Real-Time Clock Calculator

Use this calculator to convert between formats for time-keeping accuracy measurements and to determine the crystal frequency error as a function of the temperature response of the crystal.
Enter Operating Temperature  °C
Enter Deviation (enter only one, the other two will be calculated):
or  Seconds/Day
or  Minutes/Year
Temperature-Dependent Calculations:
  Crystal Frequency Error    PPM    sec/day  
  DS3231, DS3232, DS3234 Accuracy ± PPM  

Enter desired operating temperature. Enter desired deviation in ppm, sec/day, OR min/yr. Click the 'calculate' button next to your entry to calculate the corresponding accuracy and error measurements.
Note: Temperature dependent crystal frequency error in ppm is determined using the formula:
Error (ppm) = -0.042(25 - OperTemp)²