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Sunny 16 Rule Calculator
Estimate exposure outdoors without a light meter.
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How it works
On a sunny day, f/16 with a shutter speed of 1 ÷ ISO gives a good exposure. Each step darker in the lighting list opens up one more stop, from f/16 to f/11, f/8, f/5.6, and f/4. The tool then shifts the time to match the aperture you choose. It is a reliable backup for film cameras and when the meter fails. Example: At f/8 and ISO 100 in full sun, use about 1/400 s.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.