Hammer CalculatorPlumbing
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Size pipes, water heaters, pumps, and drainage systems for residential and light-commercial projects. Proper sizing prevents low water pressure, noisy pipes, and premature equipment failure — these tools do the math so your plumbing works right from day one.
Quick Tips
- Size supply pipes based on fixture count and simultaneous demand, not just the distance to the water main.
- Maintain a minimum 1/4" per foot slope on drain lines to ensure proper flow and prevent clogs.
- Tankless water heaters need a higher gas-line capacity than tank models — verify your gas supply before upgrading.
- Install water hammer arrestors near quick-closing valves (dishwashers, washing machines) to protect pipes.