Black & White Filter Calculator

See how colour filters affect black and white film, and see what exposure compensation is needed.

See how a coloured filter changes the tones in a black and white photo, then get the exposure adjustment it needs.

Choose a filter

No filter

Compare with and without the filter

Drag the slider to compare. Your own photo stays on your device and is never uploaded.

How colours turn to grey

Each swatch shows the colour, then its grey tone without and with the filter.

Metered shutter speed

Metered aperture

Also on the lens

Meter without the filter on the lens, then use these settings.

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