AquaPulse Tools
Nine free calculators run right here on the website, no login required — for water changes, tank size, heater wattage, filter turnover, reef dosing, medication dosing, RO/DI water mixing, planted aquarium fertilising and saltwater mixing. Water Check and deeper ongoing tracking are available in the AquaPulse app.
Plan ahead
A guided assistant that works out how much water to remove and prepare for your next water change, and estimates the likely effect on your readings.
Work out your tank's water volume in litres, US and UK gallons, and its approximate water weight — plus honest guidance on what actually determines safe stocking.
Get a sensible heater wattage range from your tank's volume, target temperature and room — plus honest guidance on choosing and sizing a heater safely.
Work out your filter's turnover rate from your tank's volume and flow rate, with an optional real-world adjustment and honest guidance on what turnover does and doesn't tell you.
Work out how much alkalinity, calcium or magnesium supplement to dose, scaled from your product's own stated strength to your tank's volume.
Scale your medication's own label dose to your actual tank volume. Arithmetic only — it doesn't recommend a product, diagnose a condition, or choose a treatment for you.
Work out how much RO/DI and tap water to blend, by volume, to reach a target GH or KH — based on your own tested readings.
Scale your fertiliser's own label dose to your actual tank volume and a weekly schedule. Arithmetic only — it doesn't recommend a product or nutrient target.
Work out how much salt mix to add for a target batch size, scaled from your salt product's own stated recipe. It doesn't target a different salinity or assume your source water's starting salinity.
Diagnose or track
Record your aquarium readings in the AquaPulse app and get a clear explanation of what those results may mean.
A guided tool for common aquarium emergencies — gasping fish, sudden losses, cloudy water and more. See likely causes, sensible next steps, and when to get specialist help.
More free web tools are on the way alongside these. In the meantime, the AquaPulse app offers ongoing help with your aquarium.