Image File Size
Formula: Width × Height × Colour Depth
Quick Check: Images
Width: 5 | Height: 5 | Depth: 2 bits
Width: 10 | Height: 2 | Depth: 4 bits
Width: 20 | Height: 10 | Depth: 1 bit
Width: 100 | Height: 10 | Depth: 8 bits
Sound File Size
Formula: Sample Rate × Bit Depth × Duration
Quick Check: Sound
Rate: 10 Hz | Depth: 4 bits | Time: 2s
Rate: 100 Hz | Depth: 1 bit | Time: 5s
Rate: 20 Hz | Depth: 10 bits | Time: 3s
Rate: 50 Hz | Depth: 2 bits | Time: 10s
The Unit Rules
How to make the numbers smaller.
Rule 1: Bits to Bytes
Divide bits by 8 to get Bytes.
Rule 2: Bytes to KB
Divide Bytes by 1000 to get Kilobytes (KB).
Rule 3: KB to MB
Divide KB by 1000 to get Megabytes (MB).
Rule 4: MB to GB
Divide MB by 1000 to get Gigabytes (GB).
Try the Converter
Text File Size
Formula: Number of Characters × Bits per Character
Standard (ASCII)
English letters, numbers, symbols.
Advanced (Unicode)
Emojis, different languages (Chinese, Arabic).
Quick Check: Text
A file contains the text: "HELLO". (5 characters).
Tip: Use standard ASCII (1 byte per char).
Storage Capacity
Question: "How many files fit on the device?"
The Trap!
You cannot divide GB by MB directly.
Solution: Convert the Storage Device into the smaller unit first.
Step 2: 1000 MB ÷ File Size
Step 1: Convert GB to MB
4 × 1000 = 4000 MB
Step 2: Divide by File Size
4000 ÷ 2
2000 Files
Mental Math Challenge
10 Questions. Mixed Topics. No Calculators.
Challenge Complete!
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