How to Measure a Bathtub and What Dimensions Are Needed

Tools You Need

Before starting the measurement, prepare the necessary tools: a tape measure, a pencil, and a piece of paper to record the measurements. You may also need a level to ensure accurate measurements. Having these tools on hand will simplify the process and help you obtain precise results.

Overall Dimensions

Overall dimensions refer to the external size of the bathtub, mainly including length and width. To measure the overall dimensions, place one end of the tape measure at one end of the bathtub (the starting point) and extend it to the other end (the ending point). Measure both the length and width at their widest points, ensuring the tape measure is straight and level. Write down the measurements in inches or centimeters. The accuracy of the overall dimensions determines whether the bathtub can be comfortably installed in the intended space.

Internal Dimensions

Internal dimensions are as important as overall dimensions, as they determine the usable space inside the bathtub. These typically include length, width, and depth. The internal length and width measurements are similar to the overall dimensions but note the starting and ending points, usually referencing the curves. The internal depth is the distance from the bottom of the bathtub (where you sit) to the top edge. Place the tape measure at the bottom and extend it to the top edge.

Soaking Depth

Soaking depth is an often overlooked or confused point. To better provide product information and avoid extra costs and time due to wrong purchases, Giving Tree Home provides both internal depth and soaking depth. Internal depth has been explained, while soaking depth is the distance from the bottom to the overflow drain. Once the water reaches the overflow drain, it won’t continue to rise. Measure the internal depth first, then measure the distance from the overflow drain to the top, and calculate the difference between the two.

Standards and Guidelines

When selecting a bathtub, you can usually see the retailer's dimension specification diagram for the bathtub. You need to compare it with your measurements to see if it fits. For alcove bathtubs, measure the distance between the three surrounding walls. If the walls are unfinished, consider the wall studs. Drop-in and undermount bathtubs require measuring the opening or platform for installation to ensure there’s enough space. Freestanding bathtubs need measuring the surrounding space to ensure there’s enough room for cleaning and maintenance.

Consider the surrounding space when measuring the bathtub. Measure the installation area, including the distance to walls, adjacent fixtures, and the height to the ceiling (if applicable). This ensures the bathtub fits the bathroom layout and leaves enough space for cleaning and maintenance. Additionally, measure the distance from the bathtub drain to the plumbing connection to ensure it aligns with existing fixtures. Retailers often provide recommended clearance distances and installation guides to ensure the bathtub fits the designated space and aligns with the plumbing.

Accurate Measurements

Accurate measurements are crucial to avoid unexpected issues during installation. Here are some tips:

• Measure twice to confirm the readings
• Ensure the tape measure is straight and not bent
• Use a level to check if the measurements are on a plane
• Clearly record all measurements and double-check before making any purchasing decisions

Avoiding Pitfalls

When measuring the bathtub, avoid these common pitfalls:

• Forgetting to measure both external and internal dimensions
• Ignoring the space needed for installation and maintenance
• Not considering the slope of the bathtub floor, which affects depth measurement
• Relying on old dimensions without rechecking