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The nerdy side of me would still like to know how to calculate it, lol.
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Ok lets use your example.
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: 200 yard line is 2" below the 100 yard, 300 yard line is 6.5" below, 400 line is 12"
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Assuming that this is looking at the reticle through your scope at 100 yards, and that you have a ruler hanging next to your target.
At 200 yards the reticle will subtend 2x as much as at 100 so the first line under the crosshair is 4 inches lower, the 2nd line is 13 inches lower, the 3rd line is 24 inches lower than the crosshair.
At 300 yards it subtends 3 times as much as at 100 so the first line is 6 inches below the crosshair, the second line is 19 1/2 inches below, the 3rd line is 36 inches below.
You can continue on using the hundreds of yards divided by 100 as your multiplier. Such as 225 yards distance to target, multiply the measurement at 100 yards by 2.25. Or x 5 if your distance to target is 500 yards.
Since your scope probably lists the reticle subtension in MOA you have to convert it. 1'MOA is about 1.05 inches at 100 yards. So if the scope manufacturer says the first line below the crosshair subtends 3 MOA multiply 3 x 1.05 = 3.15 inches at 100 yards.
If your gun can shoot accurately enough to need the .05 for calculations use it, if not the math is easier to use 1 inch as 1 MOA at 100 yards, 2 inches is 1 MOA at 200 yards and so on.