Plumbing calculators

Enter your loop, pump, utility, and wait-time details to estimate the annual cost of keeping water ready. The result separates pipe heat loss, pump electricity, and the value of water and sewer charges avoided at the tap.

Enter the controlling loop length, copper tube size, insulation, temperatures, and allowance for fittings. The calculator estimates heat loss, required GPM, friction head, total head, and the pump duty point to compare with circulator curves.

Enter the tank size, usable drawdown, water temperatures, shower flow, and recovery rate. The calculator estimates continuous shower time, back-to-back shower capacity, and the tank or recovery rate needed for a planned run.

Enter the stack diameter, connected DFU load, and developed vent length to find the smallest stack vent or vent stack size allowed by IPC Table 906.1.

Enter the roof area, rainfall rate, drain count, tested drain capacity, and pipe slope to size a preliminary IPC storm-drain path. The result separates primary drain demand from the independent secondary drainage check.

Enter the basin geometry, pump-down level separation, pump flow, and design inflow to check whether the basin gives enough active volume. The result shows the exact worst-case starts per hour and the float spacing needed for the entered limits.

Enter the fixtures served by one hot or cold branch to total the fixture units, choose the PDI size letter, adjust for pressure above 65 psi, and see how many 20-foot placement sections the branch needs.

Enter the tank, temperature, and nameplate details to estimate how long a water heater takes to recover and how much mixed shower water it can support.

Use your untreated-water hardness and the documented settings for your particular softener to estimate its regeneration interval, salt use, and regeneration water. The calculation uses working capacity at the salt dose you actually run, rather than an advertised maximum grain rating.

Enter the pump flow, pressure switch settings, and tank precharge to estimate the minimum nominal tank volume. You can also enter an existing tank size to see its drawdown, runtime, and fastest theoretical cycling rate.