ND Filter Calculator
A neutral density filter darkens the light reaching your sensor by a set number of stops, which lets you use much longer shutter speeds in daylight for silky water, blurred clouds, and empty streets. Each stop of ND doubles the required exposure time, so the math grows fast. This calculator takes your base shutter speed without a filter and the strength of your ND filter and returns the correct new shutter speed. Choose a common filter such as a 6 stop or 10 stop, or type any number of stops, and it also accepts the ND number notation like ND1000. When the result runs past thirty seconds it reminds you to switch to bulb mode with a timer or remote. This removes the guesswork and the risk of a ruined long exposure. All the math happens in your browser, so nothing you enter is sent anywhere.
How to use ND Filter Calculator
- Enter your base shutter speed without the filter.
- Enter the ND filter strength in stops.
- Read the new long exposure shutter time.
- Switch the camera to bulb mode if the time exceeds 30 seconds.
Frequently asked questions
How does an ND filter change shutter speed?
Each stop of neutral density halves the light, so the tool doubles your base shutter time per stop. A 10 stop filter multiplies the exposure by 1024.
What do ND numbers mean?
ND filters are labelled by stops or by density, where ND8 is 3 stops, ND64 is 6 stops, and ND1000 is about 10 stops. The tool accepts stops directly.
Why use one for long exposures?
ND filters cut light enough to use very slow shutter speeds in daylight, smoothing water and clouds without overexposing the image.
What is ND Filter Calculator?
A neutral density filter darkens the light reaching your sensor by a set number of stops, which lets you use much longer shutter speeds in daylight for silky water, blurred clouds, and empty streets. Each stop of ND doubles the required exposure time, so the math grows fast.
Is ND Filter Calculator free to use?
Yes. ND Filter Calculator is completely free, with no sign-up and no usage limits.
Does ND Filter Calculator work in a web browser?
Yes. ND Filter Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with ND Filter Calculator?
Yes. ND Filter Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/nd-filter-calculator)