single phase supply for a three phase ind motor

Use Inverter/ cycloconverter.

Assuming you want to know how to size a single phase supply to feed a phase converter that runs a 3 phase motors, the single phase current will be greater than the 3 phase current by a factor of 1.732 (sq. rt. of 3), plus any losses in the phase converter. Generally, static phase converters are only about 40% efficient when you account for the loss in power of the 3 phase motor due to unbalanced power, rotary are about 70% eff for the same reason. Digital phase converters such as VFDs are about 95% efficient as a group, some claim higher numbers.

If you are thinking you can run a 3 phase motor from a single phase supply without adding a phase, you are mistaken.