Not sure where to leave this, so I picked the Off Topic forum http://imgur.com/SqdzxzF Re-shared from Winchell Chung, don't remember who the original source was. Slightly more usable for me than those awesome porkchop plots that someone had put up, but of course also more abstract. There are some built in assumptions that you could spend more DV and get there sooner by taking a more direct route, or spend less DV and get there later by using more economical gravity assists and such -- but I'm not sure if there is a practical rule of thumb for what to multiply things by in the different situations, how long the average wait for a launch window is, etc. Like I said, not as good as the porkchop plots. But far more game-able if you just want to know how big your rocket is.