How much storage space does H.265 (HEVC) save compared to H.264?

H.265 provides approximately 40% to 50% better compression efficiency over H.264. To achieve identical visual quality, an H.265 stream requires roughly half the bitrate of H.264, cutting storage demands in half.

Why does Apple ProRes require so much more storage than MP4/H.264?

ProRes is an 'All-Intra' compression codec that saves every frame independently without inter-frame temporal compression (IPB). While it uses much higher bitrates, it requires virtually zero CPU/GPU overhead to decode, enabling buttery smooth real-time scrubbing and complex color grading in NLEs.

Why does my 128GB SD card only show 119GB on my Windows computer?

Card manufacturers use decimal units (1 GB = 10⁹ bytes), while computer operating systems calculate in binary units (1 GiB = 2³⁰ bytes). Dividing 128,000,000,000 by 1,073,741,824 yields 119.2 GiB. This discrepancy is normal across all storage devices.

What minimum SD card speed class is needed for 4K 60fps video?

For typical consumer 100-150Mbps streams, a U3 / V30 UHS-I card is adequate. For professional All-Intra modes (240Mbps to 600Mbps), you must use a UHS-II V60 or V90 card, or CFexpress media.

Does audio track bitrate noticeably affect total video storage?

In general, standard stereo audio (320kbps AAC or 1.5Mbps uncompressed PCM) represents less than 1% of the overall video file size. However, multi-channel 24-bit 96kHz setups with 8+ tracks can contribute 5 to 10GB per hour.

Video Bitrate & SD Card/SSD Storage Calculator

Calculate required SD card and SSD storage capacity (GB/TB), data write throughput, and recording hours across video codecs and bitrates.

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Video Bitrate & Storage Calculator

Calculate storage demands in GB/TB and required SD/SSD card counts

Standard Resolution & Codec Preset

Video Bitrate (Mbps)

Audio Bitrate (kbps)

Duration (Hrs / Mins)

Camera Count (Multicam)

Storage Requirements & Media Ingestion

Total Required Capacity

135.3 GB

Binary OS: 126.0 GiB

Hourly Ingestion Rate

67.6 GB

Per 60 minutes of video

Data Write Throughput

18.8 MB/s

150.3 Mbps

Recommended Card Speed Class & Media Allocation

Minimum Required Class: UHS-I U3 / V30 (min 30 MB/s write)

128GB SD2 cardsper camera

256GB SD1 cardsper camera

512GB SD/CFe1 cardsper camera

1TB SSD1 drivestotal fleet

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Video Bitrate & Storage Capacity (SD/SSD) Engineering Guide

Accurately projecting storage capacity requirements for SD cards, CFexpress cards, external SSDs, and NAS storage arrays is critical for video production, live broadcasting, and post-production archiving.

Actual video file sizes are not dictated strictly by resolution (1080p, 4K, 8K), but rather by data transmission rates expressed as 'Bitrate (Mbps or MB/s)', encoding compression standards (H.264/AVC, H.265/HEVC, Apple ProRes 422, ProRes RAW, AV1), frame rate (fps), and audio channel allocations.

This professional calculator provides real-world presets from YouTube web streaming to high-end cinema ProRes HQ and RAW pipelines, calculating total storage demands (GB/TB), hourly ingestion rates, and required memory card counts for multi-camera shoots.

Bitrate-to-Byte Conversion & Storage Sizing Mathematics

Exact formulas reconciling data transmission rates (bits per second) with binary OS storage formatting.

Storage Sizing FormulationsMathematical Formulation

Total Stream Bitrate (Mbps) = Video Bitrate (Mbps) + (Audio Bitrate [kbps] / 1,000) Data Write Throughput (MB/s) = Total Stream Bitrate / 8 Total Duration (Seconds) = (Hours × 3,600) + (Minutes × 60) + Seconds Nominal Storage (GB) = [Throughput (MB/s) × Duration (s) × Camera Count] / 1,000 Binary OS Capacity (GiB) = [Throughput × 1,000,000 × Duration × Cameras] / (1024³)

Flash memory manufacturers market drives in decimal gigabytes (1 GB = 10⁹ bytes), whereas host operating systems format filesystems in binary gibibytes (1 GiB = 2³⁰ bytes). A 5% to 10% safety margin should always be maintained.

4K 60fps ProRes 422 recording (approx. 440 Mbps bitrate) for 2 hours with 1 camera

Write Throughput Calculation440 Mbps / 855.0 MB/s

Hourly Ingestion Rate55.0 MB/s × 3,600 s198,000 MB (198 GB / hr)

2-Hour Baseline Demand198 GB × 2 hrs396 GB

Safe Media Allocation (+5% buffer)396 GB × 1.05approx. 416 GB

👉 A minimum of one 512GB high-speed CFexpress card or a 1TB external portable SSD (e.g., Samsung T7 Shield) is required.

