Mix two foundation shades and see each one's share.
Blending two foundations produces an intermediate tone, and each shade's share is its volume as a fraction of the total. Custom-blending a shade that matches better than either bottle alone is a common trick for seasonal skin tone changes.
Foundation Shade Mixing
Shade A share = A volume / (A + B) x 100
Shade A share = A volume / (A + B) x 100 Blending two foundations produces an intermediate tone, and each shade's share is its volume as a fraction of the total.
Custom-blending a shade that matches better than either bottle alone is a common trick for seasonal skin tone changes.
This calculator takes 2 inputs: Shade A volume, Shade B volume. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.