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Measure exactly how much your video files shrink with our free online video compression ratio calculator. Enter the original and compressed file sizes to get the compression ratio, space saved, and percentage reduction — essential for video encoding, streaming optimization, and storage planning.
Calculate NowInteractive Video Compression Ratio Calculator
Compression Results
How the Video Compression Ratio Calculator Works
Four simple steps to measure your encoding efficiency
Enter the Original Size
Type the file size of your source video — the uncompressed master, camera original, or pre-encode file — and pick the right unit (MB, GB, or TB). This is your baseline for the video compression ratio calculation.
Enter the Compressed Size
Type the file size after encoding with your chosen video codec, such as H.264, H.265/HEVC, VP9, or AV1, and select its unit. The calculator normalizes both values to a common unit automatically.
Get the Compression Ratio
Hit Calculate to see the compression ratio expressed as X:1, the absolute space saved, and what percentage of the original file remains. Higher ratios mean more aggressive compression.
Optimize Your Workflow
Use the result to compare codecs, pick streaming bitrates, estimate storage needs, or verify that your encoder settings deliver the file-size reduction you expect without visible quality loss.
Video Compression Ratio Formulas Explained
The math behind video file size reduction
Compression Ratio Formula
The compression ratio compares the original data size to the compressed data size. It is the single most common way to express how effective a video codec or encoder setting is.
The result is written as X:1. A 10:1 ratio means the compressed file is one-tenth the size of the original. For example, a 4.5 GB master compressed to 450 MB gives 4500 ÷ 450 = 10:1.
Space Saved Formula
This tells you the absolute storage or bandwidth savings in your chosen unit — the number that matters when sizing hard drives, CDN budgets, or upload quotas.
Percentage Reduction Formula
A 10:1 compression ratio equals a 90% reduction. This percentage view is useful when reporting encoding efficiency to clients or comparing presets in tools like HandBrake, FFmpeg, or Adobe Media Encoder.
Bitrate and File Size Relationship
Because video file size is determined by bitrate (bits per second) times duration, the compression ratio is directly tied to your bitrate choice. Halving the bitrate roughly doubles the compression ratio for the same source — which is why two-pass and constant-quality (CRF) encoding modes exist to balance ratio against visual quality.
Learn more: The fundamentals of lossy video coding are covered in depth on Wikipedia's video compression article, including how modern codecs exploit temporal and spatial redundancy.
Typical Compression Ratios by Codec
What to expect from common video encoders
| Codec | Typical Ratio (HD Video) | Best For |
|---|---|---|
| H.264 / AVC | 20:1 – 50:1 | Maximum compatibility, Blu-ray, web video |
| H.265 / HEVC | 40:1 – 100:1 | 4K streaming, ~50% smaller than H.264 at equal quality |
| VP9 | 35:1 – 80:1 | YouTube, royalty-free web streaming |
| AV1 | 50:1 – 120:1 | Next-gen streaming, ~30% better than H.265 |
| ProRes 422 | 4:1 – 7:1 | Professional editing mezzanine, near-lossless |
| Uncompressed / RAW | 1:1 | Camera masters, archival, VFX plates |
Compression Ratios by Use Case
Realistic targets for common delivery scenarios
| Use Case | Example | Realistic Ratio |
|---|---|---|
| Social media upload (1080p) | 500 MB master → 25 MB | 20:1 |
| YouTube 4K upload | 20 GB master → 2 GB | 10:1 |
| Streaming mezzanine (H.265) | 50 GB ProRes → 1 GB | 50:1 |
| Video conference recording | 2 GB raw → 100 MB | 20:1 |
| Archival (FFV1 lossless) | 100 GB → 50 GB | 2:1 |
Key Video Compression Terms
Vocabulary that makes compression ratios easier to interpret
| Term | What It Means | Why It Matters for Ratios |
|---|---|---|
| Bitrate | Data per second of video, usually Mbps | Lower bitrate = higher compression ratio for the same duration |
| CRF (Constant Rate Factor) | Quality-based encoding mode in x264/x265 | Higher CRF values produce higher ratios with more quality loss |
| GOP (Group of Pictures) | Frames between full keyframes | Longer GOPs raise ratios but hurt seeking and editing |
| Chroma subsampling | Reducing color resolution (4:2:0, 4:2:2) | 4:2:0 halves color data vs 4:4:4, boosting the ratio |
| Mezzanine codec | Intermediate editing format (ProRes, DNxHR) | Low ratios (4:1–7:1) by design to survive re-encoding |
Video Compression Ratio FAQs
Common questions about measuring video compression
It depends on the codec and purpose. For H.264 web delivery, 20:1 to 50:1 is typical at good quality. H.265/HEVC and AV1 can reach 50:1 to 120:1 while looking the same. Ratios above 100:1 with H.264 usually show visible artifacts. For editing and archival, much lower ratios (2:1 to 7:1) are preferred to preserve quality.
