Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Water Usage
Rainwater Harvesting Calculator
Estimate how many gallons of rainwater you can collect annually from your roof, capped by your tank size. Use it when designing a rain barrel system or planning irrigation needs.
Fill in the required fields to see your result.
Water Usage
Household Water Bill Estimator
Estimate your monthly residential water bill from household size, an assumed per-person usage level, and the local volumetric water rate. A quick budgeting tool, not a substitute for reading your utility statement.
Fill in the required fields to see your result.
Key differences
| Rainwater Harvesting Calculator | Household Water Bill Estimator | |
|---|---|---|
| Category | Water Usage | Water Usage |
| Inputs required | 4 | 3 |
| Result | Annual Harvestable Water (gallons) | Monthly Water Bill ($) |
| What it does | Estimate how many gallons of rainwater you can collect annually from your roof, capped by your tank size. Use it when designing a rain barrel system or planning irrigation needs. | Estimate your monthly residential water bill from household size, an assumed per-person usage level, and the local volumetric water rate. A quick budgeting tool, not a substitute for reading your utility statement. |