Bitrate Calculator
Calculate video and audio bitrate from file size and duration, or estimate file size from a target bitrate with our free bitrate calculator. Supports Kbps, Mbps, MB, and GB - enter duration in seconds or HH:MM:SS format. All calculations run locally in your browser. No signup required.
Calculate video or audio bitrate from file size and duration, or estimate the file size you need for a target bitrate. All calculations run locally in your browser - no signup required.
Enter the total file size
HH:MM:SS or seconds
| Format | Bitrate | 1 min file size | Note |
|---|---|---|---|
| Audio MP3 (128 Kbps) | 128 Kbps | 0.94 MB | Standard quality |
| Audio MP3 (320 Kbps) | 320 Kbps | 2.34 MB | High quality |
| Audio AAC (256 Kbps) | 256 Kbps | 1.88 MB | iTunes / streaming |
| Video 480p H.264 | 1 Mbps | 7.32 MB | SD streaming |
| Video 720p H.264 | 2.5 Mbps | 18.31 MB | HD streaming |
| Video 1080p H.264 | 5 Mbps | 36.62 MB | Full HD streaming |
| Video 1080p H.265 | 2.5 Mbps | 18.31 MB | Full HD (HEVC) |
| Video 4K H.264 | 20 Mbps | 146.48 MB | Ultra HD streaming |
| Video 4K H.265 | 10 Mbps | 73.24 MB | Ultra HD (HEVC) |
Why Use Our Bitrate Calculator?
Instant Bitrate Calculation
Calculate video and audio bitrate from file size and duration instantly in your browser. Our bitrate calculator processes every input in real time - no waiting, no signup required.
Secure Bitrate Calculator Online
All calculations happen locally in your browser using JavaScript. Your file sizes and project details never leave your device, ensuring 100% privacy when you use our bitrate calculator online.
Bitrate Calculator Online - No Installation
Use our bitrate calculator directly in your browser with no downloads, plugins, or software required. Calculate bitrates and file sizes for any video or audio project from any device.
Two-Way Calculation & Reference Table
Calculate bitrate from file size and duration, or estimate file size from a target bitrate. Includes a built-in reference table with recommended bitrates for common formats - MP3, AAC, 480p, 720p, 1080p, 4K H.264, and H.265.
Common Use Cases for Bitrate Calculator
Video Encoding & Compression
Video editors use our bitrate calculator to determine the right encoding bitrate for a target file size. Enter the desired file size and video duration to get the exact bitrate to set in Handbrake, FFmpeg, or Adobe Media Encoder.
Streaming Platform Optimization
Content creators use our bitrate calculator to optimize uploads for YouTube, Twitch, and Vimeo. Calculate whether your source file meets the platform's recommended bitrate before uploading.
Storage Planning
Videographers and archivists use our bitrate calculator to estimate how much storage they need for a recording session. Enter the target bitrate and total recording duration to get the estimated file size in MB and GB.
Podcast & Audio Production
Podcast producers use our bitrate calculator to plan episode file sizes for hosting platforms. Calculate the file size of a 60-minute episode at 128 Kbps, 192 Kbps, or 320 Kbps before exporting.
Network Bandwidth Planning
Network engineers use our bitrate calculator to plan bandwidth requirements for video streaming infrastructure. Convert between Kbps, Mbps, and file sizes to size CDN capacity and storage correctly.
Quality vs. File Size Trade-offs
Developers and media engineers use our bitrate calculator's comparison table to evaluate quality vs. file size trade-offs across different bitrates for the same duration - helping choose the optimal encoding settings.
Understanding Bitrate, File Size, and Duration
What is Bitrate?
Bitrate is the amount of data processed per second in a video or audio stream, measured in Kbps (kilobits per second) or Mbps (megabits per second). Higher bitrate means more data per second, which generally means better quality - but also a larger file size. The relationship between bitrate, file size, and duration is: File Size (bits) = Bitrate (bps) × Duration (seconds). Our bitrate calculator uses this formula in both directions - calculate bitrate from a known file size, or estimate file size from a target bitrate.
How Our Bitrate Calculator Works
- 1. Choose Your Calculation Mode: Select "Calculate Bitrate" to find the bitrate of an existing file, or "Estimate File Size" to plan the storage needed for a target bitrate. Switch between modes with the toggle at the top of the calculator.
