Video
Video File Size & Bitrate Calculator
Comprehensive video calculator: estimate file sizes from bitrates, compute bitrates for upload file size targets, and calculate transfer times.
Calculate Video File Size from Bitrate & Duration
1214,4 MB
1,214 GB
0,001 TB
⚠️ Important Distinction: Mbps vs. MB/s (Bits vs. Bytes)
Internet service providers (ISPs) quote download and upload bandwidth in Megabits per second (Mbps with a lowercase ‘b’). However, browsers, game launchers (Steam, Epic), and operating systems report file sizes and download speeds in Megabytes per second (MB/s with a capital ‘B’).
For example, a 100 Mbps internet connection yields a theoretical maximum download speed of 12.5 MB/s (100 ÷ 8). With realistic 5%–10% TCP/IP protocol overhead, expect real transfer rates around 11.5 MB/s.
Bitrate Is a Budget — Spend It Where It Shows
For a fixed duration, file size is nothing more than bitrate × time. Every export decision is therefore an allocation problem: bits spent on fast motion and fine detail are visible; bits spent on a static conference-call background are not. Two exports at the same size can look dramatically different depending on where the encoder spent the budget.
Modern codecs change the numbers, not the principle. H.264 at 16,000 kbps and HEVC at 8,000 kbps can look equivalent — the calculator accepts whatever bitrate your workflow uses, and the platform-limit mode converts in the other direction: give it Discord's 25 MB ceiling and it returns the maximum bitrate that fits.
How the Estimate Is Built
- Combines video and audio bitrates, multiplies by duration, and converts bits to bytes.
- Solves reverse equations to determine maximum allowed bitrate for upload limits (Discord, email).
- Calculates download and upload durations across broadband speeds with protocol overhead factoring.
- Clearly differentiates telecommunication bandwidth (Mbps) from disk file size (MB/s).
Worked Example
Common Questions
What is the difference between Mbps and MB/s?
Mbps (Megabits per second) measures data transmission speed and network bandwidth. MB/s (Megabytes per second) measures file storage size. Because 8 bits equal 1 byte, 100 Mbps internet provides a maximum theoretical download speed of 12.5 MB/s.
How do modern codecs affect bitrate?
Modern codecs like HEVC (H.265) and AV1 deliver approximately 30% to 50% better compression efficiency than legacy H.264 at equivalent visual quality.
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