Bath vs Shower Cost Compare

The Bath vs Shower Cost Compare tool is a free online utility that automatically calculates the water and gas costs of your daily bathing routine, comparing the monthly and annual expense of taking a bath (soaking in a tub) versus showering only. A typical household bath uses around 200 liters of water per session, plus additional water for a post-bath shower rinse. Showering only, on the other hand, varies significantly in cost depending on duration and flow rate. A useful reference point: showering for about 18 minutes uses approximately the same amount of water as filling a bathtub.

This tool lets you input the bathtub volume (default 200L), shower duration and flow rate, water price per liter, gas price per liter of heated water, and the number of days per month. It then calculates in real time the water usage, water cost, gas cost, and total cost per session and per month for both bathing methods. The results also display the monthly savings, making it instantly clear which option is more economical and by how much. Default values are pre-configured with typical Japanese city gas and water rates, so you can get a rough estimate without changing any settings.

By adjusting the shower flow rate, you can estimate the cost impact of installing a water-saving showerhead on both a monthly and annual basis. Everything runs in your browser — no personal data or inputs are ever sent to a server. Ideal for anyone looking to cut utility bills, review living expenses for solo living, understand family bathing costs, or evaluate the financial benefit of water-saving fixtures.