Tsiolkovsky derived in early 20 century equation for accelerated by reactive propultion body:
v=vexaustln(mo/m), where vexaust is the velocity of burning fuel exaust gases, mo is initial mass of rocket, and m -its final mass (payload).

Plugging typical exaust velocity 2 miles/sec and typical ratio of fuel-to payload masses in 20-30 range, you get velocity of a rocket in 6-7 miles per second range which is about 35,000 - 40,000 km/h, and is more than enough to circle the Earth.

More fuel will bring you to Moon, Mars, etc.

It seems that the guy who claims the opposite on that web site needs to learn a little more mechanics.