Free tools
Reef Aquarium Tools & Calculators
Twelve free tools for planning and running a saltwater aquarium. They run in your browser, need no account, and anything you save stays on your own device.
Plan
Decide what to build and what it will cost.
- Reef Tank Match Quiz Answer nine questions and get a tank style that fits your space, budget and goals.
- Aquarium Size Calculator Work out a sensible tank size and what it needs for filtration, light and flow.
- Reef Equipment Planner Build an equipment list for your tank size and budget tier.
- Reef Budget Calculator Estimate start-up cost, monthly running cost and power use.
Design
Lay out rock, flow and light before anything gets wet.
Stock
Choose animals that suit the tank and each other.
Maintain
Keep records so small problems are caught early.
Not sure where to begin?
The guided build path walks through the tools in order, and the beginner path pairs them with the articles that explain each step.
Tool results are estimates to help you plan. Always check equipment sizing against the manufacturer’s guidance for your exact tank.