f/stop Timing Calculator
Enter a base exposure time; results show extra time needed (Δ) for each ⅓-stop step. Click any value to add it to the summary. Use arrows to shift by ⅓-stop.
Seven cells show Δ time at −1 stop, −⅔, −⅓, 0, +⅓, +⅔, and +1 stop, shifted by the arrows. Values are extra seconds to add (burn) or subtract (dodge) from the base.