Free aquarium calculators and tools

Quick answers for planning and running a tank. The stocking checker uses the same care data as the AquaLog care guide; the guides explain the reasoning behind the numbers.

• Aquarium stocking calculator and tank-mate checkerPick your tank size and fish to check minimum tank sizes, group sizes, shared temperature and pH ranges, and fish their care guides say to avoid.
• Aquarium volume calculatorWork out how many litres or gallons your aquarium holds, for rectangular and cylinder tanks, plus the likely real water volume and weight.
• Aquarium water change calculatorFind how much water to change to bring nitrate (or any reading) down to a target, and how many smaller changes would do the same job.
• Aquarium electricity cost calculatorEstimate what your aquarium's heater, filter and light cost to run each month and year, using your own electricity tariff in ₹ per unit.