Your planted tank,
remembered.
Every calculation, reading, favourite and reminder you make on AquaCalc — saved to your account and waiting for you on any device.
Check your inbox. A one-time link is on its way to your email — it expires in 15 minutes.
No password to create or forget. Your first sign-in makes your account. UK GDPR compliant.
- Free forever
- No password
- No ads or tracking
- Delete anytime
A free account that pulls its weight
You never need an account to use AquaCalc — the tools are all free and open. But sign in once and the whole site starts working for you, remembering your tank instead of making you start over every visit.
Your tank remembers your numbers
Every calculator and your full parameter log save to your account and sync across phone, tablet and desktop. No more re-typing tank dimensions or losing last week’s readings.
Save & pin your favourites
Bookmark any guide or plant profile, pin the ones you reach for most to the top, and get a badge for anything new since your last visit. Your own quick-reference shelf.
Never miss maintenance again
A visual schedule for water changes, filter cleans, dosing and testing — built around your tank, with a calendar you can actually see at a glance.
Heat-wave early warning
Switch on local heat alerts and we’ll warn you before a hot spell pushes your tank into the danger zone — based on the real forecast for your postcode.
Your comments, recognised
Ask questions and join the discussion under any guide or plant profile, recognised as you across every device — no re-entering your name each time.
Private by design
No ads. No third-party trackers. We never sell your data. Unsubscribe from any email in one click and erase your whole account whenever you like — UK GDPR compliant.
Passwordless, because passwords are the worst
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1
Enter your email
One field, above. No password to invent, no form to fill in.
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2
Click the link we send
A one-time sign-in link lands in your inbox within seconds. It’s valid for 15 minutes.
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3
You’re in — for good
Your account is created and stays signed in. Next time, the same link gets you straight back.
Ready when you are
It’s free, it takes ten seconds, and there’s nothing to lose — you can delete your account and everything in it with one click, any time.
Check your inbox. A one-time link is on its way to your email — it expires in 15 minutes.
By creating an account you agree to our Privacy Policy. No spam, ever.