Shower Cost Calculator
Enter your shower duration, showerhead flow rate, heater type, and local utility rates to find out exactly what each shower costs you in water and energy. Results update instantly and include a daily, monthly, and yearly cost breakdown so you can see where your utility money goes.
How the shower cost is calculated
Your shower cost has two components: water and sewer charges, and the energy used to heat that water. The water cost is simply the volume of water used (flow rate multiplied by shower duration) times your local water and sewer rate. The heating cost requires a few more steps: first, we calculate the BTUs needed to raise the cold inlet water to your desired shower temperature using the formula BTU = gallons x 8.34 x temperature rise in Fahrenheit. We then divide by your heater's Energy Factor to account for efficiency losses, convert the result to the correct energy unit (kWh for electric heaters, therms for gas), and multiply by your energy rate. Heating the water typically makes up 60-80% of the total shower cost, which is why your heater type and efficiency matter more than most people realize.
Which water heater type is cheapest for showers?
Heat pump water heaters (also called hybrid electric) are the most efficient option for most homes, using 60-70% less electricity than a standard electric tank by pulling heat from the surrounding air. Tankless gas heaters are efficient and eliminate standby losses, but their advantage depends heavily on local gas versus electricity prices. Standard electric tank heaters are the most common but the least efficient because they lose heat through the tank walls even when no hot water is being used. Natural gas tanks sit in the middle ground: cheaper per BTU than electricity in most US markets, but less efficient than a heat pump. If your goal is to minimize long-term shower costs, upgrading to a heat pump water heater is typically the single highest-impact change you can make, often saving $300-600 per year on a whole-household basis.
How to reduce your shower costs
The three biggest levers for cutting shower costs are shower duration, flow rate, and heater type. Cutting a 10-minute shower to 8 minutes saves about 20% instantly. Replacing a 2.5 gpm showerhead with a 2.0 gpm WaterSense-certified head reduces water and heating costs by 20% with no change to shower time. Lowering your water heater thermostat from 140 F to 120 F reduces standby heat loss and protects against scalding without noticeably affecting shower comfort. Less obvious wins include insulating hot water pipes (reduces the cold-water purge before hot water arrives) and fixing dripping faucets (a slow drip from a hot tap can waste hundreds of gallons monthly).
Bath vs. shower: which costs more?
A typical bathtub holds 35-50 gallons. A standard 8-minute shower at 2.0 gpm uses about 16 gallons, less than half the water of a full bath. Even a 15-minute power shower at 3.0 gpm (45 gallons) is roughly equal to a bath in volume. For most people, showers are significantly cheaper than baths, unless you take very long showers with a high-flow head. The exact comparison depends on your specific setup, which is why a bath vs. shower calculator (linked in the related tools below) can be useful if you are trying to choose the cheapest option for your household.
Showerhead efficiency and typical flow rates
| Showerhead type | Typical flow (gpm) | Annual water savings vs. 2.5 gpm* | Cost tier |
|---|---|---|---|
| Ultra low-flow (WaterSense+) | 1.5 | ~7,000 gal | Lowest |
| Low-flow (WaterSense) | 2.0 | ~3,600 gal | Low |
| Standard (current code max) | 2.5 | Baseline | Moderate |
| Rain/multi-spray | 3.5-4.0 | -13,000 to -18,000 gal | High |
| Power/massage head | 4.0-5.0 | -18,000 to -36,000 gal | Highest |
WaterSense and EPA categories. Lower flow rates cut both water and heating costs.
Frequently asked questions
How much does the average shower cost?
In the United States, the average 8-minute shower at 2.0 gpm with an electric water heater costs roughly $0.35-$0.55, or about $130-$200 per person per year. The exact figure depends on your local water rate, electricity or gas rate, heater type, and showerhead flow rate. You can find your own number by entering your actual rates in this calculator.
Why does heating cost more than the water itself?
Heating water takes a significant amount of energy. Raising 16 gallons of water (an 8-minute shower at 2 gpm) from 55 F to 105 F requires about 0.55 kWh of heat energy. At a typical US electricity rate of $0.135/kWh, that costs about $0.07-$0.10 just in electricity, while the water itself might cost only $0.08 at average US rates. With a standard electric heater at 92% efficiency, the heating cost alone is already competitive with the water cost. In colder climates or with a less efficient heater, heating can be 3-5 times the water bill.
What flow rate should I enter if I do not know my showerhead?
A simple test: hold a bucket under your showerhead for exactly 10 seconds, then multiply the volume collected by 6 to get gallons per minute. Any bucket marked in cups or quarts works fine (4 cups = 1 quart = 0.25 gallons). Most showerheads sold in the US since 1994 are limited to 2.5 gpm by federal law. WaterSense certified heads run at 2.0 gpm or less. If you skip the test, 2.0-2.5 gpm is a safe default for most US households.
What is an Energy Factor (EF) and where do I find mine?
The Energy Factor (now called Uniform Energy Factor, or UEF) measures how efficiently a water heater converts energy into hot water. A higher number means less waste. Electric tank heaters typically have a UEF around 0.90-0.95; gas tanks around 0.62-0.70; tankless electric 0.97-0.99; tankless gas 0.82-0.95; and heat pumps 2.0-3.5. You can find your heater's UEF on the yellow EnergyGuide label on the unit or by searching the model number on the Department of Energy's appliance database.
Does a cold shower cost less?
Yes, significantly. All of the heating cost disappears if you shower entirely in cold water. A cold 8-minute shower at 2.0 gpm costs only the water and sewer charge, roughly $0.08 at average US rates, compared to $0.35-$0.55 for a hot shower. Most people mix hot and cold water to reach a comfortable temperature, so the actual saving depends on how much hot water you use. Reducing the shower temperature even a few degrees (from 108 F to 100 F, for example) meaningfully cuts the temperature rise and therefore the energy cost.
How do I find my water rate?
Your water rate appears on your monthly water bill, usually as a cost per 1,000 gallons or per CCF (100 cubic feet = 748 gallons). Divide the cost per 1,000 gallons by 1,000 to get the cost per gallon. For example, $7.50 per 1,000 gallons is $0.0075 per gallon. Remember to include the sewer or wastewater charge if it appears on the same bill, as it often equals or exceeds the water charge and is just as real a cost of running water down the drain.