Test Tube Volume Calculator

How to Use the Calculator

1. Enter the diameter of your test tube in centimeters (cm). This is the width of the test tube opening.
2. Enter the length of your test tube in centimeters (cm). This is the total height of the test tube.
3. Enter the height of the liquid in your test tube in centimeters (cm). This is how high the liquid is from the bottom of the test tube.
4. Click the "Calculate" button to compute the volume of liquid in the test tube.
5. The results will include the radius of the test tube, its cross-sectional area, and the volume of liquid.

Understanding the Formula

The calculator uses the formula for the volume of a cylinder:

Volume = π × (radius²) × height

Where:

• π (pi) is a mathematical constant approximately equal to 3.14159
• radius is half the diameter of the test tube
• height is the liquid height

Example

If you have a test tube with a diameter of 1.0 cm and a length of 10 cm, and the liquid level is at 5 cm:

• Radius = 1.0 cm / 2 = 0.5 cm
• Cross-sectional Area = π × (0.5 cm)² = π × 0.25 cm² ≈ 0.79 cm²
• Liquid Volume = 0.79 cm² × 5 cm ≈ 3.96 cm³