I can see the value my draft picks have for a trade. My question is where can I find out what the contract amount will be?

You can look at previous year's draft results, find the corresponding pick and see what their contract is. The cost in the current year will be slightly higher than the previous year.

Rookie contracts are based on draft position, and they don't have anything to do with position, so this will get you close regardless of what position you are targeting.

Somewhat the above .. I found myself with a few minutes to look at this using C10 as a guide

2026 1.1 Selection (bonus in parentheses):

2028 - 3,931,276 (3,565,783)
2029 - 4,127,840 (3,565,783)

2027 1.1 pick

2028 - 3,931,276 (3,744,073)
2029 - 4,127,840 (3,744,073)
2030 - 4,334,232 (3,744,073)

2028 1.1 pick (TBD) .. "Guesstimate":

2028 - 3,931,276 (3,931,277)
2029 - 4,127,840 (3,931,277)
2030 - 4,334,232 (3,931,277)
2031 - 4,550,944 (3,931,277)

Team salary caps go up .05% each year .. so do salaries.

4,334,232 x 1.05 = 4,550,943.60 (raise to the next dollar 4,550,944)

Bonus is also computed the same using last years bonus .. just multiply by 1.05