You'll have to give more information on your level in calculus and what areas. I did calculus a long time ago and I wouldn't be of any use to you.
I hope you do find someone. Try your colleagues, your teachers, books, Internet etc etc etc. However, for someone to do it for free is a big ask.
Maybe you could try a language/maths exchange. You find somebody who has a good level in English who can teach you calculus in exchange for English.