How Many Days Will a CCTV Memory Card Record?

A CCTV memory card does not provide a fixed number of recording days. Retention depends on usable capacity, the total recorded bitrate and how long recording runs each day. Before a dealer order, confirm both the camera’s supported card specification and the recording mode the customer actually needs.

A “128GB card” or an advertised megapixel figure alone cannot establish a retention promise. Use a calculation for initial planning, then ask the installer to check the selected configuration in operation.

Calculate storage from bitrate and recording hours

When the average recorded bitrate is known, use decimal units for a starting estimate:

GB per day = average recorded Mbps × recording hours per day × 3,600 ÷ 8 ÷ 1,000
Estimated days = usable recording capacity in GB ÷ GB per day

For continuous recording at a hypothetical 1 Mbps, the video payload is 10.8GB per day. If several streams are stored, use their combined recorded bitrate. Do not substitute the bitrate of a low-quality mobile preview for the stream saved to the card.

These are mathematical examples, not camera specifications or card recommendations. They assume a single constant-rate video stream running continuously and the full stated decimal capacity available for that payload. Formatting, reserved space, audio, recording-file overhead, additional streams and changing bitrate can alter actual retention. Verify the camera’s capacity limit before considering any card size in this table.

Axis’s bitrate-control white paper explains why variable bitrate can make storage requirements less predictable and why scene activity affects the data produced. It describes Axis technology; it does not establish the bitrate controls available in a LiveView camera.

Why event recording needs a different estimate

For a motion-triggered installation, do not assume recording runs for a fixed fraction of every day. Ask which events start clips, how long each clip lasts and whether pre-event or post-event footage is stored. A busy entrance and a quiet locked room need separate assumptions.

Request a representative observation period using the intended settings. Record the storage written, the recording hours or clip count and the activity seen during that period. Use it to refine the estimate, while allowing for busier days. A short quiet demonstration does not prove the retention that a busy site will achieve.

Also separate storage from power. A larger card does not establish that a solar or battery camera supports continuous recording under the site’s operating conditions. Our solar camera buying guide explains the model and installation questions to ask.

Choose a compatible card, not capacity alone

Before including a memory card in a camera quotation, request the exact supported card type, maximum capacity, required performance class and any model-specific preparation instructions. Ask whether the card is included with the camera or is a separate item.

Write endurance is a separate consideration from how much footage fits. For example, Kingston describes its High Endurance microSD range as intended for write-intensive surveillance recording. That does not mean every endurance card suits every camera or that LiveView supplies that particular range. Check the selected camera and card documentation together.

Ask the installer to demonstrate playback, confirm the date and time settings, and explain what the selected camera does when storage fills. Confirm any overwrite or retention setting on the actual model rather than assuming it is universal.

What to confirm for a LiveView enquiry

The LiveView 3 View Wi-Fi Camera listing advertises micro SD storage, while the LA100 AOV solar camera listing advertises TF-card support. These catalog descriptions do not establish a maximum supported capacity, measured bitrate or guaranteed recording duration.

Send the selected model link, target retention period, recording schedule, required audio and number of saved views when making a LiveView dealer enquiry. Ask the team to confirm the unresolved specifications before choosing the card. Browse the Wi-Fi camera range or solar surveillance range for model-specific listings.

Is memory-card storage the same as a SIM data allowance?

No. The card stores recordings; a mobile data allowance concerns traffic over the cellular connection. For planning remote viewing, use our separate 4G CCTV SIM-plan and data-usage guide.

Can I promise 30 days from the card size alone?

No. Establish the recording settings, usable capacity and expected activity, then validate the retention for the proposed system. If a required detail is unavailable, mark the estimate provisional.