Toolkit ShelfEveryday Calculators
Estimate water use and cost per shower in gallons or liters, choose electric or custom water-heating costs, and compare 5, 10, 15, 30, 40, and 60-minute showers.
Live calculator
Electric mode uses the entered electricity price and a DOE planning factor. The default price is an editable example, not a local tariff.
21 gallons at the entered shower length and flow rate.
Water, sewer, and the selected water-heating estimate per shower minute.
147 gallons per week at the entered shower count.
Compares common shower lengths using the same flow rate and utility prices.
| Minutes | Gallons | Cost |
|---|---|---|
| 5 | 10.5 gal | $0.38 |
| 10 | 21 gal | $0.75 |
| 15 | 31.5 gal | $1.13 |
| 30 | 63 gal | $2.26 |
| 40 | 84 gal | $3.01 |
| 60 | 126 gal | $4.51 |
Electric water heating uses a DOE planning factor of 148.8 kWh per 1,000 gallons. Actual heater efficiency and temperatures vary.
| Part | Estimate |
|---|---|
| Water and sewer | $0.25 |
| Electric water heating | $0.50 (3.12 kWh) |
| Total per shower | $0.75 |
| Weekly total | $5.26 |
| Annual total | $273.72 |
Utility estimates depend on local rates, fixed fees, taxes, runtime, billing period, and household usage. Compare against the actual bill before settling up.
Quick answer
Shower Cost Calculator calculates shower cost from minutes per shower, water flow rate, showers per week, water rate, and water-heating method. The visible formula is Cost per shower = water volume x water rate + water volume x selected heating rate.
Formula
Cost per shower = water volume x water rate + water volume x selected heating rateWater volume equals shower minutes times flow rate. Electric mode derives a heating rate from the U.S. Department of Energy's generalized shower energy factor and the entered electricity price. Custom mode uses your bill-derived heating cost per 1,000 gallons or cubic meter.
How to use
Example
Calculator use
Before relying on it
Details
A longer shower or higher-flow showerhead raises gallons used directly.
Water and hot-water energy both scale with minutes, so longer shower comparisons use the same transparent assumptions.
Electric mode uses a generalized DOE planning factor. Custom mode accepts a bill-derived volume rate for gas, propane, heat-pump, or other systems.
The comparison table answers common shower-length questions without changing the entered flow rate or utility prices.
Source notes
Benchmarks
More likely with short showers and lower-flow showerheads.
Useful for checking how minutes and flow rate move household water use.
Longer showers or higher flow rates can add up across a household.
Calculator accuracy
Cost per shower = water volume x water rate + water volume x selected heating rate
Minutes per shower, Water flow rate, Showers per week, Water rate, Water-heating method
Utility pages use visible usage and rate assumptions. Actual bills may include tiers, service fees, delivery charges, taxes, minimums, seasonal rates, and provider-specific rules.
Page and function checked on August 4, 2026. The page copy, inputs, result behavior, and visible assumptions were checked together on this date.
Toolkit Shelf. Shower Cost Calculator. https://toolkitshelf.com/tools/shower-cost-calculator
FAQ
Multiply shower minutes by the showerhead flow rate in gallons per minute.
Electric mode multiplies a generalized shower-energy planning factor by your electricity price. For gas, propane, heat-pump, or another system, choose Custom rate and enter a bill-derived water-heating cost per volume.
Use the cost-by-length table to compare 40 and 60-minute showers with the same flow rate, water and sewer rate, and energy price entered above.
Yes, if you include sewer in the water rate per 1,000 gallons.
Page feedback
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