Electronics calculator
What Memory Card Size Do I Need?
Enter recording bitrate, recording duration hours, and capacity reserve to work out memory-card capacity.
Enter your measurements
What Memory Card Size Do I Need? Start with recording bitrate, recording duration hours, and capacity reserve. This minimum-capacity calculation turns those measurements into memory-card capacity, so you can compare real products or available space before making a decision.
- Recording bitrate — Required
- Recording duration hours — Required
- Capacity reserve — Required
Memory-card capacity
Enter the measurements above to calculate memory-card capacity.
How the calculation works
V17 calculation: requiredCapacityGB=bitrate×recordingHours×3600/8/1000×(1+reserve). The result is reported as Memory-card capacity.
Worked example
Example: Recording bitrate = 50 Mb/s; Recording duration hours = 4 h; Capacity reserve = 15%. Result: Required Capacity GB = 103.5 GB.
Before you decide
Use the finished, usable dimensions after trim, handles, skirting, packaging or other projections where relevant. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what memory card size do i need, the limiting result on this page is memory-card capacity.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Memory Card Size calculator tell me?
It returns memory-card capacity from the measurements entered on this page. The calculation is specific to memory card size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for memory card size?
Measure recording bitrate, recording duration hours, capacity reserve. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the memory-card capacity?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned memory-card capacity while allowing for the clearances, tolerances or ratings shown by its manufacturer.