ND Calculator

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Perfect Long Exposures, Every Time.
You've set up your tripod, screwed on your ND filter, and you're ready to shoot. But what's the right shutter speed? Guess wrong and you waste precious light — or worse, blow the shot.
ND Calculator takes the guesswork out. Instantly compute the exact shutter speed for any ND filter — single or stacked — and start your exposure with the built-in timer. No more mental math. No more ruined shots.

✨ What Makes It Great
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Smart ND calculator
— Enter your base shutter speed and ND filter strength. The app instantly shows the correct exposure in both decimal and photographer-friendly fractional format (e.g., 1/15s).
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Stack up to 5 filters
— Using multiple ND filters? Stack them in the app and see the combined effect instantly. The total stops are summed automatically.
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Built-in long exposure timer
— Set your calculated exposure time and start the countdown. Haptic feedback when it's done. No need for a separate stopwatch app.
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Calculation history
— Every calculation is saved automatically. Tap any past result to restore it to the calculator. Up to 20 entries stored.
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Your filters, your way
— Mark which ND filters you own. Toggle to show only your filters for faster, cleaner selection.
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Built-in learning
— New to ND filters? The Tutorials section covers everything from "what is an ND filter" to advanced stacking techniques. A random tip banner delivers fresh photography wisdom every time you open the app.
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15 languages
— Fully localized in English, Czech, German, Spanish, French, Greek, Hindi, Italian, Japanese, Korean, Dutch, Polish, Portuguese, Russian, and Chinese.
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Drone-ready
— Works with DJI, Autel, and other drone ND filters. Calculate the right shutter speed for cinematic aerial long exposures.
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Works offline
— No internet needed. No account. No sign-up. Just your camera and this app.

📷 How to Use
1. Set your base shutter speed (without filter) using the quick-select dial
2. Choose your ND filter — or stack up to 5 filters for combined strength
3. Read the calculated result — tap to start the timer if you're shooting long exposures

That's it. No accounts. No sign-ups. Just photography.

🎯 Who It's For
• Landscape and seascape photographers using ND filters
• Architecture photographers shooting long exposures in daylight
• Drone pilots using ND filters for cinematic aerial footage
• Photography students learning about exposure and filter stacking
• Any camera user tired of mental math in the field
• Workshop leaders and instructors teaching ND photography

Whether you shoot with a 3-stop for motion blur or a 10-stop for silky waterfalls, this app handles it all — including fractional stops and multi-filter stacks.

⭐ Why Photographers Love It
✅ Instant shutter speed calculation for any ND filter
✅ Stack up to 5 filters — total stops summed automatically
✅ Built-in countdown timer with haptic feedback
✅ Calculation history with one-tap restore
✅ Show only filters you own for faster workflow
✅ Tutorials and tips for all skill levels
✅ Works completely offline — no signal needed in the field
✅ Dark theme — easy on the eyes at night
✅ 15 languages supported
✅ No account needed — just download and shoot

⭐ Go PRO
Upgrade to remove all ads for a clean, distraction-free experience. One purchase. All the features. Better shooting.

⬇️ Download ND Calculator
Whether you're shooting your first long exposure or you've been stacking filters for years — welcome. Download free and start shooting with confidence.