Pipe Calculator – Lengths, Fittings & Waste

Instead of working from a supplier's ballpark figure, this calculator derives your pipes requirement from Total = Σ Runs × 1.1 + Fittings × Equiv. Length; Pieces = Total ÷ Stock Length using the exact fixture count and run lengths you provide. The arithmetic stays transparent: each result links back to the displayed formula, so you can audit any number. For instance: A 3-bathroom rough-in: 85 m of PEX + 45 m PVC - 10% waste lands 94 m and 50 m of stock. Keep in mind: Hot lines lose 1-2°C per 10 m - keep runs short or upsize one diameter. Quantities are rounded conservatively so offcuts, spillage and delivery shortages never stop work mid-job.

1. 1

   Take dimensions

   Note the fixture count and run lengths for the area you are covering or filling.

2. 2

   Run the calculation

   The calculator applies Total = Σ Runs × 1.1 + Fittings × Equiv. Length; Pieces = Total ÷ Stock Length the moment you type.

3. 3

   Check the breakdown

   Compare base quantity and waste-adjusted totals side by side.

4. 4

   Plan the purchase

   Use the final figure to price and schedule the delivery.

• Mixing pipe standards

• Underestimating bends

• Skipping scaffold ties