Bend allowance: A*(pi()/180)*(R + K*t)
A=angle(°), R=radius, K=k-factor, T=thickness

Aluminium
Radius Thickness .032" .063" .100" .125"
.030" 0.398 0.404 0.406 0.407
.060" 0.394 0.402 0.381 0.407
.090" 0.391 0.401 0.380 0.406
.120" 0.391 0.401 0.380 0.406
.188" 0.392 0.401 0.380 0.406
Cold-Rolled Steel
Radius Thickness .048" .060" .093"
.030" 0.438 0.467 0.459
.060" 0.433 0.463 0.457
.090" 0.433 0.463 0.456
.120" 0.433 0.463 0.456
.188" 0.420 0.453 0.450
Stainless Steel
Radius Thickness .029" .078"
.030" 0.483 0.449
.060" 0.479 0.446
.090" 0.475 0.446
.120" 0.475 0.446
.188" 0.454 0.438

* Source: Machinery's Handbook, 26th Edition

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