Okay, first of all, it's not "MF", "UF", or "PF". It's "μF", "nF" and "pF". They stand for microfarad, nanofarad, and picofarad, respectively. "microfarad" used to be labeled as "MF", which was absolutely wrong. That means "megafarad", in our prefixes today, which means a million farads. To my knowledge, there has never been a capacitor with a capacitance that high. "micro" means 10^-6, so one microfarad is actually 0.000001 farads. Nano is 10^-9, so 0.000000001 farads, or .001 microfarads. Pico is 10^-12, and I'm not even going to write that out
You get the picture though. 0.018μF is the same as 18nF, or 1800pF.
If you're working on a Tesla coil, I feel obliged to warn you of the dangers. Even if the output isn't deadly, the tank circuit is, and the streamers could create a low-resistance path for deadly current to enter your body. You must be EXTREMELY cautious with these things, and I recommend you have a buddy whenever you're working on or near one. I can't stress enough how many dangers there are, and I hope you take every necessary precaution to protect yourself, others, and property.
Regards,
Der Strom