Trade Tools - Free tool for Construction
Pipe, concrete, electrical & tile calculators — free
Trade Tools - Free tool for Construction launched on May 25, 2026 with 3 votes, #3,449 of 20,538 launches that month and more than 50% of that year's launches.
What it does
8 free calculators for plumbers, electricians, tilers and DIYers. Pipe sizing, concrete volume, electrical load, wire gauge, roof pitch, tile quantity, paint coverage and stud spacing. No login, no ads, metric and imperial, works offline. Also available in Spanish, French and German.
Free pipe size calculator for water supply, irrigation and service lines. Hazen-Williams formula. Instantly calculate pipe diameter, velocity and pressure drop for PVC, PEX, copper and more. Imperial and metric.
Results are for guidance only. Always verify with a qualified professional. About · Contact · Disclaimer Water supply lines: 2–4 ft/sec ideal. Max 8 ft/sec before noise & erosion risk. Drain lines: 2–10 ft/sec. Aim for under 4 psi per 100ft on supply lines. Higher pressure drop = undersized pipe or too long a run. Toilet: 2 GPM · Shower: 2.5 GPM · Kitchen sink: 2.2 GPM · Dishwasher: 1.5 GPM · Hose bib: 5 GPM · Washing machine: 5 GPM PVC — Cold water, irrigation. CPVC — Hot + cold supply. Copper (L) — Most reliable, premium. PEX — Flexible, freeze-resistant. Galvanized — Legacy only. Quick answer: For most residential water supply and water service lines, use ¾" (20mm) pipe for…from pipesizecalculator.com
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