Freshwater Aquarium Calculators
Enter your numbers, get an instant answer. No accounts, no ads in the way, no waiting.
🧊 Aquarium Volume Calculator
Find the real water volume of your tank in gallons and litres — the figure every dosing, stocking and heater decision depends on.
💡 Measure to your actual water line, not the tank rim. Subtract ~10–15% for substrate and hardscape to get true displaced volume.
🐠 Fish Stocking Calculator
A safer starting estimate than "1 inch per gallon", weighted for adult fish size and body bulk.
💡 Always research each species' social, territorial and water-parameter needs before adding fish.
🦐 Shrimp Feeding Calculator
Work out how much to feed your colony so food disappears within hours, not days.
💡 Remove uneaten food after 3–4 hours. Overfeeding is the leading cause of ammonia spikes in shrimp tanks.
Tools we built because they didn't exist
Most aquarium sites repeat the same volume and stocking tools. These fill real gaps we kept hitting while breeding snails and shrimp.
Snail Clutch & Hatch-Window Tracker
Log a clutch date and get an estimated hatch window by species (mystery, nerite, ramshorn, rabbit snail) based on typical incubation temperature ranges.
Try Now Rare toolShrimp Molt Cycle Estimator
Estimate your shrimp's next molt window from species and water temperature, so you know when to expect a hiding shrimp instead of worrying it's sick.
Try NowComing Soon to FishioHub Tools
Built one at a time and tested against our own tanks before publishing. New tools go live monthly.
CO₂ & Bubble Count Calculator
Target bubbles-per-second for your planted tank size, lighting level and CO₂ system.
Water Hardness (GH/KH) Converter
Convert between dGH, ppm and mmol/L, and check suitability for shrimp, snails or soft-water fish.
Heater Wattage Calculator
Right-size a heater to your tank volume and the gap between room and target water temperature.
Water Change & Parameter Log
A printable log for tracking ammonia, nitrite, nitrate, pH and GH over time, by tank.
Aquarium Substrate Calculator
Estimate kg of sand, gravel or aqua soil needed for your tank footprint and desired depth.
Quarantine Timeline Planner
Day-by-day quarantine schedule for new fish, shrimp or snails before entering your main tank.
Other Tools from FishioHub's Earlier Years
Before 2025, FishioHub covered broader topics including fishing gear, fish farming and angling. That content remains available below. Since 2025, FishioHub has been exclusively focused on freshwater aquariums.
Fish Weight Calculator
Estimate fish weight from length and girth for bass, trout, catfish and more.
View ToolFish Farming Calculator
Estimate how many fish you can stock in a pond or farm tank.
View ToolBiofloc Cost & Profit Calculator
Estimate setup cost, operating cost and ROI for a biofloc farming unit.
View ToolBass Fish Comparison Tool
Compare Sea Bass, Striped Bass, Black Bass and Hybrid Striper species.
View ToolFish Nutrition Facts (100g)
Calories, protein, fat and omega-3 data for over 100 fish species.
View ToolFishing Fine Calculator
Estimated US state-by-state fines for fishing without a license.
View ToolFishing Quiz: Test Your IQ
An interactive trivia quiz for anglers of all levels.
View Tool