Pool Turnover Rate Calculator
ANA›Life Services Authority›National Calculator Authority›Pool Turnover Rate Calculator
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# Pool Turnover Rate Calculator
The pool turnover rate is the time required for the pump and filtration system to circulate a volume of water equal to the entire pool. Most state and local health codes require a turnover rate of 6 to 8 hours for public pools. Enter your pool volume and pump flow rate below to determine whether your system meets code requirements.
Pool Volume (gallons)
Pump Flow Rate (GPM – gallons per minute)
Target Turnover Time (hours) (optional – default 6 hrs)
Calculate Turnover Rate Enter your pool volume and pump flow rate above, then click Calculate.
function ptrCalculate() { var volumeEl = document.getElementById('ptr-pool-volume'); var flowEl = document.getElementById('ptr-flow-rate'); var targetEl = document.getElementById('ptr-target-turnover'); var resultEl = document.getElementById('ptr-result');
var volume = parseFloat(volumeEl.value); var flowGPM = parseFloat(flowEl.value); var target = parseFloat(targetEl.value) || 6;
// --- Validation --- if (isNaN(volume) || volume ⚠ Please enter a valid pool volume greater than 0 gallons.'; return; } if (isNaN(flowGPM) || flowGPM ⚠ Please enter a valid pump flow rate greater than 0 GPM.'; return; } if (target 24) { resultEl.innerHTML = '⚠ Target turnover time must be between 1 and 24 hours.'; return; }
// --- Core Calculations --- // Turnover time (hours) = Pool Volume (gal) / (Flow Rate (GPM) × 60 min/hr) var turnoverHours = volume / (flowGPM * 60); var turnoverMinutes = turnoverHours * 60;
var turnoverHoursWhole = Math.floor(turnoverHours); var turnoverMinRemainder = Math.round((turnoverHours - turnoverHoursWhole) * 60);
// Turnovers per day = 24 / turnoverHours var turnoversPerDay = 24 / turnoverHours;
// Required GPM to meet target turnover // Required GPM = Pool Volume / (Target Hours × 60) var requiredGPM = volume / (target * 60);
// Flow rate in GPH var flowGPH = flowGPM * 60;
// Status check var meetsCode = turnoverHours '; html += 'ParameterValue';
html += 'Pool Volume' + '' + volume.toLocaleString() + ' gal';
html += 'Pump Flow Rate' + '' + flowGPM.toFixed(1) + ' GPM (' + flowGPH.toLocaleString(undefined,{maximumFractionDigits:0}) + ' GPH)';
html += 'Turnover Time' + '' + turnoverHours.toFixed(2) + ' hrs' + ' (' + turnoverHoursWhole + ' hr ' + turnoverMinRemainder + ' min)';
html += 'Turnovers per Day (24 hrs)' + '' + turnoversPerDay.toFixed(2) + ' turnovers/day';
html += 'Required GPM for ' + target + '-hr Turnover' + '' + requiredGPM.toFixed(1) + ' GPM';
html += '';
html += '' + statusIcon + ' ' + statusMsg + '';
if (!meetsCode) { html += 'To achieve a ' + target + '-hour turnover for a ' + volume.toLocaleString() + '-gallon pool, your pump must deliver at least ' + requiredGPM.toFixed(1) + ' GPM. Your current pump delivers ' + flowGPM.toFixed(1) + ' GPM, which is ' + (requiredGPM - flowGPM).toFixed(1) + ' GPM short.
'; }
resultEl.innerHTML = html; }
#### Formulas Used
Turnover Time (hours)
Turnover Time = Pool Volume (gal) ÷ (Flow Rate (GPM) × 60)
Required Flow Rate to Meet Target Turnover
Required GPM = Pool Volume (gal) ÷ (Target Turnover Hours × 60)
Turnovers per Day
Turnovers per Day = 24 ÷ Turnover Time (hours)
Where 60 converts minutes to hours (60 min/hr). Pool volume is in US gallons and flow rate is in gallons per minute (GPM).
#### Assumptions & Notes
- Flow rate entered is the effective flow rate at the filter, accounting for head loss through plumbing, valves, and the filter itself — not the pump's rated maximum.
- The default target turnover of 6 hours reflects the stricter end of typical public pool health codes (MAHC, PHTA, and most state regulations require 6–8 hours).
- This calculator assumes continuous pump operation. If the pump runs fewer than 24 hours per day, adjust the flow rate proportionally or consult a pool professional.
- Consult your local health authority or the Model Aquatic Health Code (MAHC) for jurisdiction-specific requirements.
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