Aquarium Calculators

About this app

You are the kind of aquarium keeper who notices the small details: a nitrate shift, a missed filter cleaning, a new fish settling in, or a dose that needs to be checked twice. Aquarium Planner & Water Math is built for that careful style of fishkeeping, giving you one local-first place to track tanks, log care, and run the numbers before you act.

View on the App Store

Use it when you need a quick answer at the tank: how many gallons a setup holds, how much water a change requires, what a dose should be, how recent test results are trending, or which maintenance task is due next. It supports freshwater, planted, saltwater, reef, quarantine, hospital, breeding, and pond workflows without forcing you into a complicated account system.

Plan and Track Your Aquariums
– Create aquarium records for active tanks.
– Track water type, volume, units, setup details, and notes.
– Review dashboard cards for current tank status and due work.
– Keep fish, plant, equipment, and treatment details organized by tank.
– Preserve readable history even when Pro access changes.

Log Water Tests and Maintenance
– Record ammonia, nitrite, nitrate, pH, KH, GH, temperature, and salinity.
– Log filter cleaning, gravel vacuuming, carbon changes, light replacement, dosing, and other maintenance.
– Track water change plans and completed changes.
– Review timelines, summaries, sparse data notes, and outlier warnings.
– Use free-tier caps for core records, with Aquarium Pro available for expanded tracking.

Aquarium Calculators
– Tank size and volume calculators for rectangular, hexagon, cylinder, half-cylinder, and quarter-cylinder tanks.
– Surface area and water weight estimates.
– Setup planning for substrate and water weight.
– Water change calculator for nitrate target planning.
– Chemical dosing calculator for common aquarium workflows.
– Stocking helper for quick fish-per-gallon estimates.

Unit Converters
– Pressure: psi, kPa, bar, and atm.
– Temperature: Celsius, Fahrenheit, and Kelvin.
– Volume: US gallons, Imperial gallons, liters, cubic inches, and cubic centimeters.
– Flow rate: US gph, US gpm, L/h, and L/min.

References and Fish Care
– Fish care profiles for quick lookup.
– Water parameter ranges for freshwater, planted, saltwater, and reef systems.
– Nitrogen cycle notes.
– Water change guidance.
– Acclimation basics.
– Compatibility and emergency troubleshooting reminders.

Local-First Data
Aquarium Planner & Water Math stores aquarium records locally on your device. Aquarium Pro includes local JSON backup export and restore tools for moving simplified Aquarium records between installs or devices. Backup files include aquariums, water tests, maintenance events, fish, plants, equipment, treatments, water change plans, and achievements. Photos, expense records, and CSV payloads are not part of the current backup package.

Aquarium Pro
Aquarium Pro unlocks expanded limits and advanced tools. The app supports a monthly auto-renewing subscription and a lifetime one-time purchase. Restore Purchases is available for users who reinstall or move to a new device. Existing records remain readable if Pro access changes.

Built for Repeat Care
Aquarium care depends on small, repeated actions: testing water, planning changes, checking equipment, dosing carefully, and reviewing what changed since last week. This app keeps those numbers and records in one practical workspace so maintenance decisions start from better context.

Aquarium Planner & Water Math does not replace species research, quarantine protocol, product instructions, or veterinary guidance. It provides calculations, logs, and reference material to support more consistent aquarium care. Use it tank-side.

For monthly subscriptions:
Monthly Pro is a 1-month auto-renewable subscription.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

App Store Screenshots

Latest App Store Release Notes

Thank you for using Aquarium Planner. You already do the hard part: you show up for your aquarium again and again, checking water, feeding carefully, noticing behavior, and keeping the system stable. This update is built for that steady attention, expanding Aquarium Planner & Water Math from a calculator-focused tool into a fuller care workspace for repeat tank maintenance.

New Aquarium Tracking
– Added live tank records with dashboard cards and tank detail views.
– Added support for tank type, water type, volume, units, notes, and status summaries.
– Added logbook workflows for water tests, maintenance, and water changes.
– Added livestock, plant, equipment, and treatment tracking.
– Added readable history behavior for records that should remain visible when Pro access changes.

Better Water Testing
– Added water test records for ammonia, nitrite, nitrate, pH, KH, GH, temperature, and salinity.
– Improved summaries for recent readings and abnormal values.
– Added sparse data notes so one or two readings are not presented like a full trend.
– Added outlier handling and clearer result language.
– Improved same-day ordering for backfilled logs.

Maintenance and Water Changes
– Added maintenance event logging for filter cleaning, gravel vacuuming, carbon replacement, lighting, dosing, and other routine work.
– Added water change plans and completion tracking.
– Improved next-due handling and validation around maintenance dates.
– Added clearer warnings for impossible or future-dated records.
– Improved free-tier record cap messaging.

Calculators and Converters
– Kept core aquarium calculators: tank volume, surface area, water weight, setup planning, water change planning, chemical dosing, and stocking help.
– Improved result readability for longer labels and values.
– Improved reset, share, and saved-input behavior across calculator screens.
– Improved pressure, temperature, volume, and flow converter consistency.
– Refined edge cases for nitrate targets, zero values, invalid input, and partial entries.

References and Fish Care
– Added fish care lookup surfaces.
– Added water parameter ranges for freshwater, planted, saltwater, and reef tanks.
– Added nitrogen cycle notes, water change guidance, acclimation basics, compatibility reminders, and emergency troubleshooting advice.

Layout and Accessibility
– Improved Settings so content scrolls instead of crowding on compact screens.
– Improved key/value rows so long labels and values align or stack more predictably.
– Reduced unnecessary truncation in list and card text.
– Centralized decorative backgrounds so screens scale better on iPhone, iPad, landscape, and split view.

Quality Fixes
– Fixed DateTools collection end-date recomputation.
– Removed reachable placeholder and coming-soon surfaces from production routes.
– Cleaned stale expense references from active metadata and old sprint notes.
– Improved backup restore handling for future warranty dates.

Thanks for taking aquarium care seriously enough to track the details. This release is designed to make those details easier to record, review, and act on without turning maintenance into busywork.

App Store Information

• App Store category: Utilities
• Genres: Utilities, Reference
• Availability: Free
• Current version: 9.6
• Requires: iOS 17.6 or later
• Content rating: 4+
• Last updated: 2026-09-11

Developed by Verosocial. App details can change; verify the current App Store listing before publication.