🌧️

Rainwater Harvest Calculator

Result
—gallons/year
Per Inch of Rain
—
Tank Size
—
CalcBuild › Rainwater Harvest Calculator

How to Calculate Rainwater Harvest

Use this free rainwater harvest calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

Related Calculators

▸ 2x4▸ 3 4 5 Rule▸ Ac Size▸ Ac Tonnage▸ Acreage▸ Ada Ramp

💡 Pro Tips — Rainwater Harvest

❓ Frequently Asked Questions

+What pipe material is best?
PEX: best for new residential — flexible, cheap, freeze-resistant. Copper: proven but expensive. PVC: drain/vent only.
+What size pipe for a bathroom?
1/2" supply lines for fixtures, 3/4" main line, 2" drain for shower, 3" or 4" for toilet.
+Do I need a permit?
Yes for new plumbing lines or moving existing ones. Fixture replacements (e.g., new faucet) usually do not require permits.
+What is a fixture unit?
A measurement for sizing supply and drain pipes. Toilet: 4 FU. Lavatory: 1 FU. Shower: 2 FU. Kitchen sink: 2 FU.
+cost.toFixed(0):'—')+''; b.appendChild(r);}); var tr=document.createElement('tr');tr.innerHTML='ESTIMATED TOTAL
🌧️

Rainwater Harvest Calculator

Result
—gallons/year
Per Inch of Rain
—
Tank Size
—
CalcBuild › Rainwater Harvest Calculator

How to Calculate Rainwater Harvest

Use this free rainwater harvest calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

Related Calculators

▸ 2x4▸ 3 4 5 Rule▸ Ac Size▸ Ac Tonnage▸ Acreage▸ Ada Ramp
+t.toFixed(0)+''; b.appendChild(tr);c.style.display='block';}
🌧️

Rainwater Harvest Calculator

Result
—gallons/year
Per Inch of Rain
—
Tank Size
—
CalcBuild › Rainwater Harvest Calculator

How to Calculate Rainwater Harvest

Use this free rainwater harvest calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

Related Calculators

▸ 2x4▸ 3 4 5 Rule▸ Ac Size▸ Ac Tonnage▸ Acreage▸ Ada Ramp