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The list below gives actual values for exposure increase when using filters with B/W film. Example: f8 at 1/125th becomes f4 at 1/125th when using an orange filter in daylight (+2 stops). These increases apply only when using a hand-held meter or when using the camera's meter without the filter in place.
Pale Yellow (8)
Daylight: +1 stop
Tungsten: +2/3 stop
Yellow (15)
Daylight: +1 1/3 stops
Tungsten: +2/3 stop
Orange (21)
Daylight: +2 stops
Tungsten: +1 stop
Red (25)
Daylight: +3 stops
Tungsten: +2 2/3 stops
Deep Red (29)
Daylight: +4 1/3 stops
Tungsten: +3 1/3 stops
Yellow-Green (11)
Daylight: +2 stops
Tungsten: +2 stops