Reporting business mileage for vehicles also used for personal use

I am filing a schedule c for a small business. I have two personal vehicles that I used for some driving for the business. Is there an easy way to just report the miles I drove for business? It is asking for all mileage used for personal use, etc. but I only tracked business miles when using these vehicles for that purpose. I did not track my mileage when driving the vehicles for personal use. Thanks