The exposure triangle describes how aperture, shutter speed, and ISO work together to control the brightness of a photograph. When you change one setting, you must compensate with one or both of the others to maintain the same exposure. This calculator instantly shows all equivalent combinations and explains the visual tradeoffs of each adjustment.
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| Aperture | Shutter | ISO |
|---|---|---|
| Change a setting to see equivalent exposures | ||
How to Use the Exposure Triangle Calculator
The exposure triangle is one of the most fundamental concepts in photography. Every photograph is the result of three settings working together: aperture controls how much light the lens lets in, shutter speed controls how long the sensor is exposed, and ISO controls the sensor's sensitivity. When you change one, you must adjust another to keep the same brightness. This calculator makes those adjustments instant and visual.
Step 1: Set Your Current Exposure
Enter the aperture, shutter speed, and ISO you are currently using. These three values together define your baseline exposure. For example, a typical outdoor setting might be f/5.6, 1/250, ISO 100. The calculator accepts standard full-stop values from f/1.4 to f/22, shutter speeds from 30 seconds to 1/8000, and ISO from 100 to 12800.
Step 2: Choose Which Setting to Change
Select which of the three settings you want to adjust. If you want shallower depth of field, change the aperture. If you need to freeze fast motion, change the shutter speed. If lighting conditions changed, adjust the ISO. The exposure triangle calculator will then show you what the other two settings need to become.
Step 3: Select the New Value
Pick your desired new value from the dropdown. The calculator computes the stop difference between your original setting and the new one, then shows all equivalent exposure combinations that maintain the same brightness. Each combination is a valid option you can use.
Step 4: Review the Tradeoffs
Every adjustment has a visual consequence beyond brightness. A wider aperture gives shallower depth of field and more background blur. A slower shutter speed introduces motion blur, which can be creative or problematic. Higher ISO increases digital noise. The effects panel below the combinations table explains what each option means for your image quality so you can make an informed creative decision.
Understanding Stops
A "stop" is photography's standard unit for measuring light changes. One stop doubles or halves the light. Moving from f/5.6 to f/4 is one stop more light. Moving from 1/250 to 1/500 is one stop less light. The exposure triangle ensures that when you gain a stop on one side, you lose a stop on another to keep the exposure balanced. This calculator handles all the math for you.
Frequently Asked Questions
Is this exposure triangle calculator free?
Yes, this exposure triangle calculator is completely free. No account, signup, or download is required. All calculations run instantly in your browser with no data sent to any server.
Is my data private when using this tool?
Absolutely. Everything runs locally in your browser. No camera settings or calculations are transmitted, stored, or logged anywhere. You can use it offline once the page has loaded.
What is the exposure triangle?
The exposure triangle is a fundamental photography concept describing how aperture, shutter speed, and ISO work together to determine the brightness of a photo. Changing one setting requires compensating with another to maintain the same exposure level.
How do I maintain the same exposure when changing aperture?
When you widen the aperture by one stop (e.g., f/8 to f/5.6), you need to either increase the shutter speed by one stop or decrease the ISO by one stop. This calculator shows all equivalent combinations automatically.
What is a stop in photography?
A stop is a doubling or halving of the amount of light reaching the sensor. One stop wider aperture doubles the light, one stop faster shutter speed halves the light, and one stop higher ISO doubles the sensor sensitivity. Stops are the universal unit for measuring exposure changes.
How does ISO affect image quality?
Higher ISO values increase the sensor's sensitivity to light, allowing faster shutter speeds or smaller apertures in dim conditions. However, higher ISO also introduces more digital noise and can reduce image sharpness and dynamic range. Use the lowest ISO possible for the cleanest results.
What shutter speed do I need to avoid motion blur?
A common rule is the reciprocal rule: use a shutter speed of at least 1/focal-length. For a 50mm lens, shoot at 1/50s or faster. For action, aim for 1/500s or faster. This calculator helps you find equivalent settings that allow a faster shutter speed.
When should I use this calculator?
Use this calculator when you want to change one exposure setting but need to know how to compensate with the others. For example, if you want shallower depth of field (wider aperture), this tool shows what shutter speed and ISO adjustments will maintain the same brightness.