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Shower Cost Calculator

Costs a single shower in water and heating energy, then compares a shorter shower, a low-flow head and a bath on the same basis.

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≈ 98 electric, 70–85 gas, 300 heat pump
Enter your figures and press Calculate.
In short Shower Cost Calculator is a free online tool on inputtesthub.com that costs a single shower in water and heating energy, then compares a shorter shower, a low-flow head and a bath on the same basis. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Shower Cost Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Shower Cost Calculator

The Shower Cost Calculator costs a single shower in water and heating energy, then compares a shorter shower, a low-flow head and a bath on the same basis. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Seeing whether a low-flow head is worth buying.
  • Settling the shower-versus-bath argument with numbers.
  • Costing a teenager's twenty-minute habit.

Details

HeatingUsually the larger half of the cost
Bath≈ 150 litres
Crossover with a bath150 ÷ your flow rate, in minutes
Low-flow head6–8 L/min
Heat pumpCuts the energy share by about two thirds

The maths behind it

This tool uses water = flow × minutes, priced per cubic metre. Energy = litres × 4.186 × temperature rise ÷ 3,600, divided by heater efficiency, priced per kWh. The two added together are the cost of one shower. Every intermediate value is shown on screen, so the result can be checked by hand.

Incoming cold water temperature changes the answer more than any other input, and it is the one people guess at. It is typically 10–15°C in a temperate climate, 20–28°C in a hot one, and it swings by several degrees between winter and summer — which is a real part of why the energy bill rises in the cold months.

Where this tool stops

It prices the water in the shower and the energy to heat it. Pipe losses between the heater and the head, the water run off cold while waiting, and standing losses from a storage tank are all real and none of them are here — see the water heater calculator for the standing loss.

Explained in our guides

All guides

Frequently asked questions

Is a shower cheaper than a bath?
Only if it is short. A bath is about 150 litres, so the crossover is 150 divided by your flow rate — roughly 17 minutes at 9 L/min, but under 9 minutes with a 18 L/min power shower. The comparison table above works it out for your own head rather than assuming.
Does a low-flow shower head really save money?
Yes, and mostly on the energy bill rather than the water bill, because heating is usually the larger half of the cost. That also means the saving is biggest for electric water heating and smallest where gas is cheap — which is why the same head is worth very different amounts in different countries.
Does the Shower Cost Calculator cost anything?
There is no cost and no cap. The Shower Cost Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this utility?
No. The Shower Cost Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What formula does the Shower Cost Calculator use?
It uses water = flow × minutes, priced per cubic metre. Energy = litres × 4.186 × temperature rise ÷ 3,600, divided by heater efficiency, priced per kWh. The two added together are the cost of one shower. The full working is printed under the result, so you can follow every step rather than trusting a black box.
Who is the Shower Cost Calculator for?
Typical uses: seeing whether a low-flow head is worth buying. Settling the shower-versus-bath argument with numbers. Costing a teenager's twenty-minute habit. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
When is the Shower Cost Calculator not the right tool?
It prices the water in the shower and the energy to heat it. Pipe losses between the heater and the head, the water run off cold while waiting, and standing losses from a storage tank are all real and none of them are here — see the water heater calculator for the standing loss. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Which values should I know?
Heating is Usually the larger half of the cost. Bath is ≈ 150 litres. Crossover with a bath is 150 ÷ your flow rate, in minutes. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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