Translating RMs

I wonder if anyone knows how to translate %-RM to reps-RM?

For example, i?m now on ABBH2 and knows what my 7RM is. When it?s time to change to 15RM for that excercise, what weight should be a good place to start if i used % of my 1RM?
Can it be done, or is it to many factors inwolved that make?s it to inaccurate?

Jesus, my english is really rusty.

This might not copy and paste all that well, but here goes.

%1RM* 100 95 93 90 87
---------85 83 80 77 75
---------70 67 65

Reps 1 2 3 4 5 6 7 8 9 10 11 12 15

Match the top category with the bottom one.

Thanks, or “Tack” as we say in Sweden.

I guess that 1%RM is useless when trying to figure out my 24RM, 30RM and so forth?

I’ve complained about that a few times already.
nobody has a 25 RM at least not a consistent one.
Start with about 40% of your 1RM. Others have suggested 50% but I find that long sets take some getting used to and its better to start a bit light and work up than to start too heavy and wonder how anyone ever completes a set. You can always add more weight the next time …

Check out my friend’s 1RM calculator at www.solopro.com

It works pretty good. Just put in the weight you use for a particular lift and how many reps you can do. It’ll give you a number based on that. From my experience, it has been pretty much right on.