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Hello @fibbu
There is an easier solution. You can install the “Converter for Calculated Fields Form” complementary plugin (https://cff-bundles.dwbooster.com/product/converter).
It makes the process easier for you. You would need only to insert two calculated fields (fieldname1, fieldname2), configured as writable (by unticking the read-only checkbox in their settings), and two dropdown fields (fieldname3, fieldname4) with the measurement units.
And finally, the equations would be very straightforward.
The equation of fieldname1:
CFFCONVERTER(fieldname2, fieldname4, fieldname3)And the fieldname2 equation:
CFFCONVERTER(fieldname1, fieldname3, fieldname4)Best regards.