In short: at typical U.S. rates, an 8-minute shower with a 2.1 GPM showerhead and an electric water heater costs about $0.57 — roughly $0.18 for water and sewer and $0.39 for the electricity to heat it. For a household of three showering once a day, that works out to about $52 a month, or $627 a year. Enter your own rates, heater and habits above for a number based on your home.
These are planning estimates from typical fixture flow rates, national-average energy prices and standard heater efficiencies. Your water and energy bills are the true measure — use them to fine-tune the rates above.
How the cost is calculated
Every shower has two costs: the water itself (and its sewer charge, if billed), and the energy to heat it. The calculator adds them together:
shower cost = water cost + heating cost
Water cost is just the gallons used times your combined water-and-sewer rate. Heating cost comes from the physics of raising water's temperature: the energy needed is mass × specific heat × temperature rise, converted to kilowatt-hours and then divided by your water heater's efficiency before it's priced at your electricity or gas rate.
Worked example (the calculator's defaults). A shower runs a 2.1 GPM showerhead for 8 minutes: 2.1 × 8 = 16.8 gallons. At a combined water and sewer rate of $11.00 per 1,000 gallons, that's 16.8 × 0.011 = $0.185, which rounds to $0.18 for water and sewer.
Heating those 16.8 gallons (about 63.6 kg) from 55°F to 105°F is a 50°F (27.8°C) rise. Using water's specific heat of 4,186 J/(kg·K), that takes about 7.39 million joules — 7,390,000 ÷ 3,600,000 ≈ 2.05 kWh of heat delivered to the water. An electric tank water heater running at 90% efficiency needs 2.05 ÷ 0.90 ≈ 2.28 kWh of electricity, which costs 2.28 × $0.17 ≈ $0.39 at a national-average residential rate.
Total: $0.18 + $0.39 = $0.57 per shower — about $52 a month for three people showering once a day.
Why water heating usually costs more than the water
In most of the country, treated water and sewer service is inexpensive per gallon, but raising its temperature is not — heat is energy, and energy has a real price per kilowatt-hour or therm. Three things drive the heating share of the bill: how many degrees you raise the water, how efficiently your heater turns fuel into hot water, and your local energy price.
Incoming water temperature swings with the seasons and your region — often 40–50°F in a northern winter and 65–75°F in a warm-climate summer. A bigger temperature rise means more energy, and the same shower can cost noticeably more to heat in January than in July even with identical flow and duration. Heater type matters just as much: electric resistance tanks convert electricity to heat at close to 100% efficiency, but electricity itself is priced high per unit of heat delivered; gas storage tanks lose more heat up the flue (efficiencies around 55–65%) but gas is priced low per therm, so the total is often cheaper. Heat pump water heaters move heat rather than generate it, so they can deliver the equivalent of 250–350% efficiency on an electric bill — see the comparison below.
To see your water use on its own, without the heating cost, try the shower water usage calculator; to check your showerhead's actual flow, use the shower flow rate calculator.
Cost per shower by water heater type
Same shower every time — 16.8 gallons, a 50°F temperature rise, and a $11.00-per-1,000-gallon combined water and sewer rate. Only the heater changes.
| Heater type | Efficiency | Energy price | Heating cost | Total cost / shower |
|---|---|---|---|---|
| Electric storage tank | 90% | $0.17/kWh | $0.39 | $0.57 |
| Electric tankless | 95% | $0.17/kWh | $0.37 | $0.55 |
| Gas storage tank | 60% | $1.20/therm | $0.14 | $0.33 |
| Gas tankless | 82% | $1.20/therm | $0.10 | $0.29 |
Water and sewer cost of $0.18 is included in every total. Your own efficiency and price will differ — use the heater efficiency and energy price fields above for a figure specific to your equipment.
A few real-world scenarios
Quick low-flow shower
$0.17 / shower
One person, a 5-minute shower with a 2.0 GPM WaterSense showerhead, a 60%-efficient gas storage water heater at $1.20/therm, warming 58°F water to 104°F. About $5.08 a month.
Default household
$1.72 / day
Three people, one 8-minute shower each per day at 2.1 GPM, electric tank at 90% efficiency and $0.17/kWh, 55°F to 105°F. About $52.30 a month, $627 a year.
Old showerhead, cold climate
$3.64 / day
Four people, 10-minute showers at the old federal-max 2.5 GPM, electric heater, and a 55°F temperature rise from cold groundwater. About $110.80 a month, $1,328.76 a year — nearly double the default household.
What else affects the number
Pipe and standby losses. Water heated in a tank loses some heat while it sits, and hot water cools as it travels through pipes to the shower — both add a small, hard-to-generalize amount to real-world cost that this calculator doesn't separately model.
Tiered or seasonal rates. Many utilities charge more per gallon above a threshold, or raise rates in summer. If your bill uses tiered pricing, use your highest applicable tier's rate here for a conservative estimate, or check the water rate tier calculator for a full breakdown.
Well water and septic systems. Setting both rates to $0 removes utility charges, but a well pump still uses electricity — see the pump energy cost calculator to estimate that separately.
Combined billing with baths and other fixtures. This tool isolates showers. For your full monthly water bill across every fixture, use the water bill calculator; to compare a bath instead, see the bath cost calculator.
Frequently asked questions
How much does a shower actually cost?
At typical U.S. rates, an 8-minute shower with a 2.1 GPM showerhead and an electric water heater costs about $0.57 — roughly $0.18 for water and sewer and $0.39 for the electricity to heat it. Your own number depends heavily on your water rate, heater type and efficiency, and how much you raise the water's temperature.
Does the water heater matter more than the water itself?
Usually, yes. In the default example above, heating the water costs more than twice as much as the water and sewer charges combined. Electric resistance heating is typically the most expensive way to heat shower water; gas and heat-pump water heaters usually cost less per shower for the same flow and temperature rise.
Why does my incoming water temperature matter?
Heating cost depends on how many degrees you raise the water, not just its final temperature. Groundwater and tap water run colder in winter than summer, so the same shower can cost noticeably more to heat in January than in July, even with identical flow, duration and target temperature.
How can I lower the cost without a shorter shower?
Switching to a WaterSense showerhead (2.0 GPM or less) cuts both the water volume and the energy needed to heat it. Lowering the target temperature a few degrees, insulating hot-water pipes, and improving water heater efficiency (tankless or heat pump models) also reduce cost without changing how long you shower.
Does this include the cost of a well pump?
No — this tool assumes a metered water and sewer utility. If you're on a private well, set the water and sewer rates to $0 and use the pump energy cost calculator separately to estimate what running your well pump adds to each shower.
Sources & references
- U.S. Environmental Protection Agency (EPA). WaterSense: Showerheads.
- U.S. Energy Information Administration (EIA). Average residential electricity and natural gas prices.
- U.S. Department of Energy. Energy Saver: Water Heating — storage, tankless and heat pump efficiency (UEF).
Sarah Bennett, MS
Water Quality & Sustainability Specialist · Portland, Oregon
Environmental scientist (MS, Water Resources) with 9+ years in residential water quality, treatment, and usage efficiency, and 150+ completed assessments. Sarah writes and reviews the treatment, usage, and cost calculators on watercalculator.us. Read full bio
MS Environmental Science, Water Resources (2018) · BS Environmental Engineering (2016)