Divide the source bitrate by the encoded bitrate. If your camera records at 100 Mbps and you encode a streaming file at 5 Mbps, the compression ratio is 100 ÷ 5 = 20:1. Duration cancels out because both files represent the same running time.
Not necessarily — codec efficiency matters enormously. A 50:1 AV1 encode can look better than a 20:1 MPEG-2 encode of the same source. Within the same codec, though, a higher ratio at the same resolution means more discarded detail and a higher risk of artifacts.
Lossless codecs (FFV1, ProRes RAW, ZIP) preserve every pixel and typically achieve only 2:1 to 4:1 on video. Lossy codecs (H.264, H.265, AV1) discard psychovisually redundant information and reach 20:1 to 120:1. Choose lossless for masters and archival, lossy for delivery.
Higher resolutions often compress more efficiently in relative terms because large smooth areas (skies, walls) contain lots of redundancy. A 4K file at the same per-pixel quality setting may show a higher ratio than its 1080p version, even though the absolute file is larger.
Yes — the math is identical. Enter the original WAV/FLAC size and the compressed MP3/AAC/Opus size to get the audio compression ratio. A 50 MB WAV to a 5 MB MP3 is a 10:1 ratio, for example.
Common causes: a bitrate set too high for the resolution, constant-quality (CRF) mode reacting to noisy or high-motion footage, or encoding an already-compressed source (generation loss forces the encoder to spend bits on artifacts). Check your bitrate, preset, and source quality.
Understanding Video Compression in Practice
Video compression is the reason modern streaming exists. A single minute of uncompressed 1080p video at 30 frames per second requires roughly 9 GB of storage — completely impractical for the web. Through a combination of intra-frame compression (reducing redundancy within each frame, similar to JPEG) and inter-frame compression (storing only the differences between frames), modern codecs shrink that minute to 10–60 MB with little visible difference.
The compression ratio you measure with this calculator reflects three things working together: the codec's efficiency (AV1 squeezes more quality per bit than H.264), the encoder settings (bitrate, preset, CRF value), and the content complexity (a static interview compresses far better than confetti falling in slow motion). That is why the same settings can produce a 15:1 ratio on one clip and 60:1 on another.
When planning a project, work backwards from delivery. If your streaming platform recommends 8 Mbps for 1080p and your video is 10 minutes long, the expected file is about 600 MB. If your camera master is 12 GB, you are targeting roughly a 20:1 compression ratio — comfortably within H.264's transparent range. This kind of sanity check, done with the calculator above, prevents both bloated uploads and over-compressed mush.
For archival and professional editing, resist the urge to maximize the ratio. Mezzanine codecs like ProRes 422 and DNxHR intentionally sit at modest 4:1 to 7:1 ratios because every re-encode of a lossy file degrades quality further (generation loss). Keep masters large, deliver small, and use the ratio as your quality-control metric between the two.