Camera Memory Card Capacity Calculator

Shoot preset:

Choose a common camera job, then adjust the values to match your shoot.

Card size:

Enter the labeled size for one card, such as 64, 128, 256, or 512 GB.

GB/card

Cards packed:

Total physical cards available for the shoot; dual backup mode pairs cards by slot.

cards

Recording mode:

Choose how the camera uses cards: one slot, overflow pool, or mirrored backup slots.

Still photos:

Use expected shutter count, delivered coverage count, or a conservative event estimate.

photos

Photo size source:

Measured file size is best when you have sample files from the same camera settings.

Camera resolution:

Enter the sensor output megapixels after crop mode, for example 24, 33, 45, or 61 MP.

Photo format:

Use the setting you expect to shoot most of the event with.

Average photo file:

Use the average size of real images from the camera settings you will use.

MB/photo

Video runtime:

Enter recorded minutes, not event duration; set to 0 for stills-only planning.

min

Video recording profile:

Use the camera menu bitrate when available; presets are conservative planning shortcuts.

Video bitrate:

Common mirrorless values range from 50 Mb/s H.264 to 735+ Mb/s ProRes.

Mb/s

Selected card speed:

Use the printed V-rating, U-rating, or verified sustained write speed class.

Spare card reserve: {{ reserve_pct }}%

A 10-20% reserve keeps the last card from running completely full.

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Card capacity basis:

Decimal GB follows card labels; binary GiB follows 1024-based computer readouts.

Burst rate:

Enter frames per second for the fastest sustained burst you expect to use.

fps

Longest burst:

Set to 0 if burst shooting is not relevant to this shoot.

Burst recovery target:

Shorter recovery targets require faster cards; 30 seconds is a conservative field baseline.

Camera memory card capacity plan
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Camera shoot storage mix
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Alternative camera memory card scenarios
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Camera memory card speed check
Check	Value	Next action	Copy
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Memory-card planning is a capacity and sustained-write problem, not just a question of buying the largest card available. A shoot can combine thousands of stills, high-bitrate video, dual-slot recording, reserve capacity, and burst recovery requirements. Those demands compete for the same card pool, and the usable capacity may differ depending on whether capacity is treated as decimal gigabytes or binary gibibytes.

Photographers and video teams usually plan around two risks. The first is running out of storage before media can be backed up or swapped. The second is choosing a card that has enough nominal space but cannot sustain the write speed required by the selected video profile or burst workflow. A useful planner needs to estimate total data volume and then test whether the selected speed class is appropriate for the heaviest write load.

This calculation supports hybrid event coverage, interviews, sports bursts, travel shooting, documentary days, and production kits where card count and card class have to be decided before the job. It is especially helpful when a team is moving between JPEG, RAW, RAW plus JPEG, 4K, 8K, ProRes, or high-frame-rate capture and needs a transparent estimate instead of relying on camera-menu remaining-time guesses alone.

What It Answers:

How much card capacity is needed for stills, video, and reserve space.
How dual-slot backup recording changes the physical card count needed.
Whether the selected card speed class can support video bitrate and burst clearing.
How many extra cards are required when the packed kit falls short.

Input Model:

The still-photo estimate can come from a measured average file size or from a megapixel-based format estimate. Measured averages are preferred when a camera body, compression setting, and subject matter are already known. Format estimates are useful for early planning because JPEG, compressed RAW, lossless RAW, and RAW plus JPEG have different size behavior.

Video capacity is based on runtime and bitrate. A 150 Mb/s video profile uses much less storage than a 735 Mb/s intraframe or ProRes profile, even if both are described as 4K. Recording mode then determines how the capacity pool is counted. Single-slot and overflow workflows can use the combined card pool, while mirrored dual-slot recording requires a complete copy on both slots and therefore increases the physical card count.

Planning factor	Effect	Common risk
Still format	Changes average MB per frame.	RAW plus JPEG can double-count unexpectedly.
Video bitrate	Turns runtime into sustained storage demand.	High-bitrate profiles fill cards faster than resolution labels suggest.
Reserve	Adds buffer above expected shoot volume.	No margin for overruns, retakes, or delayed backup.
Write speed	Tests the selected card class against workload load.	Enough space but dropped frames or slow burst clearing.

Interpreting the Results:

The capacity result should be read as the minimum working kit for the assumptions entered. If the card margin is small, add more capacity or reduce risk by shortening offload intervals. For weddings, live events, travel, and commercial shoots, a small calculated surplus may still be too tight because schedule changes, duplicate takes, and client requests can add media quickly.

The speed check is separate from the capacity check. A kit can have enough gigabytes while still failing the required sustained write speed. When the required write speed is close to the selected card's minimum rating, choose a higher class or use manufacturer-verified cards for the camera body and codec. The model includes a headroom factor for video and a burst-recovery estimate, but camera buffer behavior and thermal limits still depend on the actual body and firmware.

Technical Details:

Total media demand is the sum of still-photo storage and video storage, then reserve is added. Card capacity can be interpreted in decimal GB or binary GiB depending on the planning basis. For mirrored dual-slot recording, the same media demand must fit in each slot, so physical card count is based on card pairs.

still_MB = photo_count x average_photo_MB

video_MB = \frac{bitrate_Mb_per_s}{8} x 60 x video_minutes

required_MB = (still_MB + video_MB) x (1 + reserve_rate)

required_write_MB_per_s = \max (\frac{bitrate_Mb_per_s}{8} x 1.2, \frac{burst_fps x burst_seconds x average_photo_MB}{clear_seconds})

Practical Checks:

Use a measured photo average after a short test shoot when the camera and compression settings are known.
Plan separate card pools for critical backups, handoff cards, and media that cannot be formatted until delivery is confirmed.
Confirm card speed compatibility against the camera maker's tested media list for demanding video codecs.
Keep reserve higher for event work, travel days, wildlife, sports, and any job where offloading during the shoot is uncertain.