Bathtub Fill Time & Water Cost Calculator
Curious how long a bath takes to fill and what it actually costs? Enter your tub's volume, faucet flow rate, target water temperature, and local utility rates to get fill time and cost per bath.
Fill Time (minutes)
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Gallons Used—
Water Cost ($)—
Heating Cost ($)—
Total Cost per Bath ($)—
About this calculator
Calculate how long it takes to fill your bathtub and the cost of the water and energy to heat it, based on tub size, faucet flow rate, and water/energy prices.
Frequently Asked Questions
How long does it take to fill a bathtub?
It depends on tub volume and faucet flow rate — a 40-gallon tub filled at 4 gallons per minute takes about 10 minutes to fill three-quarters full.
How much does a bath cost in water and energy?
Most baths cost between $0.50 and $2, combining water utility charges with the electricity or gas used to heat the water.
Does a shower use less water than a bath?
Typically yes — a 10-minute shower at 2 gallons per minute uses about 20 gallons, versus 30-40 gallons for a full bath.