Source: sarvesh
~90% of UP vocabulary comes from Sanskrit-Prakrit:
- tatsama 25%
- tadbhava 50%
- deshaja 15%
The rest 10% are loan words, most of which modified to indigenize.
The number 90% is the estimate of a scholar who studied UP’s speech.
As per Urdu lexicographers like Rauf Parekh and Syed Ahmed Dehlavi, 99% of Urdu verbs and 75% of Urdu words come from Sanskrit and Prakrit.