Calculators

Calculates equivalent focal lengths considering sensor size (crop factor) or helps choose lenses.

Calculates the range of distance in a photo that appears acceptably sharp, based on focal length, aperture, subject distance, and sensor size.

Calculates the theoretical maximum speed of a displacement hull boat based on its waterline length.

Calculates age based on the Gregorian calendar and two different lunar calendars (Chinese and Islamic).

Estimates the charging time for a battery based on its capacity, the charger's output current, and the battery's initial charge level.

Calculates the phase of the Moon for a given date.

Explore global events and statistics unfolding around the world at different time intervals.

Calculates the time difference between two dates, providing results in days, weeks, and years.

This calculator allows you to add or subtract days, months, and years from a given date.

Calculates the number of years between a BC (Before Christ) date and an AD (Anno Domini) date.