1. What Is This Calculator For?

This calculator determines the volume capacity of 1/2 inch PEX tubing in gallons per foot. It helps plumbers, contractors, and DIY enthusiasts calculate how much fluid a specific length of tubing can hold.

2. How Does The Calculator Work?

The calculator uses the formula for cylinder volume:

Where:

• \( \pi \) — Mathematical constant (approximately 3.1416)
• \( Diameter \) — Inner diameter of the tubing (0.5 inches for 1/2" PEX)
• 12 — Conversion factor from inches to feet
• 7.48 — Conversion factor from cubic feet to gallons

Explanation: The formula calculates the cross-sectional area of the tubing and converts it to gallons per linear foot.

3. Importance Of Calculating Tubing Capacity

Details: Knowing the capacity of PEX tubing is essential for system design, calculating fill times, determining system volume for treatment chemicals, and ensuring proper flow rates in plumbing systems.

4. Using The Calculator

Tips: Enter the length of tubing in feet. The calculator will provide both the gallons per foot and total capacity for the specified length.

5. Frequently Asked Questions (FAQ)

Q1: Does this calculation account for tubing wall thickness?
A: No, this calculation uses the inner diameter of standard 1/2" PEX tubing. Actual capacity may vary slightly between manufacturers.

Q2: Can I use this for other tubing sizes?
A: This calculator is specifically for 1/2" PEX. For other sizes, you would need to adjust the diameter value in the formula.

Q3: Why convert to gallons?
A: Gallons are a standard measurement for liquid volume in plumbing applications in the United States.

Q4: How accurate is this calculation?
A: The calculation is mathematically precise for perfect cylinders. Real-world factors like tubing ovality or manufacturing tolerances may cause slight variations.

Q5: Can this be used for hot and cold water lines?
A: Yes, the calculation is the same regardless of water temperature, though expansion at higher temperatures may slightly affect capacity.