Sure thing, mate! Here's an example:

Decimal format private key (just a big number):

27591273457912837912739412379741273957129347129

Converted to Hexadecimal:

3B9AC9C7A1BEA317E1E96994CF45F5DF

Remember though, this is just a random example - don't use it for real transactions! And always remember to keep your actual private keys safe and secure.