Bathtub Size & Volume Calculator
Bathtub Volume & Water Use
Calculate water capacity and usage for your bathtub
Standard Tub Size Finder
Find the right standard bathtub size for your bathroom
Formula
Volume (gallons) = (L × W × Depth × Shape Factor) / 231 | Fill Time = Gallons / Flow Rate (GPM)
Frequently Asked Questions
What is the standard bathtub size?
Standard alcove tub: 60" long × 30" wide × 14-16" deep. This fits a standard 5-foot bathroom alcove. Compact tubs (48"-54") are available for small bathrooms. Soaking tubs are 60"-72" with deeper water (17"-22").
How many gallons does a bathtub hold?
A standard bathtub holds 36-50 gallons when filled. Soaking tubs hold 60-80 gallons. Whirlpool/jacuzzi tubs can hold 80-110 gallons. For comparison, a typical shower uses 17-20 gallons.
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