Free Tools

Data / Number / Computer Science Tools

Convert number bases, calculate bitwise operations and data storage units, and use everyday calculators - percentage, modulo, and more.

19 tools in this category

All Categories

SSL Tools 3 DNS Tools 12 Domain Tools 12 Website Tools 19 Security Tools 10 Email Tools 8 Performance Tools 10 SEO Tools 12 API & Developer Testing Tools 17 Git & GitHub Tools 18 DevOps Tools 16 Linux & System Administration Tools 17 Database & SQL Tools 20 AWS & Cloud Tools 16 Kubernetes Tools 14 Programming Language Tools 23 Frontend / CSS Tools 20 Image / SVG Developer Tools 18 Security & Authentication Tools 14 File & Data Conversion Tools 20 Data / Number / Computer Science Tools 19 Software Version / Package Tools 9 Developer Documentation / Project Tools 11 Byte Array Tools 17 Text & Writing Tools 28 Finance & Loan Calculators 20 PDF Tools 16 Image Editing Tools 12

Binary Calculator

Perform addition, subtraction, multiplication, and division directly on binary numbers, wi...

Use Tool

Binary to Decimal Converter

Convert a binary number to its exact decimal value, with the place-value calculation shown...

Use Tool

Decimal to Binary Converter

Convert a decimal number to its exact binary representation, with the conversion steps sho...

Use Tool

Hex to Decimal Converter

Convert a hexadecimal number to its exact decimal value, handling arbitrarily large hex nu...

Use Tool

Decimal to Hex Converter

Convert a decimal number to its exact hexadecimal value, handling arbitrarily large intege...

Use Tool

Octal Converter

Convert between octal and decimal (and binary/hex) - exact conversion for arbitrarily larg...

Use Tool

Number Base Converter

Convert a number between any two bases from 2 to 36 - binary, octal, decimal, hex, or any...

Use Tool

Bitwise AND/OR/XOR Calculator

Calculate bitwise AND, OR, XOR, and NOT on two numbers - shows binary and decimal results,...

Use Tool

Bit Shift Calculator

Calculate left and right bit shifts - clearly distinguishes arithmetic (sign-preserving) f...

Use Tool

Byte Converter

Convert between bits, bytes, KB, MB, GB, TB, and PB - decimal (1000-based) and binary (102...

Use Tool

Bits to Bytes Converter

Convert bits to bytes (and back) - the fundamental 8-bits-per-byte conversion, with common...

Use Tool

KB/MB/GB/TB Converter

Convert between KB, MB, GB, and TB - decimal and binary conventions clearly separated, wit...

Use Tool

Download Time Calculator

Estimate download time from file size and connection speed - handles bits/bytes units corr...

Use Tool

Storage Calculator

Calculate total storage needed for a quantity of items at a given size each - e.g. how muc...

Use Tool

File Size Calculator

Estimate raw file size from parameters - image dimensions and color depth, or audio/video...

Use Tool

Percentage Calculator

Calculate percentages - X% of Y, percentage increase/decrease, percentage difference, and...

Use Tool

Modulo Calculator

Calculate the remainder of a division - clearly explains how negative operands are handled...

Use Tool

Scientific Notation Converter

Convert between standard decimal numbers and scientific notation - handles very large and...

Use Tool

Roman Numeral Converter

Convert between Roman numerals and decimal numbers - validates malformed Roman numerals ra...

Use Tool

Number Systems and Bits

Programmers switch between number bases all the time - reading a hex colour, a binary flag or an octal permission. Convert between them with Binary to Decimal, Decimal to Binary, Hex to Decimal and Decimal to Hex, or use the Number Base Converter for any base. Work at the bit level with the Bitwise AND/OR/XOR Calculator and Bit Shift Calculator.

Data Sizes and Transfer Times

Storage sizes are confusing because "1 KB" can mean 1000 or 1024 bytes. The Byte Converter covers every unit from bits to petabytes, including binary KiB and MiB, while the KB/MB/GB/TB Converter lets you choose the convention explicitly. To plan downloads and uploads, use the Download Time Calculator, which accepts Mbps, Gbps, MB/s and GB/s.

Everyday Calculators

The Percentage Calculator answers the three common percentage questions, and the Modulo Calculator, Scientific Notation Converter and Roman Numeral Converter handle the rest. Numbers are processed in your browser.