Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Water Heater Size Calculator
Estimates the recommended water heater tank capacity in gallons based on household size and hot water usage habits. Use it when purchasing a new water heater or upgrading to match a growing household's demand.
Fill in the required fields to see your result.
Plumbing
Septic Tank Size Calculator
Estimates the minimum septic tank capacity needed for a household based on bedroom count and daily water usage. Use it when planning a new septic installation or verifying compliance with local health codes.
Fill in the required fields to see your result.
Key differences
| Water Heater Size Calculator | Septic Tank Size Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 2 | 2 |
| Result | Recommended Capacity (gallons) | Required Tank Size (gallons) |
| What it does | Estimates the recommended water heater tank capacity in gallons based on household size and hot water usage habits. Use it when purchasing a new water heater or upgrading to match a growing household's demand. | Estimates the minimum septic tank capacity needed for a household based on bedroom count and daily water usage. Use it when planning a new septic installation or verifying compliance with local health codes. |