Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Plumbing
Fixture Unit Demand Calculator
Computes the total plumbing demand load in fixture units for toilets, sinks, showers, and appliances, then converts it to a peak flow estimate for pipe sizing. Use it when designing or auditing a building's water supply system.
Fill in the required fields to see your result.
Plumbing
Toilet Flush Volume Calculator
Computes the volume of water used per flush by measuring the internal dimensions of the toilet tank. Ideal for identifying water-wasting fixtures, calculating household water consumption, or qualifying for rebate programs.
Fill in the required fields to see your result.
Key differences
| Fixture Unit Demand Calculator | Toilet Flush Volume Calculator | |
|---|---|---|
| Category | Plumbing | Plumbing |
| Inputs required | 5 | 3 |
| Result | Peak Demand (GPM) | Flush Volume (gallons) |
| What it does | Computes the total plumbing demand load in fixture units for toilets, sinks, showers, and appliances, then converts it to a peak flow estimate for pipe sizing. Use it when designing or auditing a building's water supply system. | Computes the volume of water used per flush by measuring the internal dimensions of the toilet tank. Ideal for identifying water-wasting fixtures, calculating household water consumption, or qualifying for rebate programs. |