Baud Rate Calculator

Baud	Bit time	Frame (8N1)
110	9.091 ms	90.909 ms
300	3.333 ms	33.333 ms
600	1.667 ms	16.667 ms
1,200	833.333 µs	8.333 ms
2,400	416.667 µs	4.167 ms
4,800	208.333 µs	2.083 ms
9,600	104.167 µs	1.042 ms
14,400	69.444 µs	694.444 µs
19,200	52.083 µs	520.833 µs
38,400	26.042 µs	260.417 µs
57,600	17.361 µs	173.611 µs
115,200	8.681 µs	86.806 µs
230,400	4.340 µs	43.403 µs
460,800	2.170 µs	21.701 µs
921,600	1.085 µs	10.851 µs

Baud

Bit time

Frame (8N1)

110

9.091 ms

90.909 ms

300

3.333 ms

33.333 ms

600

1.667 ms

16.667 ms

1,200

833.333 µs

8.333 ms

2,400

416.667 µs

4.167 ms

4,800

208.333 µs

2.083 ms

9,600

104.167 µs

1.042 ms

14,400

69.444 µs

694.444 µs

19,200

52.083 µs

520.833 µs

38,400

26.042 µs

260.417 µs

57,600

17.361 µs

173.611 µs

115,200

8.681 µs

86.806 µs

230,400

4.340 µs

43.403 µs

460,800

2.170 µs

21.701 µs

921,600

1.085 µs

10.851 µs

UART timing analysis made easy

Calculate bit times, frame sizes, baud rate error for your crystal, or STM32 BRR prescaler values. A standard baud rate reference table is included for quick lookup.

Frequently asked questions

What is baud rate?

Baud rate is the number of symbol changes per second in a communication channel. For binary UART, 1 baud = 1 bit per second, so 9600 baud means 9600 bits per second.

What baud rate error is acceptable?

For UART communication, a baud rate error under 2% is generally acceptable. Above 3–5%, framing errors and data corruption can occur, especially with long frames.

Why do baud rates like 9600 and 115200 exist?

Standard baud rates are derived from UART crystal frequencies (e.g., 1.8432 MHz) that divide evenly to produce common rates. Crystals like 11.0592 MHz were chosen specifically because they produce 0% error at standard baud rates.

UART timing analysis made easy

Frequently asked questions

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