Video Codec & Resolution Hourly Storage Consumption Table

Average bitrates and storage consumption for 1 hour of continuous recording per single camera

Resolution & Format	Video Codec	Frame Rate	Bitrate (Mbps)	Storage / Hour (GB)	Min. Card Speed Class
1080p FHD Web Streaming	H.264 (MP4)	30 fps	12 Mbps	5.4 GB / hr	Class 10 / U1 (10 MB/s)
1080p FHD Broadcast High	H.264 (All-I)	60 fps	50 Mbps	22.5 GB / hr	U3 / V30 (30 MB/s)
4K UHD Efficient Web	H.265 (HEVC)	30 fps	45 Mbps	20.3 GB / hr	U3 / V30 (30 MB/s)
4K UHD Mirrorless Standard	XAVC S / H.264	60 fps	150 Mbps	67.5 GB / hr	V60 (60 MB/s)
4K UHD Cinema All-Intra	H.265 (All-I)	60 fps	400 Mbps	180.0 GB / hr	V90 / CFexpress Type A
4K UHD Broadcast Standard	Apple ProRes 422	30 fps	503 Mbps	226.4 GB / hr	CFexpress / Fast SSD
4K UHD Cinema Mastering	Apple ProRes 422 HQ	60 fps	1,768 Mbps	795.6 GB / hr	CFexpress Type B NVMe
8K UHD Cinema RAW (Canon R5C/Red)	Cinema RAW Light	30 fps	2,600 Mbps	1,170.0 GB / hr	CFexpress Type B (2GB/s)

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How to Use

11. Select Resolution & Codec Preset

Choose resolution (1080p, 4K, 8K) and compression profile (H.264, H.265/HEVC, ProRes 422, ProRes HQ, RAW) or enter custom bitrate.

22. Set Frame Rate & Audio Parameters

Specify target frame rate (24, 30, 60, 120 fps) and audio stream bitrate (kbps) and channel count.

33. Input Recording Duration & Camera Count

Specify expected shooting time (hours, minutes) and number of simultaneous cameras in the multi-cam setup.

44. Review Ingestion Rates & Media Allocation

Analyze total storage requirements in GB and TB, hourly consumption rates, and recommended card allocations (128GB/256GB/512GB/1TB).

Production Ingestion Planning Scenarios

Media forecasting across YouTube, wedding, documentary, and action sports pipelines

YouTube Studio 4K Podcast (90 min)

Shooting Sony FX3 4K 24fps 100Mbps generates 67.5GB in 90 minutes; a single 128GB V30 SD card accommodates the entire shoot comfortably.

Wedding Ceremony 3-Camera Multicam (2 hr)

Recording 4K 60fps 150Mbps across 3 bodies requires 135GB per camera (405GB total), necessitating dedicated 256GB V60 cards for each operator.

Indie Documentary ProRes 422 Interview (4 hr)

BMPCC 4K capturing ProRes 422 (503Mbps) fills roughly 905GB over 4 hours, making direct-to-SSD USB-C recording (1TB/2TB) the standard workflow.

Action Sports 4K 120fps Slow-Motion (1 hr)

High frame rates push bitrates to 200Mbps, consuming 90GB per hour and requiring V60+ rated media to avoid frame buffer drops.

💡 Media Selection & Data Integrity Best Practices

✓ Distinguish Megabits (Mb) from Megabytes (MB)

Always divide camera bitrates (Mbps) by 8 to obtain actual write requirements in MB/s (e.g., 200 Mbps = 25 MB/s, well within a V30 card's 30 MB/s sustained rating).

✓ Look for Video Speed Class (V30, V60, V90)

Do not rely on advertised peak read speeds (e.g., 300 MB/s). Sustained minimum write speed guarantee (the 'V' rating) is what prevents buffer overruns.

✓ Maintain a 10% Unwritten Margin

Leaving 10% headroom preserves space for filesystem indexing tables and prevents catastrophic clip corruption when reaching full capacity.

⚠️ Common Pitfalls & Mistakes to Avoid

❌ Using UHS-I Cards for 400Mbps+ All-Intra Codecs

✅ UHS-I hardware buses top out at 104 MB/s theoretical; 400Mbps+ demands UHS-II V60/V90 or CFexpress media.

❌ Filling Cards to 100% Full Capacity

✅ Exhausting every last byte risks truncating the MP4/MOV header metadata, rendering the final take unreadable.

❌ Prematurely Ejecting Media Before Buffer Flushes

✅ Never open the battery or card door while the camera write indicator LED is flashing.

Frequently Asked Questions (FAQ)

Expert answers to the most frequently asked questions and edge cases.

6 Q&As

Camera bitrates are measured in megabits per second (lowercase 'b'), whereas SD card speeds are rated in megabytes per second (uppercase 'B'). Since 1 byte equals 8 bits, 100Mbps equates to only 12.5MB/s. A modest V30 card (30MB/s sustained write) easily handles a 100Mbps to 200Mbps video stream.

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