Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Pool volume
16,860
Average depth (ft)
5.75
Pump flow for target turnover (GPM)
35
Gallons per inch of water level
244
Surface area (sq ft)
392
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter pool length (ft).
- 2Enter pool width (ft).
- 3Enter shallow end depth (ft).
- 4Enter deep end depth (ft).
- 5Enter target turnover time (hours).
- 6Read your pool volume on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
14 by 28 feet is one of the most common inground rectangular pool sizes, and knowing the gallonage is the starting point for every chemical dose, heater size, and pump turnover calculation you will ever do on it. Volume depends on average depth, not just surface area — a pool sloping from 3.5 feet in the shallow end to 8 feet in the deep end averages about 5.75 feet, not 8. This calculator computes average depth from your two end depths, returns total gallons, and shows the flow rate needed for an 8-hour turnover plus the gallons-per-inch figure that makes top-off and dosing math easy.
Worked example
Using the values the calculator loads with:
Inputs
- Pool length: 28 ft
- Pool width: 14 ft
- Shallow end depth: 3.5 ft
- Deep end depth: 8 ft
- Target turnover time: 8 hours
Results
- Pool volume: 16,860
- Average depth (ft): 5.75
- Pump flow for target turnover (GPM): 35
- Gallons per inch of water level: 244
- Surface area (sq ft): 392
What each field means
Inputs
- Pool length (ft)
- The pool length used in the calculation, measured in ft. Starts at 28 ft so you have a working example on load. Accepted range: 8–80 ft.
- Pool width (ft)
- The pool width used in the calculation, measured in ft. Starts at 14 ft so you have a working example on load. Accepted range: 6–40 ft.
- Shallow end depth (ft)
- The shallow end depth used in the calculation, measured in ft. Starts at 3.5 ft so you have a working example on load. Accepted range: 1–8 ft.
- Deep end depth (ft)
- The deep end depth used in the calculation, measured in ft. Starts at 8 ft so you have a working example on load. Accepted range: 2–14 ft.
- Target turnover time (hours)
- The target turnover time used in the calculation, measured in hours. Starts at 8 hours so you have a working example on load. Accepted range: 4–24 hours.
Results
- Pool volume
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Average depth (ft)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Pump flow for target turnover (GPM)
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gallons per inch of water level
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Surface area (sq ft)
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How many gallons is a 14x28 pool?
With a 3.5-to-8-foot slope the average depth is 5.75 feet, giving about 16,900 gallons. A flat 5-foot depth version holds roughly 14,700.
Why does turnover rate matter?
Health codes and filter manufacturers target circulating the entire pool volume every 6-8 hours so chemicals distribute evenly and debris reaches the filter. Undersized flow leaves dead spots and algae.
How do I use gallons per inch?
It tells you how much water an inch of evaporation or backwash costs, and it makes partial-drain and dilution math simple when you need to lower cyanuric acid or salt levels.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). 14x28 Inground Pool Gallons Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/14x28-inground-pool-gallons-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/14x28-inground-pool-gallons-calculator" target="_blank" rel="noopener">14x28 Inground Pool Gallons Calculator — RevenueLab</a> (2026).</p>
Source: [14x28 Inground Pool Gallons Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/14x28-inground-pool-gallons-calculator) (2026).