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Use our Exposure Time Calculator to quickly find the correct shutter speed. Easy, fast, and accurate for photography beginners and pros alike.
Photography is all about capturing the right moment with the perfect light. One key factor in this is exposure time, also known as shutter speed. Using the wrong exposure can make your photo too dark or too bright. That’s why we developed the Exposure Time Calculator – so you can easily calculate the correct shutter speed for any scene.
Whether you’re a beginner or a pro, this tool saves time and ensures your photos look just right.
Exposure time is the length of time your camera’s shutter stays open. It controls how much light hits the camera sensor. Too short, and your photo is dark. Too long, and it becomes overexposed.
It’s measured in seconds or fractions of a second. For example, 1/250 means the shutter is open for one two-hundred-fiftieth of a second.
The Exposure Time Calculator uses the standard photography formula:
t = (K × N²) / (L × S)
Where:
This formula ensures your shutter speed is perfect for the light conditions, aperture, and ISO you choose.
Using our calculator is simple:
For example, if you set an aperture of 5.6, ISO 400, and luminance 500 cd/m², the calculator will give an exposure time of roughly 0.002 seconds or 1/500.
It’s fast, accurate, and easy to use even if you’re just starting photography.
Manually figuring out exposure time can be tricky. You need to balance aperture, ISO, and light conditions. Our tool simplifies this and avoids mistakes. It’s especially useful for:
It also helps you experiment with creative effects without guessing.
The Exposure Time Calculator is a must-have tool for photographers. It saves time, improves accuracy, and makes photography more fun. You don’t need complex formulas or guesswork anymore. Just enter your values, and get the perfect shutter speed instantly.
Usually, 1/125 to 1/500 of a second works well. But it depends on your aperture and ISO.
Yes. Understanding exposure time helps you set frame rates and motion blur in videos.
It supports cd/m², nit, and foot-lamberts (fL). It converts all values to a standard unit for calculation.
Most of the time, the default 12.5 works. Change it only if your meter or situation requires it.