In order to use this, you'll need your ISP number. From there, you can calculate your Delta V, which is what you need for a mission.
For example, for 5000 ISP fission fragment rocket discussed recently, you'll need to use about 5 metric tons of reaction mass. Not bad. This would propel a 100 metric ton spacecraft to a delta v of about 2.5 km sec. Depending on where you start, this could be enough to do a mission to Mars.
The starting point would be the lagrange point between the earth and moon.
Rocket Equation Calculator
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