Online Calculator
A fast and simple calculator for everyday math
About the Online Calculator
The EngLab Online Calculator is a fast, reliable, and easy-to-use tool for performing basic arithmetic operations. It supports addition, subtraction, multiplication, division, percentages, and decimal calculations. Designed for students, professionals, and everyday users, this calculator offers a clean interface, instant results, and full keyboard support — all directly in your browser with no downloads or signup required.
What You Can Calculate
- Addition (+): Combine numbers quickly for totals and sums.
- Subtraction (−): Find differences between values with ease.
- Multiplication (×): Perform product calculations for math, finance, or everyday use.
- Division (÷): Divide numbers accurately with automatic error handling.
- Percentages (%): Calculate percent values for discounts, tax, increase, or decrease.
- Decimals: Work with precise decimal inputs for accurate results.
How the Calculator Works
This online calculator uses standard arithmetic rules to evaluate expressions:
- Addition: a + b
- Subtraction: a − b
- Multiplication: a × b
- Division: a ÷ b
- Percentage: a × (b ÷ 100)
How to Use the Calculator
- Enter numbers using the buttons or your keyboard.
- Select an arithmetic operator such as +, −, ×, or ÷.
- Press the = button or hit Enter to view the result.
- Use AC to reset all input or ⌫ to delete the last character.
Applications of an Online Calculator
This calculator is ideal for quick math tasks such as budgeting, homework, shopping calculations, percentage discounts, basic accounting, and general number crunching. Because it runs entirely in your browser, it works on any device — desktop, tablet, or mobile — and ensures that your calculations remain private and secure.