.5	0.33	50	30	50	75	10 (domestic), 2.7 (swimming)
ISPE (UK)	8	4	2.5	2	0.5	0.5	50	30	40	70	10 (domestic), 2.5 (swimming)
SPATA (UK)	8	4	3	2	0.5	0.33	50	30	50	75	10 (domestic), 2.5 (swimming)
European (EN 15288)	8	4	2	1.5	0.5	0.25	40	30	40	50	10 (domestic), 2.5 (swimming)
US (ANSI/APSP)	8	6	4	2	0.5	0.5	60	50	46.5	80	10 (domestic), 2.3 (swimming)
Australian (AS 1926)	8	4	2.5	2	0.5	0.33	50	37	40	75	10 (domestic), 2.5 (swimming)

Pool Dimensions

Length (m)

Width (m)

Average Depth (m)

Enter volume manually

Pool Configuration

Pool Use Type

Pool Design

Pool Location

Weather Location (address, city, or postcode)

Season Start

Season End

Water Temperature (°C)

Cover Open Period (hours/day)

Design Standards

Override Settings

Turnover Rate Override

Filtration Rate Override

Equipment Selection

Skimmer Type (if applicable)

Pump Head Override (m)

Pool Shell U-Value (W/m²K)

Cover U-Value (W/m²K)

Flow Distribution

Surface Flow % (Skimmer Pools)

Pump Efficiency

Wind Speed (m/s, outdoor)

Indoor Relative Humidity (%)

Heated Days per Year

Pool Volume & Capacity

Total Volume: -

Surface Area: -

Maximum Bather Load: -

System Configuration

Number of Filter/Pump Systems:

Filtration System

Turnover Period: -

Total Flow Rate Required: -

Flow Rate per System: -

Filtration Rate: -

Filter Area Required (per system): -

Recommended Filter Size: -

Number of Filters: -

Pump Requirements

Pump Flow Rate: -

Estimated Head: -

Pump Power Required: -

Recommended Motor Size: -

Water Collection

Pool Design Type: -

Surface Flow Ratio: -

Number of Skimmers: -

Number of Main Drains: -

Flow per Skimmer: -

Selected Skimmer Type: -

Flow per Main Drain: -

Balance Tank Size: -

Pipework Sizing

Main Suction Line (per system): -

Main Return Line (per system): -

Velocity in Pipes: -

Heating Requirements

Estimated Heat Loss (cover off): -

Estimated Heat Loss (pool shell): -

Required Heater Size: -

Required Heater Size (BTU/hr): -

Estimated Daily Energy Use: -

Estimated Annual Energy Use: -

Important Notes:

These calculations are based on the selected design standard (e.g., PWTAG, ISPE, SPATA, etc.) and provide general sizing recommendations
Maximum bather load calculated based on the selected standard guidelines
Always consult with a qualified pool engineer for final equipment selection
Consider local regulations and specific site conditions
Turnover and filtration rates can be manually overridden for custom designs
Filter media velocity is calculated according to pool type (20-50 m/h)
Skimmer pools use 75% surface / 25% bottom water removal
Deck level pools use 100% surface water removal via overflow
One skimmer per 50m² surface area (SPATA guidelines)
Maximum 30 m³/h flow per skimmer (SPATA guidelines)
Maximum 12 m³/h flow per main drain (2" pipework)
Minimum 2 main drains per pump (one pump per filter)
Multiple filter/pump systems can reduce individual equipment sizes

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Software designed by Alex Kemsley, Technical Director at Compass Pools