← All tools
Free calculator
ND Filter Calculator
Choose your ND filter and tap your base shutter speed — get the corrected long-exposure time instantly, with a full cheat-sheet table.
16s
corrected shutter speed
ND filter ND64 — 6 stops
ND2ND64ND1000ND32k
Base shutter speed 1/4s
Or type seconds:
Exposure time comparison
¼s
Base speed
×64
Multiplier
16s
New speed
16s
New shutter speed
Set this on your camera
×64
Multiplication factor
2 to the power of stops
6 stops
Light blocked
ND64 filter
0.25s
Base speed
Without filter
Base speed
With ND
Factor
Shooting tip
Calculating…
Each stop of ND doubles the exposure. ND64 (6 stops) = 64× longer. Formula: New time = Base × 2ⁿᵗᵒᵖᵜ