KPE Tool Box
Your pond is a system. These tools help you understand how the pieces fit together, whether you are designing a new pond, checking an existing system, or trying to understand a problem.
Calculate it. Understand it. Plan it better.
KPE does not just give you a number.
A calculation can affect other parts of your pond. Flow affects pipework. Pipework affects resistance. Resistance affects total dynamic head. Total dynamic head affects the pump’s actual operating point.
Each tool helps you understand the result and points you towards the next useful engineering question.
Pond & Water
Start with the water itself. Volume affects almost everything that follows.
Pond Volume Calculator
Calculate pond volume from your dimensions and see what that volume means for circulation.
AvailableWater Change Calculator
Calculate how much water is required for a planned percentage water change.
AvailablePond Water Capacity Calculator
Calculate water capacity for filling, topping up and planning.
PlannedPond Level & Water Loss Calculator
Estimate water loss and help identify when normal evaporation may not explain the change.
PlannedFlow & Hydraulics
Understand how water moves through the system and where resistance comes from.
KPE Flow Rate Calculator
Calculate and convert flow in L/h, L/min, m³/h, Imperial GPH and US GPH.
AvailablePipe Size Calculator
Explore appropriate pipe sizes for your required pond flow.
PlannedPipe Flow & Velocity Calculator
Calculate flow velocity through a pipe and understand what it means for your system.
PlannedFriction Loss Calculator
Estimate head loss caused by water flowing through pipework.
PlannedFitting Loss Calculator
Account for resistance from bends, valves, tees and other fittings.
PlannedTotal Dynamic Head Calculator
Combine static head and system resistance to determine the total head your pump must overcome.
PlannedPump Operating Point Calculator
Understand where pump performance and system resistance meet to determine actual operating conditions.
PlannedThe KPE Engineering Chain
The tools are connected because the decisions are connected.
Pond Volume → Turnover → Flow → Pipework → Friction Loss → TDH → Pump → Filtration → Energy
Pump Selection & Energy
The pump must work with the system, not simply match a number on its label.
Pump Size Calculator
Determine the pump performance required for your system.
PlannedPump Energy Calculator
Estimate the electrical energy used by a pond pump.
PlannedPump Running Cost Calculator
Estimate the ongoing electricity cost of running your pump.
PlannedPump Comparison Tool
Compare pump performance, energy use and operating requirements.
PlannedFiltration
Filtration capacity, flow and biological loading need to work together.
Filter Size Calculator
Estimate filtration requirements from pond volume, flow and biological load.
PlannedFilter Flow Calculator
Check the relationship between filter capacity and water flow.
PlannedFilter Loading Calculator
Estimate loading on filtration based on pond conditions and stocking.
PlannedFilter Pressure & Resistance Check
Understand how filtration equipment can contribute to system resistance.
PlannedBottom Drains & Gravity Systems
Gravity-fed systems depend heavily on pipe size, elevation and available flow.
Bottom Drain Flow Calculator
Estimate flow requirements through bottom drain systems.
PlannedBottom Drain Pipe Size Calculator
Explore pipe sizing for bottom drain installations.
PlannedGravity Flow Calculator
Estimate gravity-fed flow through pond and filtration systems.
PlannedBottom Drain Spacing & Coverage
Explore bottom drain placement and pond coverage.
PlannedGravity vs Pump-Fed Comparison
Compare the engineering characteristics of gravity-fed and pump-fed systems.
PlannedHeating & Energy
Understand heat demand, heat loss and the cost of maintaining temperature.
Pond Heating Calculator
Estimate heating requirements for maintaining pond temperature.
PlannedHeater Size Calculator
Estimate heater capacity for your pond and target temperature.
PlannedHeat Loss Calculator
Estimate heat loss from the pond environment.
PlannedHeating Running Cost Calculator
Estimate the cost of maintaining pond temperature.
PlannedPond Energy Calculator
Estimate the combined energy requirements of major pond equipment.
PlannedAeration & Oxygen
Airflow, depth, resistance and biological demand all influence aeration.
Aeration Calculator
Estimate aeration requirements for your pond.
PlannedAir Pump Size Calculator
Estimate air pump requirements for pond aeration.
PlannedAir Line Resistance Calculator
Understand how air line length and resistance affect airflow.
PlannedDiffuser & Air Stone Calculator
Explore diffuser and air stone requirements.
PlannedOxygen Requirement Estimator
Estimate oxygen requirements based on pond conditions and biological load.
PlannedPond Planning
Turn the basic idea into dimensions, materials and construction requirements.
Pond Design Calculator
Bring key pond design variables together before construction.
PlannedPond Dimension Planner
Explore pond dimensions and their effect on volume and design.
PlannedPond Excavation Calculator
Estimate excavation volume for pond construction.
PlannedConcrete Volume Calculator
Calculate approximate concrete quantities for pond construction.
PlannedConcrete & Rebar Estimator
Estimate basic material quantities for planning purposes.
PlannedPond Liner Size Calculator
Calculate liner dimensions from pond dimensions and depth.
PlannedUnderlay Calculator
Estimate underlay requirements for pond liners.
PlannedPond Wall Structural Planning
Explore structural considerations while recognising where professional engineering is required.
PlannedStocking & Biological Load
Fish numbers, fish size and feeding load can change the demands placed on the system.
Koi Stocking Calculator
Explore stocking levels in relation to pond volume and filtration.
PlannedBiomass Calculator
Estimate total fish biomass in the pond.
PlannedFeeding Load Calculator
Estimate biological loading associated with feeding.
PlannedFuture Stocking Calculator
Explore how future fish growth and stocking plans may affect the system.
PlannedMaintenance
Keep the system operating as designed and understand the ongoing cost of ownership.
Water Change Planner
Plan routine water changes around pond volume and frequency.
PlannedFilter Cleaning Interval Estimator
Estimate appropriate cleaning intervals from system conditions.
PlannedUV Replacement Planner
Keep track of UV equipment replacement requirements.
PlannedPump Maintenance Planner
Plan routine inspection and maintenance of pond pumps.
PlannedPond Maintenance Cost Calculator
Estimate recurring maintenance costs for a pond system.
PlannedKPE Quick Check
Sometimes the right starting point is the problem, not the calculation.
Pond problem? Start here.
Work through common symptoms such as poor flow, pump problems, water loss, filtration problems, aeration problems and power-related issues.
Open KPE Quick Check →One calculation can change the next calculation.
If you change an important design decision, stop and reconsider the parts of the system that depend on it. A different flow rate, pipe size, pump, filter or pond volume may change what comes next.
KPE helps you follow those connections rather than treating every calculation as an isolated number.