Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Photography
Exposure Value Calculator
Computes the Exposure Value (EV) at ISO 100 from aperture and shutter speed, giving a single number that represents the total light reaching the sensor. Use it to compare exposure settings or match lighting conditions across scenes.
Fill in the required fields to see your result.
Photography
Flash Guide Number Calculator
Calculates the correct aperture (or maximum distance) for a manual flash given its guide number and the flash-to-subject distance. Indispensable for manual flash photography without TTL metering.
Fill in the required fields to see your result.
Key differences
| Exposure Value Calculator | Flash Guide Number Calculator | |
|---|---|---|
| Category | Photography | Photography |
| Inputs required | 2 | 2 |
| Result | Exposure Value (EV) | Required Aperture (f/) |
| What it does | Computes the Exposure Value (EV) at ISO 100 from aperture and shutter speed, giving a single number that represents the total light reaching the sensor. Use it to compare exposure settings or match lighting conditions across scenes. | Calculates the correct aperture (or maximum distance) for a manual flash given its guide number and the flash-to-subject distance. Indispensable for manual flash photography without TTL metering. |