# Free tools

Free tools for liquid cooling for AI and high-density data centers. You need no account.

- [Rack heat load and coolant flow calculator](https://liquidcooling.fyi/tools/rack-heat-coolant-flow.md): Calculate required coolant flow rate from rack heat load, temperature rise and fluid properties. Cite the formula.
- [Cooling method picker by rack kW](https://liquidcooling.fyi/tools/cooling-method-picker.md): Pick a cooling approach by your rack density (kW per rack) using published thresholds.