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UART Baud Rate Calculator
Calculate UART baud rate error from a clock frequency and divisor, with byte timing.
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Calculate UART baud rate error from a clock frequency and divisor, with byte timing.
UART Baud Rate Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: Divisor = round(clock / (oversampling x baud)); actual = clock / (oversampling x divisor).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
UART Quick Guide
Typical values for reference.
| Clock MHz | Baud | Oversample | Actual |
|---|---|---|---|
| 16 | 9600 | 16 | 9,615 baud |
| 16 | 57600 | 16 | 58,824 baud |
| 16 | 115200 | 16 | 111,111 baud |
| 16 | 921600 | 16 | 1,000,000 baud |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
UART Baud Rate Calculator FAQ
Answers to common questions about this calculator.
The number of symbols per second on a serial line.
Under 2 percent.
Eight data bits, no parity, one stop bit.
It lets the receiver sample mid-bit.