- 2. Enter File Size or Bitrate and Duration: For bitrate mode: enter the file size (KB, MB, or GB) and the duration (in seconds or HH:MM:SS format). For file size mode: enter your target bitrate (Kbps or Mbps) and the duration. All inputs update the result instantly.
- 3. Read the Results and Reference Table: The bitrate calculator shows the total bitrate in Kbps and Mbps, file size in KB, MB, and GB, and a comparison table showing file sizes at common bitrates for the same duration. All calculations run locally in your browser.
Bitrate Calculation Formulas
- Bitrate from File Size: Bitrate (Kbps) = (File Size in KB × 8) ÷ Duration in seconds. Multiply KB by 8 to convert bytes to bits, then divide by duration to get bits per second.
- File Size from Bitrate: File Size (KB) = (Bitrate in Kbps × Duration in seconds) ÷ 8. Multiply bitrate by duration to get total bits, then divide by 8 to convert to bytes (KB).
- Unit Conversions: 1 MB = 1,024 KB · 1 GB = 1,024 MB · 1 Mbps = 1,000 Kbps · 1 byte = 8 bits. The bitrate calculator handles all unit conversions automatically.
- Data Rate per Minute: Data per minute (MB/min) = File Size (MB) ÷ Duration (minutes). Useful for estimating storage needs for long recordings at a given bitrate.
Recommended Bitrates for Common Formats
For audio, 128 Kbps MP3 is standard quality, 320 Kbps is high quality, and 256 Kbps AAC is used by Apple Music and Spotify. For video, 1080p H.264 typically uses 4-8 Mbps for streaming and 15-50 Mbps for editing. H.265/HEVC achieves the same quality at roughly half the bitrate of H.264. For 4K, 15-25 Mbps is typical for H.264 streaming and 8-12 Mbps for H.265. These are guidelines - actual quality depends on the encoder, content complexity, and codec settings.
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Frequently Asked Questions About Bitrate Calculator
What is a bitrate calculator?
A bitrate calculator is a tool that computes the data rate of a video or audio file. Our bitrate calculator can work in two modes: calculate bitrate from a known file size and duration, or estimate the file size you need for a target bitrate and duration - all instantly in your browser.
What is bitrate and why does it matter?
Bitrate is the amount of data processed per second in a video or audio stream, measured in Kbps or Mbps. Higher bitrate means better quality but larger file size. Our bitrate calculator helps you find the right balance for your use case - whether you're encoding for streaming, archiving, or distribution.
How do I calculate bitrate from file size and duration?
Bitrate (Kbps) = (File Size in KB × 8) ÷ Duration in seconds. Our bitrate calculator does this automatically - enter the file size and duration, and it instantly shows the total bitrate in Kbps and Mbps.
How do I calculate file size from bitrate and duration?
File Size (MB) = (Bitrate in Kbps × Duration in seconds) ÷ 8 ÷ 1024. Switch to "Estimate File Size" mode in our bitrate calculator, enter your target bitrate and duration, and the tool shows the estimated file size in MB and GB.
Is my data safe when using this bitrate calculator?
Yes. All calculations happen locally in your browser using JavaScript. No file data or personal information is sent to any server, ensuring complete privacy every time you use our bitrate calculator online.
Is this bitrate calculator completely free to use?
Yes! Our bitrate calculator is 100% free with no signup, no account, and no usage limits. Calculate bitrates and file sizes for any video or audio project directly in your browser.
What bitrate should I use for streaming video?
For 1080p streaming, 4-8 Mbps is typical for H.264 and 2-4 Mbps for H.265/HEVC. For 4K, 15-25 Mbps is common for H.264 and 8-12 Mbps for H.265. Our bitrate calculator includes a reference table with recommended bitrates for common resolutions and codecs.
What is the difference between video bitrate and audio bitrate?
Video bitrate controls the quality of the video stream and is typically 1-25 Mbps. Audio bitrate controls the quality of the audio stream and is typically 128-320 Kbps. The total file bitrate is the sum of both. Our bitrate calculator computes the total combined bitrate from the file size.
Can I calculate bitrate for audio-only files?
Yes. Our bitrate calculator works for any media file - video, audio, or combined. For audio-only files like MP3, AAC, or FLAC, enter the file size and duration to get the audio bitrate in Kbps.