### Quick Answer

**Calculating the bit error rate involves dividing the number of bit errors by the total number of transferred bits during a fixed time interval.** Bit error rate, or bit error ratio, is a unitless measure expressed as a percentage.

### Full Answer

Bit error rate is one of the best ways to measure the quality of a digital transmission. It is affected by the following factors:

- Noise
- Interference
- Distortion
- Attenuation
- Bit synchronization problems
- Wireless multipath fading