Measurement of the Size of Computer Memories
IECB System (Most Common Binary System)
| Memory Size Name | Number of Bytes | Equivalent in Denary |
|---|---|---|
| 1 kibibyte (1 KiB) | 2¹⁰ = 1,024 | 1,024 bytes |
| 1 mebibyte (1 MiB) | 2²⁰ = 1,048,576 | 1,048,576 bytes |
| 1 gibibyte (1 GiB) | 2³⁰ = 1,073,741,824 | 1,073,741,824 bytes |
| 1 tebibyte (1 TiB) | 2⁴⁰ = 1,099,511,627,776 | 1,099,511,627,776 bytes |
| 1 pebibyte (1 PiB) | 2⁵⁰ = 1,125,899,906,842,624 | 1,125,899,906,842,624 bytes |
Conventional System (Decimal-Based)
| Memory Size Name | Number of Bytes | Equivalent in Denary |
|---|---|---|
| 1 kilobyte (1 KB) | 10³ = 1,000 | 1,000 bytes |
| 1 megabyte (1 MB) | 10⁶ = 1,000,000 | 1,000,000 bytes |
| 1 gigabyte (1 GB) | 10⁹ = 1,000,000,000 | 1,000,000,000 bytes |
| 1 terabyte (1 TB) | 10¹² = 1,000,000,000,000 | 1,000,000,000,000 bytes |
| 1 petabyte (1 PB) | 10¹⁵ = 1,000,000,000,000,000 | 1,000,000,000,000,000 bytes |
Calculating File Size
For stereo, multiply the above by 2.
Sample Question
500 × 500 × 24 = 6,000,000 bits
6,000,000 ÷ 8 = 750,000 bytes
750,000 ÷ 1024 ≈ 732 KiB
500 × 500 × 3 = 750,000 bytes ≈ 732 KiB
Modified at 2025-08-11 07:24:25