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We’re refreshing the questions on our KS3 and GCSE Computer Science subject knowledge assessment. The current version remains available. Updated questions will be available from 18 May 2026.

GCSE

Lesson 11 Bitmap file size calculation

Curriculum > KS4 > Unit > Lesson

First, learners will recap their understanding of bitmap images. They will then discover how to calculate the file size of a bitmap image using different examples. Then, they will investigate how the number of pixels and colour depth can affect the file size of an image.

Learning objectives

  • Calculate the file size of bitmaps
  • Describe how the number of pixels and colour depth can affect the file size of a bitmap image, using examples

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