UD5 Toolkit
Aquarium Volume Calculator - Online Rectangular & Bow Front Tank
Calculate water volume for rectangular, bow-front, and cylindrical tanks. Also computes weight of water. Supports inches/cm. Useful for dosing treatments.
Tag: Aquarium Water Chemistry & Stocking
9+ toolsAquarium Heater Size Calculator - Online Wattage Recommendation
Find the right heater wattage for your fish tank based on volume and desired temperature rise. Simple rule-of-thumb calculator. Local only.
Aquarium Bioload Calculator – Online Stocking Level Indicator
Add fish species and sizes to estimate the bioload and check if your tank is overstocked. Inch‑per‑gallon model.
Aquarium Fishless Cycle Ammonia Calculator – Online Dose
Calculate how much pure ammonia to add to reach 4ppm for a fishless cycle. Safe start guide.
Planted Aquarium CO2 Estimator – Online pH, KH, and CO2 PPM
Use the pH and KH relationship to estimate dissolved CO2 concentration in your planted tank. Reach 30ppm safely for lush plant growth.
Aquarium Additive Doser – Online ml per Gallon Calculator
Enter tank volume and recommended dose to find exact ml or capfuls needed. Avoid overdosing fish.
Fish Quarantine Countdown – Online New Arrival Observation
Set a date when a new fish arrives and get a daily checklist for observation. Countdown to safe introduction.
Aquarium Water Change Calculator - Online Safe Volume Replacement
Calculate how much water to change weekly to keep nitrates under control. Based on current nitrate level, desired level, and tank volume.
Aquarium pH/GH/KH Adjustment Calculator – Online Dosing Tool
Calculate how much acid, alkaline buffer, or remineralizer to add to reach target water parameters.