Pond calculators.
Then the real volume.
Free calculators for volume, liners, pumps, salt and water care. Type your measurements in for a quick estimate, or trace your pond for the precise volume.
PondTools measures the pond itself.
Trace the pond on a photo or satellite image, set the shelves and floor, and see it in 3D. The volume comes from the real shape, and every calculator here can use it.
Design a pond
A box formula is a guess.
A traced pond is a measurement.
Every calculator here starts from volume. Length times width times depth assumes straight walls and a flat floor, and real ponds have neither. Trace the outline on a photo or satellite image, set the shelves and floor, and PondTools works out the gallons from the actual shape.
Dosing, liner size and pump flow then follow the pond you have.
Every calculator
Measurement & building
Water care
Equipment
- Surface area toolsEstimate aeration, de-icer requirements and stocking limits from surface area.
- Stocking calculatorCompare fish stocking against pond volume, surface area and expected adult size.
- Pump turnover & head lossCalculate target flow and total dynamic head from turnover, lift and pipework.
Pond management
- Fish conditionScore a bass, bluegill, crappie, perch, catfish or walleye against the standard weight for its length.
- New pond stocking planWork out how many bluegill, redear, bass, catfish and minnows to stock per acre, and in what order.
- LimingEstimate the agricultural limestone needed to raise total alkalinity, from a water test and the bottom soil type.
- Muddy water treatmentCalculate the alum or gypsum that settles suspended clay, and the hydrated lime buffer alum needs in soft water.
- FeedingCalculate the daily pellet ration from fish weight and water temperature, with the protein level each species wants.
- Carrying capacityEstimate how many pounds of fish an acre supports at each fertility level, and how much of that can be predators.
- Pond aeration sizingSize bottom diffusion for a pond over eight feet deep, with the staged start-up that avoids a turnover kill.
- FertilizationCalculate fertilizer per application, decide when to apply from a Secchi reading, and check the cases where fertilizing is a mistake.
- Harvest plannerPlan the yearly harvest that keeps a bass and bluegill pond balanced, or pushes it toward trophy bass or trophy bluegill.
- Stock density (PSD)Calculate proportional stock density from the lengths of fish you caught or seined, and read what the bass and bluegill numbers say together.