Online Calculator
A free, fast, and easy-to-use online basic calculator.
What is the Online Calculator?
The Standard Calculator works like a classic handheld or OS calculator: addition, subtraction, multiplication, division, percentages and sign toggling, with large buttons that are easy to tap on a phone.
Unlike a scientific calculator, this tool is intentionally focused on everyday arithmetic. The running display makes it useful for checking a shopping total, dividing a bill, finding a percentage, or doing quick office calculations without navigating through advanced functions.
All math runs directly in your browser and keeps working offline once the page has loaded. No calculation history or entered value is sent to ToolSink, which also makes it suitable for figures that you would rather not paste into a search engine.
How to use the Online Calculator
- 1Click or tap the numbers to input your values.
- 2Use the +, -, × and ÷ buttons for arithmetic operations.
- 3Press = to calculate the result, or AC to clear.
When to use the Online Calculator
- Add item prices and apply a percentage while comparing a shopping basket or sale offer.
- Split a restaurant bill or shared household expense into equal portions.
- Check basic arithmetic in homework, invoices, estimates or handwritten notes.
- Run quick calculations on a phone when a physical calculator is not nearby.
Key features
- Instant results as you type
- Percentage and sign-toggle keys
- Large, touch-friendly buttons
- Works offline in your browser
Frequently asked questions
Does it work offline?
Yes — once the page loads, the calculator functions entirely in your browser.
How does the percentage key work?
Enter the relevant amount and percentage as you would on a standard calculator. For an unambiguous percent-of calculation, multiply the amount by the percentage and divide by 100.
Does the calculator save my previous calculations?
No. It is designed for one current calculation and does not create a cloud history. Copy any result you need before clearing or closing the page.
Can it perform scientific functions?
No. It covers standard arithmetic, percentages and sign changes, but not trigonometry, logarithms, powers or graphing.
All Finance Calculators
Tap any tool to jump straight in — no signup, works on mobile.