Photography Calculators
Aspect Ratio Crop Calculator
Calculate the largest possible crop dimensions at a target aspect ratio (1:1, 4:5, 16:9, and more) from your original photo resolution.
Camera Battery Shots Remaining Calculator
Estimate how many shots remain on your camera battery based on remaining battery percentage and the rated CIPA shot count.
Camera Crop Factor Calculator
Compute sensor crop factor from sensor dimensions, plus full-frame-equivalent focal length and aperture, for cross-format lens and camera comparisons.
Camera Exposure Calculator
Convert aperture, shutter speed, and ISO into an EV100 exposure value for comparing exposures across different cameras and lighting conditions accurately.
Camera Focal Length Calculator
Convert between focal length and horizontal angle of view for any sensor width, in either direction, for lens selection and shot framing planning.
Flash Guide Number Calculator
Calculate the required aperture for correct flash exposure based on a flash's guide number and subject distance.
Golden Hour Calculator
Work out morning and evening golden hour windows from today's sunrise and sunset times, for planning portrait, landscape, and film shoot schedules in advance.
Hyperfocal Distance Calculator
Calculate the hyperfocal distance from focal length, aperture, and sensor format to maximize depth of field in landscape and street photography.
Image Compression Calculator
Estimate uncompressed and compressed image file size from pixel dimensions, color mode, and compression ratio, for storage, backup, and upload planning.
Image DPI Calculator
Find the DPI a given pixel resolution yields at a target print size, or the pixel resolution required to hit a target DPI and print size, in either direction.
ISO Exposure Calculator
Determine the equivalent shutter speed or aperture needed after an ISO change to keep total exposure constant, with the underlying stop math shown.
Memory Card Photo Capacity Calculator
Calculate approximately how many photos fit on a memory card based on card capacity and average photo file size.
ND Filter Exposure Calculator
Calculate the correct new shutter speed after adding a neutral density (ND) filter, based on the filter's stop value.
Panorama Field of View Calculator
Calculate the total field of view of a stitched panorama based on single-frame field of view, number of frames, and overlap percentage.
Photography Depth of Field Calculator
Calculate exact near and far depth-of-field limits from focal length, aperture, subject distance, and sensor format, plus the hyperfocal distance behind them.
Photography Session Pricing Calculator
Calculate a recommended photography session price including shooting time, editing time, and equipment or travel costs.
Portrait Lighting Ratio Calculator
Calculate the lighting ratio between key and fill lights for portrait photography based on light meter f-stop readings.
Print Size DPI Calculator
Convert pixel dimensions and target DPI into maximum print size in inches and centimeters, for checking a file before ordering a print at a lab.
Reciprocal Rule Shutter Speed Calculator
Calculate the minimum handheld shutter speed needed to avoid camera shake blur, based on lens focal length and sensor crop factor.
Required Megapixels for Print Calculator
Calculate the minimum camera megapixels needed to print a photo at a given size and DPI without quality loss.
Everything After the Shutter Click Is Math
A photo's sharpness, exposure, and print quality all come down to calculable relationships between aperture, focal length, and sensor or print size — not just instinct behind the camera. These ten calculators cover that technical side of photography.
Finding Hyperfocal Distance, Step by Step
- Note your focal length and aperture. For example, a 35mm lens at f/8.
- Note your camera's circle of confusion value. This is a sensor-size-dependent constant representing the largest acceptably sharp blur spot, typically a small fraction of a millimeter.
- Apply the hyperfocal distance formula. Hyperfocal distance = (focal length² ÷ (aperture × circle of confusion)) plus focal length.
- Focus at that distance. Everything from roughly half that distance to infinity will render acceptably sharp — useful for landscape shots where you want maximum depth of field without guessing.
Run this instantly with the Hyperfocal Distance Calculator, or check depth of field directly with the Photography Depth of Field Calculator.
Popular Photography Calculators
- Camera Exposure Calculator — balances ISO, aperture, and shutter speed for a target exposure value.
- Print Size DPI Calculator — checks whether an image's resolution supports a target print size at acceptable quality.
- Golden Hour Calculator — finds the golden hour time window for a given date and location.
Related: Video Calculators, Printing Calculators for output-side math.