Thanks for your reply. Appreciated. However, it does seem like the tool is doing all the work for me. I'm trying to learn how the calculation works myself.
I did understand that you need to multiple the decimal representation of my private key with base point G, however, I did not understand how the multiplication actually works.

I did try to simply convert the private key (0x18E14A7B6A307F426A94F8114701E7C8E774E7F9A47E2C2035DB29A206321725 -> 11253563012059685825953619222107823549092147699031672238385790369351542642469) and multiply it by base point Gx (55066263022277343669578718895168534326250603453777594175500187360389116729240) which gives us BD4FD5FB7A2267DCBAFA00828EF916804FE307BE10C66D70DF06E7504A7252B5ACA70B176876047 473923124DD35521DC45FF99FDC337551BCE746CC7AA10F8 (which is not the public key).