How can I calculate how much my rockets will be able to bring into different orbits.

[SpaceFace545]

So I am playing on JSQ with BDB rockets and I like to make notes on which rockets can carry whatever weight so I know what to use. But is there a way to calculate the payload to different orbit heights? maybe a calculator, formula, or simple trick. Thanks

[Caerfinon]

The "Cheat Sheet" has a lot of useful math on the subject.

https://wiki.kerbalspaceprogram.com/wiki/Cheat_sheet

 

[SpaceFace545]

29 minutes ago, Caerfinon said:

The "Cheat Sheet" has a lot of useful math on the subject.

https://wiki.kerbalspaceprogram.com/wiki/Cheat_sheet

 

I’m sorry but I’m an idiot when it comes to this sorta stuff so what exactly would I use. I’m assuming I would calculate the true deltav and then add mass till it has less than the required amount to get to LKO. Im also using JNSQ so what value could I use for the amount of deltav needed to escape the atmosphere?

Edited March 20, 2021 by SpaceFace545

[Empiro]

Yes, you have the right idea. The thread for JNSQ has a delta-V map, so you should use that. I believe it takes 5000 m/s to reach Kerbin's orbit.

The only caveat is that if any stage's TWR ever becomes too low (especially before you get into LKO), then your rocket may use up more delta-V or even fail to reach orbit.

[Caerfinon]

1 hour ago, SpaceFace545 said:

JNSQ

Use the Delta V map they provide in the forum post for JNSQ and make sure your TWR on the lower stages are between 1.5 and 1.6  (can be less on upper stages as you approach the edge of the atmosphere.