Shutter Speed
Calculate the perfect shutter speed for any photography scenario. Select lighting condition, aperture f-stop, and ISO sensitivity to get the exact exposure time needed for sharp, well-exposed photos with comparison charts.
About This Calculator
Our Shutter Speed Calculator helps photographers of all levels determine the correct shutter speed for any lighting condition. Whether you are shooting portraits, landscapes, sports, or astrophotography, this tool calculates the exact exposure time based on your chosen aperture and ISO settings using the standard exposure value formula.
The calculator uses the formula shutter speed = 100 × aperture² / (ISO × 2EV), where EV represents the exposure value of the scene lighting. This formula is derived from the APEX (Additive System of Photographic Exposure) system and is widely used in photographic exposure calculations. The result is displayed both as an exact decimal value and as the nearest standard shutter speed setting available on most cameras.
The chart tabs let you compare how changing ISO sensitivity or aperture affects the required shutter speed while keeping the other parameters fixed. This helps you make informed trade-offs between noise (ISO), depth of field (aperture), and motion blur (shutter speed) when composing your shot.
Regional Notes
India (IN): All Indian photographers can use this calculator with standard international aperture and ISO values. The Sunny 16 rule applies universally regardless of region. For astrophotography in India's dark sky reserves like Ladakh or the Himalayan regions, use the lower EV settings (-5 to -7) for accurate results.
United States (US): US photographers can use this calculator alongside the 500 rule for Milky Way photography. For sports photography common in US football and baseball fields, the EV +13 to +15 range covers most daytime stadium scenarios.
United Kingdom (UK): UK photographers working in variable overcast conditions will find the EV +12 to +14 range most useful for typical outdoor shooting. For indoor event photography common at UK weddings and gatherings, the EV +5 to +7 range provides accurate shutter speed estimates.
Frequently Asked Questions
What is shutter speed in photography?
Shutter speed is the length of time the camera shutter remains open to expose the camera sensor to light. It is measured in seconds or fractions of a second, such as 1/1000 s for fast action shots or 30 s for low-light long exposures. Faster shutter speeds freeze motion while slower speeds create motion blur effects.
How is shutter speed calculated?
Shutter speed is calculated using the formula: shutter speed = 100 x aperture squared / (ISO x 2 to the power of EV), where EV is the exposure value determined by the lighting condition. The calculator automatically applies this formula when you select the lighting condition, aperture f-stop, and ISO sensitivity.
What is the Sunny 16 rule?
The Sunny 16 rule is a classic photography guideline that states on a bright sunny day with clear skies, setting your aperture to f/16 and ISO to 100 will give you a shutter speed of approximately 1/100 or 1/125 s. This rule serves as a useful starting point for estimating exposure without a light meter.
What shutter speed should I use for portraits?
For portraits, a shutter speed of at least 1/125 s is recommended to freeze subject movement and avoid camera shake. If using a longer focal length above 50 mm, follow the reciprocal rule and use a shutter speed of at least 1 over the focal length (e.g., 1/200 s for a 200 mm lens).
What is the difference between fast and slow shutter speed?
A fast shutter speed (1/500 s or faster) freezes motion, making it ideal for sports, wildlife, and action photography. A slow shutter speed (1/30 s or slower) allows more light to reach the sensor, creating motion blur effects like silky waterfalls, light trails, or star trails. The right choice depends on your creative vision and available light.
How does ISO affect shutter speed?
Increasing the ISO sensitivity makes the camera sensor more responsive to light, allowing faster shutter speeds in the same lighting conditions. Each doubling of ISO (e.g., from 100 to 200) halves the required shutter speed. However, higher ISO values introduce digital noise or grain, so photographers balance ISO with image quality requirements.
What shutter speed is needed for astrophotography?
Astrophotography typically requires very slow shutter speeds of 10 to 30 seconds with a wide aperture (f/1.4 to f/2.8) and high ISO (1600 to 6400) to capture stars and the Milky Way. Use the 500 rule to avoid star trails: divide 500 by your focal length in mm to get the maximum shutter speed in seconds.
What is the reciprocal rule for hand-held photography?
The reciprocal rule states that the minimum shutter speed for hand-held photography should be at least 1 over the focal length of the lens. For example, with a 50 mm lens, use at least 1/50 s; with a 200 mm lens, use at least 1/200 s. Image stabilization can allow 2-4 stops slower shutter speeds.