How is video file size calculated?

Video file size is calculated using the formula: File Size = (Video Bitrate + Audio Bitrate) × Duration ÷ 8. The video bitrate depends on resolution, frame rate, and codec. Our calculator uses industry-standard bitrate estimates for accurate results.

Why does the same video look different in file size across codecs?

Different codecs use different compression algorithms. Newer codecs like H.265, VP9, and AV1 achieve much better compression than H.264 while maintaining similar quality. ProRes is designed for editing, not distribution, so it has very high bitrates for maximum quality.

What codec should I use for the smallest file size?

AV1 offers the best compression efficiency, producing the smallest files for the same visual quality. However, encoding AV1 is slower and not all devices support playback. H.265/HEVC is a good balance of compression and compatibility. H.264 has the widest compatibility but produces larger files.

How much storage do I need for 1 hour of 4K video?

It depends on the codec: approximately 15.8 GB with H.264, 6.8 GB with H.265/HEVC, 6.8 GB with VP9, 83.3 GB with ProRes, and 5.4 GB with AV1 at 30fps. Use our calculator to get precise estimates for any combination of settings.

Are the file size estimates exact?

The estimates are based on typical bitrates for each resolution, frame rate, and codec combination. Actual file sizes may vary depending on video content complexity, encoder settings, and variable bitrate encoding. Videos with lots of motion or detail may be larger, while static content may be smaller.

What is the difference between video bitrate and audio bitrate?

Video bitrate is the amount of data used per second to encode the visual content, typically measured in Mbps (megabits per second). Audio bitrate is the data rate for the sound track, usually 128-320 kbps. Video bitrate makes up the vast majority of a video's total file size.

Does frame rate affect file size?

Yes, higher frame rates increase file size because more frames need to be encoded per second. A 60fps video is roughly 1.5-2x larger than a 30fps video at the same resolution and codec, not exactly double because modern codecs compress temporal redundancy efficiently.

What resolution should I use for YouTube or social media?

1080p (1920×1080) is the standard for most social media platforms and provides a good balance of quality and file size. 4K (3840×2160) is recommended for YouTube if you want the highest quality. 720p works well for shorter clips or when bandwidth is limited.

How much storage do I need for a 1-hour 1080p recording?

A 1-hour 1080p video at 30fps requires approximately 3.6GB with H.264, 2.3GB with H.265/HEVC, 2.3GB with VP9, 26.5GB with ProRes, and 1.8GB with AV1. The exact size depends on your codec choice and bitrate settings.

What's the difference between H.264 and H.265 file sizes?

H.265 (HEVC) typically produces files 35-50% smaller than H.264 at similar visual quality. For example, a 10-minute 4K video at 30fps is approximately 2.6GB with H.264 but only 1.1GB with H.265. The trade-off is that H.265 encoding is slower and not supported on all older devices.

How do I calculate video file size manually?

The formula is: File Size (MB) = (Video Bitrate in Mbps + Audio Bitrate in Mbps) × Duration in seconds ÷ 8. For example, an 8 Mbps video with 0.128 Mbps audio for 300 seconds (5 minutes): (8 + 0.128) × 300 ÷ 8 = 304.8 MB. Our calculator does this automatically for any combination of settings.

Video File Size Calculator

Estimate video file sizes instantly. Calculate storage needs by resolution, bitrate, frame rate, codec, and duration.

Resolution

Frame Rate

Codec / Format

Duration

Hours

Minutes

Seconds

Bitrate Mode

Bitrate is automatically estimated based on your resolution, frame rate, and codec selection.

Estimated File Size

304.8 MB

1920×1080 · 30fps · H.264 (MP4)

Video Bitrate

8.0 Mbps

Audio Bitrate

128 kbps

Total Bitrate

8.1 Mbps

Quick Reference, File Size by Duration

Duration	File Size
1 min	61.0 MB
5 min	304.8 MB
10 min	609.6 MB
30 min	1.79 GB
1 hour	3.57 GB

Current Settings

Resolution1080p (1920×1080)

Frame Rate30 fps

Codec / FormatH.264 (MP4)

Bitrate ModeAuto

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Video File Sizes for Popular Platforms

Different platforms have different upload limits and recommended settings. Use our video file size calculator to plan your recordings for any platform.

YouTube Video Sizes

Plan your YouTube uploads with accurate file size estimates for every resolution.

1080p 10min: ~600MB (H.264) / ~375MB (H.265)
4K 10min: ~2.6GB (H.264) / ~1.1GB (H.265)
Max upload: 256GB or 12 hours
Recommended: H.264 MP4 for fastest processing

Instagram & TikTok Sizes

Estimate file sizes for short-form vertical video content on social platforms.

1080p 60s: ~60MB (H.264 at 8 Mbps)
1080p 90s: ~90MB (H.264 at 8 Mbps)
IG max: 4GB per video
TikTok max: 287MB mobile, 500MB desktop

Streaming & OTT Sizes

Calculate storage requirements for streaming workflows and video libraries.

720p 1hr: ~2.3GB (H.264) / ~1.4GB (H.265)
1080p 1hr: ~3.6GB (H.264) / ~2.3GB (H.265)
4K 1hr: ~15.8GB (H.264) / ~6.8GB (H.265)
Tip: Use H.265 or AV1 for 40-50% savings

WhatsApp & Discord Sizes

Check if your video will fit within messaging platform upload limits.

WhatsApp: 16MB limit (~20s at 1080p H.264)
Discord free: 25MB limit (~30s at 1080p H.264)
Discord Nitro: 500MB limit
Tip: Use our video compressor to fit within limits

ProRes & Editing Sizes

Plan storage for professional editing workflows with high-bitrate codecs.

