47 free tools · 7 focused sections
Water & Mechanical calculators
Plan water storage, volume, flow, pressure, heating, irrigation runtime and wastewater capacity with transparent formulas.
10 calculators
Plumbing, pipes & flow
Pipe size, volume, weight, velocity, flow, pressure loss, fixtures and leaks.
2 calculators
Septic & wastewater
Septic tanks, drain fields and wastewater planning.
12 calculators
Pumps, wells & storage
Pumps, wells, tanks, cisterns, pressure tanks and water softeners.
4 calculators
Water heating
Water-heater size, recovery, energy cost and related heating estimates.
7 calculators
Pools & hot tubs
Pool and hot-tub volume, fill cost, heating, evaporation, pumps and water weight.
9 calculators
Rainwater & irrigation
Rain harvesting, rain barrels, irrigation, garden watering and lawn cost.
3 calculators
Water demand & cost
Household demand, usage cost, fill time and other water-planning tools.
About these calculators
Rainwater tank overflow, irrigation dripline length, sump-pump running cost, pool heating cost, well-pump running cost, water-heater energy cost, pool heating time, pool fill cost, rainwater payback, irrigation cost, plumbing flow, hot-tub heating, pipe insulation, water usage, pressure tanks, softeners, cisterns, septic, pumps, wells and storage calculators. Each tool provides a task-specific estimate, explains its assumptions, and rounds purchasing quantities where appropriate. Supplier specifications and local requirements remain the final authority.