Audio File Size Calculator

Estimate audio file sizes for MP3, WAV, FLAC, and AAC based on duration, sample rate, and bit depth.

Audio File Size Calculator Live Calculation
Estimated Audio File Size:
144.00 MB
In Gigabytes:0.144 GB
Bitrate:320 kbps
Audio Size Estimate: WAV calculations assume standard 2-channel stereo uncompressed PCM audio. FLAC is a variable lossless format achieving ~40-50% compression depending on audio dynamic range. MP3 calculations use constant bitrate (CBR) encoding metrics.

What is the Audio File Size Calculator?

Used by podcasters, sound engineers, and musicians to estimate recording drive needs and bandwidth costs for audio streaming.

How to Use This Tool

Choose audio format (MP3, WAV, FLAC, AAC), set duration in minutes or hours, and select quality bitrate or sample rate.

Formula & Calculation Logic

The mathematical formula used to calculate this conversion is:

Uncompressed PCM Size = (Sample Rate × Bit Depth × Channels × Duration in seconds) ÷ 8

Step-by-Step Example Calculation

Here is a real-world calculation example demonstrating the mathematics:

Example: 60-minute stereo audio at CD quality (44.1 kHz, 16-bit, 2 channels) Bytes = 44,100 × 16 × 2 × 3,600 ÷ 8 = 635,040,000 Bytes (635.04 MB decimal / 605.62 MiB binary WAV) As 320 kbps MP3: (320 × 3,600) ÷ 8 = 144 MB

Frequently Asked Questions

At standard speech quality (128 kbps stereo or 64 kbps mono), one hour of podcast audio is approximately 57.6 MB.

Uncompressed WAV files are approximately 5 to 10 times larger than high-quality 320 kbps MP3 files.