1080p ProRes 1min: ~440MB
4K ProRes 1min: ~1.4GB
8K ProRes 1min: ~4.5GB
Tip: ProRes is 5-10x larger than H.264

Email Attachment Sizes

Estimate whether your video will fit as an email attachment.

Gmail: 25MB limit (~30s at 1080p H.264)
Outlook: 20MB limit (~25s at 1080p H.264)
Tip: Use 720p + H.265 for longer clips under 25MB
Alternative: Compress first, then attach

How to Calculate Video File Size

Estimate your video storage needs in three simple steps using our free video file size calculator. Instant results, no sign-up required.

Step 1

Choose Resolution & Frame Rate

Select your target resolution (720p to 8K) and frame rate (24 to 120 fps). Higher resolution and frame rate means larger file sizes.

Step 2

Select Codec & Duration

Pick a video codec (H.264, H.265, VP9, ProRes, or AV1) and enter your video duration. Modern codecs like H.265 and AV1 produce smaller files.

Step 3

View Estimated File Size

Get your estimated file size instantly along with a quick reference table showing sizes for common durations at your selected settings.

Why Use Our Free Video Size Calculator

Plan your video storage, estimate upload times, and compare codec efficiency with our instant video file size calculator.

Instant Calculations

Results update in real time as you adjust settings. Compare file sizes across resolutions, codecs, and durations instantly without any waiting.

5 Codecs Supported

Compare file sizes for H.264, H.265/HEVC, VP9, ProRes, and AV1. See exactly how much storage each codec requires for your video settings.

720p to 8K Support

Estimate file sizes for any resolution from 720p HD to 8K Ultra HD, plus custom resolutions. Perfect for planning storage needs for any project.

No Data Collected

All calculations happen in your browser. We don't collect any data, track your usage, or require any personal information to use the calculator.

Works on Any Device

Use our video bitrate calculator on any device with a web browser. No software download or installation required. Works on desktop and mobile.

Industry-Standard Estimates

Bitrate estimates are based on industry-standard encoding practices. Switch to manual mode for exact bitrate control when you need precise calculations.

Comparison

Vibrantsnap vs Other Video Size Calculators

See how our free video file size calculator compares to other popular tools for estimating video storage.

Feature

VibrantsnapToolstudOmnicalculatorCalcTool

Codecs supported

5 (H.264, H.265, VP9, ProRes, AV1)

Resolution presets

6 (720p to 8K + Custom)

Frame rate options

5 (24-120 fps)

Custom only

Limited

Auto bitrate estimation

Duration reference table

No sign-up needed

Real-time results

Frequently asked questions

The questions people ask most before getting started.

How is video file size calculated?
Video file size is calculated using the formula: File Size = (Video Bitrate + Audio Bitrate) × Duration ÷ 8. The video bitrate depends on resolution, frame rate, and codec. Our calculator uses industry-standard bitrate estimates for accurate results.
Why does the same video look different in file size across codecs?
Different codecs use different compression algorithms. Newer codecs like H.265, VP9, and AV1 achieve much better compression than H.264 while maintaining similar quality. ProRes is designed for editing, not distribution, so it has very high bitrates for maximum quality.
What codec should I use for the smallest file size?
AV1 offers the best compression efficiency, producing the smallest files for the same visual quality. However, encoding AV1 is slower and not all devices support playback. H.265/HEVC is a good balance of compression and compatibility. H.264 has the widest compatibility but produces larger files.
How much storage do I need for 1 hour of 4K video?
It depends on the codec: approximately 15.8 GB with H.264, 6.8 GB with H.265/HEVC, 6.8 GB with VP9, 83.3 GB with ProRes, and 5.4 GB with AV1 at 30fps. Use our calculator to get precise estimates for any combination of settings.
Are the file size estimates exact?
The estimates are based on typical bitrates for each resolution, frame rate, and codec combination. Actual file sizes may vary depending on video content complexity, encoder settings, and variable bitrate encoding. Videos with lots of motion or detail may be larger, while static content may be smaller.
What is the difference between video bitrate and audio bitrate?
Video bitrate is the amount of data used per second to encode the visual content, typically measured in Mbps (megabits per second). Audio bitrate is the data rate for the sound track, usually 128-320 kbps. Video bitrate makes up the vast majority of a video's total file size.
Does frame rate affect file size?
Yes, higher frame rates increase file size because more frames need to be encoded per second. A 60fps video is roughly 1.5-2x larger than a 30fps video at the same resolution and codec, not exactly double because modern codecs compress temporal redundancy efficiently.
What resolution should I use for YouTube or social media?
1080p (1920×1080) is the standard for most social media platforms and provides a good balance of quality and file size. 4K (3840×2160) is recommended for YouTube if you want the highest quality. 720p works well for shorter clips or when bandwidth is limited.
How much storage do I need for a 1-hour 1080p recording?
A 1-hour 1080p video at 30fps requires approximately 3.6GB with H.264, 2.3GB with H.265/HEVC, 2.3GB with VP9, 26.5GB with ProRes, and 1.8GB with AV1. The exact size depends on your codec choice and bitrate settings.
What's the difference between H.264 and H.265 file sizes?
H.265 (HEVC) typically produces files 35-50% smaller than H.264 at similar visual quality. For example, a 10-minute 4K video at 30fps is approximately 2.6GB with H.264 but only 1.1GB with H.265. The trade-off is that H.265 encoding is slower and not supported on all older devices.
How do I calculate video file size manually?
The formula is: File Size (MB) = (Video Bitrate in Mbps + Audio Bitrate in Mbps) × Duration in seconds ÷ 8. For example, an 8 Mbps video with 0.128 Mbps audio for 300 seconds (5 minutes): (8 + 0.128) × 300 ÷ 8 = 304.8 MB. Our calculator does this automatically for any combination of settings.

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