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formula sheet for computer science, Cheat Sheet of Computer science

Computer science

This Computer Science Formula Sheet is made for students to revise important calculations, definitions, and concepts needed for exams. It includes number systems such as binary, decimal, octal, and hexadecimal conversions, data storage units, logic gates, Boolean logic, flowchart symbols, pseudocode basics, database terms, and network speed calculations. It also includes important binary addition rules and key computer components like CPU, RAM, ROM, ALU, and CU. This sheet is useful for quick revision, understanding technical concepts clearly, and preparing for theory and practical computer science exam questions.

Typology: Cheat Sheet

2025/2026

Available from 04/19/2026

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COMPUTER SCIENCE FORMULA SHEET
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
NUMBER SYSTEMS
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
Binary to Decimal
Multiply each binary digit by powers of 2
Example:
1011 = 8 + 0 + 2 + 1 = 11
Decimal to Binary
Repeated division by 2
Octal to Decimal
Multiply each digit by powers of 8
Hexadecimal to Decimal
Multiply each digit by powers of 16
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
DATA STORAGE
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
1 Nibble = 4 Bits
1 Byte = 8 Bits
1 Kilobyte (KB) = 1024 Bytes
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COMPUTER SCIENCE FORMULA SHEET

NUMBER SYSTEMS

Binary to Decimal Multiply each binary digit by powers of 2 Example: 1011 = 8 + 0 + 2 + 1 = 11 Decimal to Binary Repeated division by 2 Octal to Decimal Multiply each digit by powers of 8 Hexadecimal to Decimal Multiply each digit by powers of 16 โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” DATA STORAGE โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” 1 Nibble = 4 Bits 1 Byte = 8 Bits 1 Kilobyte (KB) = 1024 Bytes

1 Megabyte (MB) = 1024 KB 1 Gigabyte (GB) = 1024 MB 1 Terabyte (TB) = 1024 GB โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” LOGIC GATES โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” AND Gate Output = 1 only if both inputs are 1 OR Gate Output = 1 if at least one input is 1 NOT Gate Reverses the input NAND Gate NOT + AND NOR Gate NOT + OR XOR Gate Output = 1 if inputs are different โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”

PSEUDOCODE

Input INPUT name Output OUTPUT result Condition IF condition THEN Loop FOR / WHILE / REPEAT โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” BOOLEAN LOGIC โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” TRUE = 1 FALSE = 0 NOT A Reverses A A AND B True only if both are true

A OR B

True if one or both are true โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” IMPORTANT FORMULAS โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Binary Addition Rules 0 + 0 = 0 0 + 1 = 1 1 + 0 = 1 1 + 1 = 10 1 + 1 + 1 = 11 โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” IMPORTANT FACTS โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” CPU = Central Processing Unit RAM = Random Access Memory ROM = Read-Only Memory ALU = Arithmetic Logic Unit CU = Control Unit ICT = Information and Communication Technology