Media calculator
Audio File Size Calculator
Estimate compressed audio from bitrate or uncompressed PCM/WAV from sample rate, bit depth and channels.
How this calculation works
Compressed audio size follows duration × bitrate. Uncompressed PCM size follows duration × sample rate × bit depth × channels. Headers and metadata add a small amount beyond the raw estimate.
Good to know
Frequently asked questions
Does channel count change compressed size?
Not directly when you already know the final bitrate: that bitrate is the whole stream budget. Channel count is required for raw PCM because every channel stores its own samples.
Why is WAV much larger than MP3 or Opus?
Typical WAV stores uncompressed PCM samples, while MP3 and Opus reduce data using lossy compression.