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Shower Cost Calculator

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

Shower cost

Electric mode uses the entered electricity price and a DOE planning factor. The default price is an editable example, not a local tariff.

Cost per shower$0.75

21 gallons at the entered shower length and flow rate.

Cost per minute$0.075

Water, sewer, and the selected water-heating estimate per shower minute.

Monthly shower cost$22.81

147 gallons per week at the entered shower count.

Cost by shower length

Compares common shower lengths using the same flow rate and utility prices.

MinutesGallonsCost
510.5 gal$0.38
1021 gal$0.75
1531.5 gal$1.13
3063 gal$2.26
4084 gal$3.01
60126 gal$4.51
Shower cost breakdown

Electric water heating uses a DOE planning factor of 148.8 kWh per 1,000 gallons. Actual heater efficiency and temperatures vary.

PartEstimate
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.

Formula

Shower cost formula

Cost per shower = water volume x water rate + water volume x selected heating rate

Water 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

Steps

  1. Enter average shower length in minutes.
  2. Choose US or metric units, then enter the showerhead flow rate.
  3. Enter showers per week and your water plus sewer rate.
  4. Choose electric heating and enter a price per kWh, or choose a custom volume rate for another heater type.
  5. Compare the current result with common shower lengths.

Example

Sample calculation

Shower length10 minutes
Flow rate2.1 gal/min
Water use21 gallons
Estimated costAbout $0.75/shower

Calculator use

Best for

  • Estimating home utility cost, shared bills, appliance usage, or service charges before splitting or budgeting.
  • Testing usage changes such as shorter showers, different appliance cycles, rate changes, or roommate shares.

Before relying on it

Check first

  • Leaving out fixed service fees, tiered rates, taxes, delivery charges, minimum bills, seasonal rates, or billing-period length.
  • Using appliance labels, averages, or old bills without checking actual runtime, local rates, and household usage.
  • Splitting a bill without agreeing whether fixed fees, shared rooms, guests, or unequal usage should be weighted.

Details

What to know before using the result

Water useMinutes x flow rate

A longer shower or higher-flow showerhead raises gallons used directly.

Cost per minuteDuration-scaled estimate

Water and hot-water energy both scale with minutes, so longer shower comparisons use the same transparent assumptions.

Hot-water energyElectric or custom rate

Electric mode uses a generalized DOE planning factor. Custom mode accepts a bill-derived volume rate for gas, propane, heat-pump, or other systems.

Duration comparison5 to 60 minutes

The comparison table answers common shower-length questions without changing the entered flow rate or utility prices.

Source notes

References used for this calculator

EPA WaterSenseExplains standard and WaterSense showerhead flow rates plus shower water-use context.EPA WaterSenseExplains household water use context for estimating water-related utility costs.U.S. Department of EnergyProvides the generalized shower water-energy equivalence used only by the calculator's electric-heating mode.

Benchmarks

How to read the result

Under 10 gal / 38 L: Short/low-flow.

More likely with short showers and lower-flow showerheads.

15 - 30 gal / 57 - 114 L: Common planning range.

Useful for checking how minutes and flow rate move household water use.

30+ gal / 114+ L: High use.

Longer showers or higher flow rates can add up across a household.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Cost per shower = water volume x water rate + water volume x selected heating rate

Inputs used

Minutes per shower, Water flow rate, Showers per week, Water rate, Water-heating method

Limitations

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.

Review record

Page and function checked on August 4, 2026. The page copy, inputs, result behavior, and visible assumptions were checked together on this date.

Cite this page

Toolkit Shelf. Shower Cost Calculator. https://toolkitshelf.com/tools/shower-cost-calculator

FAQ

Common questions

How do I calculate gallons used in a shower?

Multiply shower minutes by the showerhead flow rate in gallons per minute.

How is hot-water energy estimated?

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.

How much does a 40 or 60-minute shower cost?

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.

Does this include sewer cost?

Yes, if you include sewer in the water rate per 1,000 gallons.