Swimming Pool Volume — Gallons, Chemicals & Equipment
Calculate pool volume in gallons for rectangular, round, oval, kidney, and freeform pools. Drives chemical dosing, pump/filter/heater sizing, and fill time. Essential for new pool design and maintenance planning.
Why This Construction Metric Matters
Why: Correct pool volume ensures proper chemical dosing (safety), pump/filter sizing (circulation), and heater capacity (comfort). Wrong volume causes over- or under-dosing, poor filtration, and equipment failure.
How: Rectangular: L×W×Avg Depth×7.5. Round: π×r²×D×7.5. Oval: L×W×D×5.9. Average depth = (shallow + deep)/2. Chemical dosing per 10,000 gal. Pump: 6–8 hr turnover. Filter: match pump flow.
- ●Use average depth: (shallow + deep) ÷ 2.
- ●6–8 hour turnover for residential pools.
- ●Chemical dosing based on 10,000 gal increments.
- ●Include hot tub volume if connected.
Pool Calculator
Volume • Chemicals • Pump • Filter • Fill Time
Quick Examples — Click to Load
Small Backyard Pool
12×24 residential pool
Standard Residential
16×32 family pool
Large Family Pool
20×40 pool with diving
Lap Pool
10×50 swimming pool
Round Pool
24 ft diameter round
Pool with Spa
16×32 pool + 400 gal spa
Kidney Pool
Custom kidney shape
Freeform Pool
Custom freeform design
Residential
Standard home pool
🏊 Pool Shape
Planning estimates only. Verify with a licensed engineer or contractor before construction.
📐 Construction Industry Facts
Rectangular: L×W×Avg Depth×7.5 = gallons.
— APSP
Residential turnover: 6–8 hours typical.
— NSF
Chlorine dosing per 10,000 gallons.
— CDC
7.48 gallons per cubic foot.
— NIST
What is a Pool Calculator?
Determines pool volume (gallons/liters), chemical dosing, pump/filter/heater sizing, and fill time. Essential for equipment selection and chemical balancing.
Volume Calculation
Calculate gallons and liters for any pool shape
Chemical Dosing
Chlorine, pH, alkalinity, and calcium
Equipment Sizing
Pump, filter, and heater recommendations
Fill Time
Estimate time to fill your pool
How to Calculate Pool Volume
Calculation Formula
Round: π × Radius² × Avg Depth × 7.5
Oval: Length × Width × Avg Depth × 5.9
Average Depth = (Shallow Depth + Deep Depth) / 2
Quick Reference
Pool Shapes Supported
Rectangle
Standard rectangular pool
ext{Length} imes ext{Width} imes ext{Average} ext{Depth} imes 7.5
Oval
Oval or elliptical pool
ext{Length} imes ext{Width} imes ext{Average} ext{Depth} imes 5.9
Round
Circular pool
\text{pi} imes ext{Radius}^{2} imes ext{Average} ext{Depth} imes 7.5
Kidney
Kidney-shaped pool
( ext{Length} A + ext{Length} B) imes ext{Width} imes ext{Average} ext{Depth} imes 0.45
Freeform
Custom freeform shape
ext{Length} imes ext{Width} imes ext{Average} ext{Depth} imes 6.7 (approximation)
L-Shaped
L-shaped pool
( ext{Length} A imes ext{Width} A + ext{Length} B imes ext{Width} B) imes ext{Average} ext{Depth} imes 7.5
Equipment Sizing Guide
| Pool Volume | Pump Size | Filter Size | Heater BTU |
|---|---|---|---|
| Up to 10,000 gallons | 0.75 HP | Small (16") | 100,000 |
| 10,000 - 20,000 gallons | 1.0 HP | Medium (18-20") | 200,000 |
| 20,000 - 30,000 gallons | 1.5 HP | Large (22-24") | 300,000 |
| 30,000 - 40,000 gallons | 2.0 HP | X-Large (26-30") | 400,000 |
| 40,000 - 60,000 gallons | 2.5 HP | Commercial (36"+) | 500,000 |
| 60,000+ gallons | 3.0 HP | N/A | 600,000 |
Chemical Dosing Guidelines
Per 10,000 Gallons
Maintenance Schedule
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