Real Time Clock (RTC) Online Calculator

App description

The calculator converts the clock precision parts per
million (PPM) into real-time accuracy expressed in seconds
per day or minutes per year.

Input parameters: PPM, seconds/day or minute/year, click the
“Calculate” button to get other calculated values.

Usage example

Input data: error (PPM): 5.8

Click on "Calculate", seconds / day: 0.5; minutes / year: 3.05

Working temperature: 25 ° C

Note

The calculator determines the crystal frequency error (PPM) caused
by the crystal temperature characteristics;
in addition, the equivalent error value in seconds per day is given.

The frequency error (PPM) produced by the crystal temperature
characteristics can be calculated using the formula:
-0.042* (25-operating temperature) ².