Gravação SD UHS-3
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The UHS-3 SD Card Recording Time Calculator helps estimate how long you can record on an UHS-3 SD memory card, given the file size in bytes and the bitrate per second. This is particularly useful for photographers and videomakers who need to plan their recording sessions and ensure they have enough space to store all content.
The formula used is straightforward: we divide the file size in bytes by the bitrate per second, considering that 1 byte equals 8 bits. The result is the recording time in seconds, which can be converted to minutes or hours for better understanding. Note that recording speed also depends on device capability and SD card performance.
When to use this calculator? Mainly when planning high-quality recordings, such as 4K videos, or in situations where storage space is limited. It's a practical tool to avoid running out of space on the SD card during an important recording session.
A common precaution when using SD cards is to verify if the device you're using supports UHS-3 speed. Additionally, it's always recommended to have backup cards, as unexpected issues can occur. The calculator does not account for factors like file system efficiency or metadata space.
Frequently asked questions
What does UHS-3 mean and why is it important?
UHS-3 is a speed class for SD cards, indicating that the card supports transfer rates of up to 624 MB/s. It's important because it ensures the card can handle high-speed recording demands, such as 4K video.
How does bitrate affect recording time?
The higher the bitrate, the more data is recorded per second. This means that for a given file size, a higher bitrate will result in a shorter recording time.
Can I use this calculator for SD cards of other speeds?
The calculator is specific to UHS-3 cards, but you can adapt it for other speeds by adjusting the transfer rate accordingly. However, results will be less accurate if the actual card speed differs significantly from the one considered.
Does the calculator consider the SD card's file system?
No, the calculator does not account for file system efficiency or metadata space. It provides an estimate based solely on file size and bitrate.