Food Engineering Basic Tools

I am making a Food Engineering app that combines the basic tools for a Food Engineer.
I am adding a:
Temperature Convertor (°C<>°F<>°K),
a D and Z value graph plotter,
a Moisture content convertor(dry basis<>wet basis)
a Material and Energy balance calculator

I'd very much appreciate any more tools I can implement into the app.
Thanks in advance.😃😃