53 free tools · 7 focused sections
Water & Mechanical calculators
Plan water storage, volume, flow, pressure, heating, irrigation runtime and wastewater capacity with transparent formulas.
Selection guidance
Choose the right water & mechanical calculator
Define flow, volume and pressure
These are different quantities; select a calculator that addresses the actual system question.
Use the operating point
Pump and equipment ratings must be checked at real head, pressure, temperature and efficiency conditions.
Plan for losses and controls
Fittings, standby loss, cycling, storage and safety controls can materially change real performance.
13 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.
14 calculators
Pumps, wells & storage
Pumps, wells, tanks, cisterns, pressure tanks and water softeners.
5 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-water recirculation heat loss, 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.
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