Shower Valve Calculator
Size shower valves based on showerhead count, body sprays, flow rates, and water pressure. Determines thermostatic vs pressure-balance needs.
Inputs
Results
Total flow demand (GPM)
2
Valve port size (in.)
0.5
Thermostatic valve needed?0
Volume controls needed0
Supply pipe size (in.)0.5
Pressure at head (PSI)39
Pressure adequate?1
Valve cost estimate$80
Trim kit cost$150
Total valve + trim cost$230
How to Use This Calculator
- Enter the number of showerheads (fixed, rain, and handheld combined).
- Enter the number of body spray jets if your shower system includes them.
- Set the flow rate per showerhead in GPM — WaterSense-certified heads are 2.0 GPM or less.
- Enter your static water pressure in PSI (measure at the nearest hose bib).
- Check Thermostatic Valve Needed — if the result is 1, a thermostatic valve is recommended for your multi-outlet system.
- Use the Total Valve + Trim Cost to budget for the shower valve system before installation.
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