File size calculator for sound, images and text
Sound file size
882 kB
7,056,000 bits is 882,000 bytes.
- Bits
- 7,056,000
- Bytes
- 882,000
- Kilobytes
- 882 kB
Working
- File size = sample rate × bit depth × seconds = 44,100 × 16 × 10 = 7,056,000 bits.
- Divide by 8 for bytes: 7,056,000 ÷ 8 = 882,000 bytes.
- Divide by 1,000 for kilobytes: 882,000 ÷ 1,000 = 882 kB.
- Divide by 1,000 again for megabytes: 882 ÷ 1,000 = 0.882 MB.
Your result
882 kB. 7,056,000 bits is 882,000 bytes.
Practise file size questions
Your mock plan, in three taps
Sound file size = sample rate × bit depth × seconds: 10 seconds at 44,100 Hz and 16 bits is 7,056,000 bits, which is 882,000 bytes or 882 kB.
Questions people ask
What is the formula for sound file size?
Sample rate × bit depth × number of seconds gives the size in bits. 10 seconds at 44,100 Hz and 16 bits is 7,056,000 bits; divide by 8 for 882,000 bytes, which is 882 kB.
What is the formula for image file size?
Width × height × colour depth gives the size in bits. An 800 × 600 image at 24 bits per pixel is 11,520,000 bits, or 1,440,000 bytes (1.44 MB).
Should I divide by 1,000 or 1,024?
Both boards use 1,000: 1 kB is 1,000 bytes. OCR also accepts 1,024, so either earns the mark there, but show which one you used.
Why is a real file bigger than my answer?
Files also store metadata, such as an image's width, height and colour depth or a song's title, and stereo sound stores two channels. Compression can make files smaller instead.
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How we work this out
What it does
Work out the file size of a sound, a bitmap image or a text file with the GCSE formulas, from bits to megabytes.
Sound, bitmap image and text file sizes, using the formulas in the AQA and OCR specifications.
Method
- Sound: sample rate (Hz) × bit depth × length in seconds, in bits.
- Image: width × height in pixels × colour depth, in bits.
- Text: bits per character × number of characters.
- Divide by 8 for bytes, then by 1,000 for kilobytes and by 1,000 again for megabytes.