Large display calculator for easy calculations. Free, no download, works on all devices. Use your keyboard or click the buttons.
Calculate percentages quickly with these common operations.
Use your keyboard for faster calculations. All shortcuts work with the standard calculator mode.
The memory function allows you to store a value and use it later in calculations:
| Calculation | Button Sequence | Result |
|---|---|---|
| 25 + 17 | 2 → 5 → + → 1 → 7 → = | 42 |
| 100 - 35 | 1 → 0 → 0 → - → 3 → 5 → = | 65 |
| 12 × 8 | 1 → 2 → × → 8 → = | 96 |
| 144 ÷ 12 | 1 → 4 → 4 → ÷ → 1 → 2 → = | 12 |
| 15% of 200 | 2 → 0 → 0 → % → 1 → 5 → = | 30 |
Large, clear numbers that are easy to read. Perfect for users who prefer bigger text or have visual impairments.
Use on your phone, tablet, laptop, or desktop computer. Responsive design adapts to any screen size.
No hidden costs, no signup required, no downloads needed. Just open and calculate.
Get answers immediately. No waiting for page loads or processing. Results appear instantly.
Use your keyboard for faster calculations. All standard keys work intuitively.
Store values in memory for complex calculations with M+, M-, MR, and MC buttons.
Simply open the calculator in your web browser. Click the number buttons to enter values, use operation buttons (+, -, ×, ÷) for calculations, and press equals (=) to see results. Use Clear (C) to start a new calculation or the backspace button (←) to delete the last digit. You can also use your keyboard for faster input.
Yes! This full screen calculator is fully responsive and works perfectly on all devices including smartphones, tablets, laptops, and desktop computers. The large buttons are designed to be easy to tap on touchscreens, making it ideal for mobile use.
Yes, this calculator is completely free to use. There's no signup required, no download needed, and no hidden costs. You can use it as many times as you want for all your calculation needs - whether that's quick maths, checking receipts, or homework help.
This calculator performs basic arithmetic: addition (+), subtraction (-), multiplication (×), division (÷), and percentages (%). The power mode also includes squares (x²), cubes (x³), square roots (√), and custom powers (xⁿ). It also includes memory functions (M+, M-, MR, MC) to store values for later use.
Use the Percentage mode tab for easy percentage calculations. For "What is 15% of 200?", the answer is 30. For "30 is what % of 200?", the answer is 15%. You can also increase or decrease values by a percentage - for example, £100 increased by 20% equals £120.
Yes! You can use your keyboard for faster calculations. Number keys (0-9) for digits, +, -, *, / for operations, Enter or = for equals, Escape or C for clear, and Backspace to delete the last digit. This makes the calculator much faster for frequent users.
Memory functions let you store values for multi-step calculations: M+ adds the current display value to memory, M- subtracts from memory, MR recalls (shows) the stored value, and MC clears the memory back to zero. An "M" indicator shows when memory contains a value.
If the calculator isn't responding, try these steps: 1) Refresh the page using F5 or the refresh button. 2) Make sure JavaScript is enabled in your browser settings. 3) If you see "Error" in the display, press Clear (C) and try your calculation again. 4) Division by zero will show an error - this is mathematically undefined.
This full screen calculator is designed for users who need a simple, easy-to-use calculator with a large display. Whether you're checking your shopping receipt, helping with homework, or performing quick calculations at work, this calculator provides instant, accurate results.
Key features include:
Note: This calculator is intended for general arithmetic calculations. For financial calculations involving taxes, loans, or mortgages, please use our specialised calculators which include UK-specific rates and regulations.
Expert Reviewed — This calculator is reviewed by our team of financial experts and updated regularly with the latest UK tax rates and regulations. Last verified: January 2026.
Last updated: January 2026 | Verified with latest UK rates
Our Calculator Online Free Full Screen provides:
Is this calculator free?
Yes, all our calculators are 100% free to use with no registration required.
Are the results accurate?
Our calculators use verified formulas and are regularly updated for accuracy.
Can I use this on mobile?
Yes, all calculators are fully responsive and work on any device.