Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Climate
Rainwater Harvesting Calculator
Estimate how many gallons of rainwater your roof can collect each year and how much you could save on your water bill. Ideal for homeowners planning a rain barrel or cistern system.
Fill in the required fields to see your result.
Climate
Green Roof Benefits Calculator
Estimate annual energy savings, stormwater retention, and combined financial benefits of installing a green roof. Use it when comparing green roof types or justifying the investment to building owners and planners.
Fill in the required fields to see your result.
Key differences
| Rainwater Harvesting Calculator | Green Roof Benefits Calculator | |
|---|---|---|
| Category | Climate | Climate |
| Inputs required | 4 | 5 |
| Result | Annual Water Cost Savings ($) | Annual Environmental Value ($) |
| What it does | Estimate how many gallons of rainwater your roof can collect each year and how much you could save on your water bill. Ideal for homeowners planning a rain barrel or cistern system. | Estimate annual energy savings, stormwater retention, and combined financial benefits of installing a green roof. Use it when comparing green roof types or justifying the investment to building owners and planners. |