Calculate Liters in a Tub
Calculator, how many liters fit in a tub or vat with a flat bottom.
A tub or vat, as used in the past, often had a straight bottom and symmetrical shape. Zinc tubs are still sold in this form today. With such a tub, a simple calculation of the volume is possible. The floor and opening then have the shape of a bisected and then pulled apart circle, geometrically this is called a stadium. The walls are slanted, resulting in a general truncated cone.
The dimensions are measured at the fill level inside the tub.
Example: A bathtub is one meter long at the top and half a meter wide. The measurements below are 80 cm long and 40 cm wide. The height is 60 cm. Completely filled, almost 218 liters fit in the tub.
Please enter the height and three other values, the remaining value and the volume will be calculated.
Today, most bathtubs look different; their bottoms are rounded for comfort, and one end is more slanted than the other. Such shapes are difficult to calculate. To find out how much will fit into such a tub, you simply experiment, for example, pouring water into it until it's full. For example, if you fill a 5-liter bucket and pour water into the tub 40 times, then 200 liters will fit.
If you use this calculator, which is suitable for old tub shapes, to estimate modern, rounded shapes, you have to keep in mind that more content would fit into the old shape. If one end is more slanted than the other, you calculate the capacity it would have with two straight sides and then with two slanted sides, and take the average.
Generally, you don't fill bathtubs completely, because they're supposed to fit a person, and then the water would overflow. Other tubs can be filled completely, for example with potting soil, because old zinc tubs are often planted for decorative purposes and placed in the garden or on the terrace.
Last updated on 06/23/2025. Author: Jürgen Kummer
Here you can convert metric volume units into customary and imperial units.
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