Shower Cost Calculator
Track how flow rate, shower length, and household routines impact your utility bills and water footprint.
Check the label on your showerhead or measure with a bucket.
Applies to electric or gas heaters (converted to kWh).
Cost Breakdown
Per shower
$0.51
16.8 gallons used
Monthly
$31.07
1,022 gallons / month
Annual
$372.80
12,263 gallons / year
Instructions
Measure flow rate
Fill a 1-gallon container and time it, or check the GPM rating etched on the showerhead base.
Count household showers
Estimate average showers per person per week. Include gym or evening rinses if they usually happen at home.
Adjust inputs to test savings
Change flow rates or shower duration to see the impact of efficient showerheads, timers, or mindful habits.
Formula
Gallons per Shower = Flow Rate × Minutes
Energy Cost = Gallons × (8.34 × ΔT ÷ 3412) × kWh Cost
Total Cost = Water Cost + Energy Cost
Monthly Cost = Per-Shower Cost × Showers/Month
Example: 2.1 gpm × 8 min = 16.8 gal. Water cost $0.015/gal → $0.25. Energy cost ≈ $0.26. Total ≈ $0.51 per shower.
Shower Efficiency Tips
Reducing shower costs is good for your wallet and the environment. Use these ideas to trim utility bills without sacrificing comfort.
- Switch to WaterSense showerheads (≤2.0 gpm) for instant savings.
- Install a shower timer or playlist to keep showers under a set duration.
- Capture warm-up water in a bucket for plants or cleaning.
- Lower water heater temperature to 120°F to reduce energy waste.
Common Questions
How do gas heaters factor in?
The calculator uses kWh cost. Convert your gas rate to kWh (1 therm ≈ 29.3 kWh) or approximate cost per gallon directly.
What about mixed hot/cold water?
The formula assumes complete heating of the total volume. For more precision, adjust by the fraction of hot water in your mix.
Can I include baths too?
Use the Bath vs Shower calculator to compare tub fills. You can combine results for a full bathing cost overview.
Does low water pressure change flow rate?
Yes—measure actual flow rather than relying only on the manufacturer rating, especially in older plumbing systems.