Nethog's Pricing Analysis - Rush Build Costs (pdf)

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Nethog's Pricing Analysis - Rush Build Costs (pdf)

The chart helps you calculate the exact amount of energy to spend for a partial rush build so that the unit is completed on the next turn. If you use the amount that the game suggests you can waste a lot of energy.
The file is in .pdf format (you can use this to open it).

Link to downloads entry: http://alphacentauri2.info/index.php?action=downloads;sa=view;down=94

Direct download link:




Here is the rush build formula:

Cost = (M*M)/20 + 2*M
(where M is the number of mins you need to complete the build - doubled if you don't already have the first 10 mins). The game rounds this down to the nearest integer if you buy the full amount; if you buy a partial amount you have to round up the fractional ec's.

If you are looking for things you can conceiveably remember or maybe do in your head, there is a simpler approach which waste a little, but not too much and is easy to remember:

If you need 10 mins (1 standard row), it costs 25 or 2.5 each;
if you need 20 mins (2 standard rows), it costs 60 or 3.0 each;
if you need 30 mins (3 standard rows), it costs 105 or 3.5 each;
if you need 40 mins (4 standard rows), it costs 160 or 4.0 each;
in other words, for each extra row, the unit cost goes up by 0.5 ecs.
If you just pay that amount, you will always have enough (unless you don't have the 1st ten yet) and will only waste a few ecs.