How do you calculate how much delta v is lost from gravity and atmospheric drag?(adsbygoogle = window.adsbygoogle || []).push({});

I've been looking for days but I can't find anything that actually tells me how it's calculated.

For example it takes 1.5 km/s - 2 km/s extra delta v for a low earth orbit because of drag loss, how was that number calculated?

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# Calculating delta v loss

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