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Camera Recording Time & SD Card Capacity Calculator Audio, Video & Photography
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Camera Recording Time & SD Card Capacity Calculator

Calculate exact video recording time (hours and minutes) and storage capacity across professional codecs (Apple ProRes, Sony XAVC, Canon Cinema RAW, BRAW, H.264/H.265) for SD, CFexpress, and SSD storage.

Storage Card & Codec Settings

Total Usable Recording Time V30 SD CARD COMPATIBLE
1h 40m
100.4 Minutes total recording time on 128 GB card
Data Ingest Rate
19.04 MB/s
~68.5 GB / hour recorded
Minimum Card Speed Rating
Class V30 (UHS-I)
Requires ≥ 30 MB/s sustained write
Storage Formatting & Capacity Breakdown
Formatted Card Capacity: 119.2 GiB (exFAT / UDF)
Effective Buffered Storage: 113.2 GB (with 5% reserve)
Cards Needed for 4-Hour Shoot: 3 Cards (128 GB)
Buffer Overflow Drop Risk: Safe (Data rate is 63% of V30 limit)

Frequently Asked Questions

Why did my camera stop recording after 15 seconds with a "Card Speed Too Slow" error?

Consumer SD cards often advertise "peak read speed" (e.g. 170 MB/s or 200 MB/s) on the packaging, but their sustained write speed may dip below 20 MB/s. When the camera's internal RAM buffer fills up faster than the card can write, recording aborts to prevent data loss. Always buy cards with an official V60 or V90 video speed class logo for 4K video.

How many 128GB cards do I need for an 8-hour wedding or event shoot?

If shooting standard 4K 10-bit at 150 Mbps, each 128GB card holds approximately 1 hour and 40 minutes of footage. An 8-hour day with 5 hours of total camera rolling time requires at least three 128GB cards (or two 256GB cards) plus one spare.