Enter the voltage and the time at 90% and 10% signal into the calculator to determine the slew rate.

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## Slew Rate Formula

The following formula is used to calculate a slew rate:

SR = (Vout(90%) – Vout (10%)/(t(90%) – t(10%)

- Where SR is the slew rate (V/s)(V/us)
- Vout is the voltage output at 90% and 10% respectively
- t(90%)-t(10%) is the change in time it took to go from 90% to 10% signal

## Slew Rate Definition

A slew rate is defined as the maximum rate of change of an op amp’s output voltage from a signal step of 90%-10%.

## Example Problem

**How to calculate slew rate? **

First, determine the output voltage at 90% signal. For this example, the voltage is found to be 10 volts at 90% signal.

Next, determine the output voltage at 10% signal. For this example, the output voltage at 10% signal is 2 volts.

Next, determine the change in the time it took to go from 90%-10% signal. For this problem, the total time is 10 microseconds (20us-10us).

Finally, calculate the slew rate using the formula above.

SR = (Vout(90%) – Vout (10%)/(t(90%) – t(10%)

= (10-2) / (20-10)

= .8 V/us.