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Photography Math Center

Exposure ratios, image geometry, print density, storage and shoot budgets. 20 tools with purposes, formulas and worked examples.

Simple mode uses starting defaults for extra scenario controls. Advanced exposes those controls where available. Change an entry, then press Calculate.

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Formula, calculation steps & example

All 20 tools: purposes and formulas

Photo pixel count — Use the labeled measurements to calculate photo pixel count.
A × B (A, B, C refer to the labeled entries)
Photo aspect ratio — Use the labeled measurements to calculate photo aspect ratio.
A ÷ B (A, B, C refer to the labeled entries)
Print width from PPI — Use the labeled measurements to calculate print width from ppi.
A ÷ B (A, B, C refer to the labeled entries)
Print height from PPI — Use the labeled measurements to calculate print height from ppi.
A ÷ B (A, B, C refer to the labeled entries)
Sensor diagonal — Use the labeled measurements to calculate sensor diagonal.
sqrt(A² + B²) (A, B, C refer to the labeled entries)
Diagonal crop factor — Use the labeled measurements to calculate diagonal crop factor.
A ÷ B (A, B, C refer to the labeled entries)
Equivalent field-of-view focal length — Use the labeled measurements to calculate equivalent field-of-view focal length.
A × B (A, B, C refer to the labeled entries)
Whole photos in capacity — Use the labeled measurements to calculate whole photos in capacity.
floor(A ÷ B) (A, B, C refer to the labeled entries)
Shoot storage budget — Use the labeled measurements to calculate shoot storage budget.
A × B (A, B, C refer to the labeled entries)
Backup copies storage — Use the labeled measurements to calculate backup copies storage.
A × B (A, B, C refer to the labeled entries)
Printed image area — Use the labeled measurements to calculate printed image area.
A × B (A, B, C refer to the labeled entries)
Raw pixel payload — Use the labeled measurements to calculate raw pixel payload.
A × B × C (A, B, C refer to the labeled entries)
Timelapse frame count — Use the labeled measurements to calculate timelapse frame count.
floor(A ÷ B) (A, B, C refer to the labeled entries)
Timelapse playback duration — Use the labeled measurements to calculate timelapse playback duration.
A ÷ B (A, B, C refer to the labeled entries)
Shoot expense total — Use the labeled measurements to calculate shoot expense total.
A + B + … (A, B, C refer to the labeled entries)
Expense per delivered photo — Use the labeled measurements to calculate expense per delivered photo.
A ÷ B (A, B, C refer to the labeled entries)
Photography gross revenue per hour — Use the labeled measurements to calculate photography gross revenue per hour.
A ÷ B (A, B, C refer to the labeled entries)
Shoot gross margin — Use the labeled measurements to calculate shoot gross margin.
A ÷ B × 100 (A, B, C refer to the labeled entries)
Shutter-duration change in stops — Calculate shutter-duration change in stops from the labeled values.
Exposure-duration stops = log₂(new/old)
Aperture change in stops — Calculate aperture change in stops from the labeled values.
Ideal light gain stops = 2 × log₂(old f-number/new f-number)

Definitions and source references

Unit definitions and selected model references:

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