Dedicated pages for the most-used number workflows.
Number Calculators and Conversion Tools for Real Work
numbertools.io is built for students, developers, engineers, and analysts who need accurate results and clear explanations. Run calculations instantly, understand how each method works, and switch between specialized tools without losing context.
Basic arithmetic
Scientific functions
Complex number math
Base conversion
Bitwise operations
No account required and no backend delay for calculation results.
Clear error messages for format mistakes and unsupported values.
Each tool includes examples, method notes, and troubleshooting.
Basic Calculator
Add, subtract, multiply, divide, use percentages and powers, and evaluate grouped expressions quickly.
- Supports parentheses and operator precedence
- Handles negatives and common constants
- Designed for fast keyboard entry
Scientific Calculator
Compute trig, logarithms, roots, factorials, and mixed function expressions in a single line.
- Radian-based trigonometry
- Supports nested function calls
- Great for classwork and technical checks
Complex Calculator
Work with values like 3+4i, then inspect magnitude and argument immediately.
- Add, subtract, multiply, divide
- Formatted a ± bi output
- Polar hints for engineering contexts
Base Converter
Convert between binary, octal, decimal, and hex with strict validation and grouped binary output.
- All target bases shown together
- Readable 4-bit grouping
- Useful for debugging and electronics
Bitwise Calculator
Run AND, OR, XOR, NOT, and shift operations while viewing two’s complement and set-bit count.
- 8/16/32/64-bit representation view
- Integer-focused behavior
- Great for systems and low-level coding
One toolbox for quick checks and deeper understanding
Most online calculators either prioritize speed with no explanation, or long tutorials without usable tools. numbertools.io combines both. You can validate a result in seconds, then understand the method when you need to explain or troubleshoot it.
The interface keeps input and output close together, so you spend less time switching tabs and retyping values. Every tool includes practical examples and common error notes to reduce repeated mistakes.
Suggested workflow
- Choose the tool that matches your data type and operation.
- Enter values exactly in the documented format.
- Run calculation or conversion and copy output if needed.
- Use the built-in examples to verify edge cases.
- Open the Learn page for concept-level explanations.
If you work across multiple number systems, keep the Base Converter and Bitwise tool side by side for faster debugging.
Explore the full toolset
Start with quick calculations, then move into conversions and bitwise workflows for deeper technical tasks.