See: Crafting Guide
This applies for IC2 v1.71 for Minecraft 1.1 and up. Fall damage (d) is normally equal to the height (h) fallen minus 3. The boots reduce damage sustained by a factor of 8 rounded down. So...
d = (h - 3) / 8 (rounded down)
|Height||damage to player|
|0 - 10||0|
|11 - 18||1|
|19 - 26||2|
|27 - 34||3|
|35 - 42||4|
|43 - 50||5|
|163 - 170||20|
We have also observed that the maximum damage to boots is 64 (they break at 65) and the damage to boots(d) = (h-3) * 7/16, so falling 83 blocks for example causes 35 damage to boots. The maximum height to fall without destroying the boots is 150.
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