Calculators

Calculates your age based on a birth date and a reference date.

Calculates the length of a rolled-up rectangular sheet based on its diameter, core diameter, and number of rotations.

Calculates the Shannon Diversity Index (H') to quantify species diversity in a community. The index considers both the number of species and the evenness of their distribution.

Calculates the maximum allowable span for a wood beam based on load, beam dimensions, and wood species.

This calculator helps predict the next heat cycle for female dogs based on their previous cycle date and the average cycle length.

Estimates the birthing date for guinea pigs based on the date of conception.

Convert between different forms of garlic (cloves, minced, powdered) and scale recipes accurately.

Calculates battery capacity (e.g., in mAh or Wh) based on voltage and charge/discharge characteristics.

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

Performs a Z-test to compare a sample mean to a known population mean or to compare two sample means when population variances are known.