Free Aquarium Tools

A set of free calculators and planners for UK fishkeepers. No signup, no ads, no data sent anywhere — everything runs in your browser.

Planning

Convert length × width × height into real litres

Is your tank overstocked? Check bioload in seconds

Will a species thrive in your tap water?

Will these two species get along?

Log your daily readings until the cycle completes

Step-by-step drip acclimation with a live timer

Water change, feeding, and test reminders