A large, easy-to-use, and convenient online calculator for everyday use
You can use it for work, school, or personal calculations. Perform not only simple math calculations, but also calculate loan interest, bank lending rates, and the cost of services and utilities. You can enter commands not only with the mouse, but also with a keyboard. See detailed instructions below.
How to use the online calculator
Key functions
- [ 0 ], [ 1 ], [ 2 ], ... [ 9 ] — standard number keys;
- [ . ] — inputs a decimal point;
- [ +/- ] — changes the sign of the number;
- [ XY ] — raises X to the power of Y;
- [ √ ] — calculates the square root;
- [ + ] — addition, [ - ] — subtraction, [ × ] — multiplication, [ ÷ ] — division;
- [ % ] — calculates percentages;
- [ M+ ] — adds to memory;
- [ MC ] — erases the memory content;
- [ AC ] — resets the calculator and clears both current and saved memory;
- [ ( ] and [ ) ] — groups operations with parentheses.
Scientific functions (added for advanced calculations)
- [ sin ], [ cos ], [ tan ] — trigonometric functions (sine, cosine, tangent);
- [ sin⁻¹ ], [ cos⁻¹ ], [ tan⁻¹ ] — inverse trigonometric functions (arcsine, arccosine, arctangent);
- You can switch between degrees and radians for angle measurements.
Examples of calculations on the online calculator
Try these common calculations to get started:
- Addition: 12 + 34 = 46
- Multiplication: 7 × 8 = 56
- Square root: √(144) = 12
- Percentage: 20% of 150 = 30
- Scientific: sin(30°) = 0.5 (in degree mode)
- Inverse sine: sin⁻¹(0.5) = 30° (in degree mode)
Why dark and light mode matter
A calculator often stays open in a browser tab for long stretches while you work through a spreadsheet, a budget, or homework. Dark mode reduces glare and eye strain in low light, while light mode is easier to read in bright rooms or direct sunlight. Toggling between them takes one click, and the choice applies instantly without a page reload.
Frequently asked questions
Is this calculator suite free to use?
Yes. Every calculator on this page is free, requires no sign-up, and works on both desktop and mobile browsers.
Can I use my keyboard instead of clicking?
Yes, for the basic and scientific calculators. Number keys, plus, minus, multiply, divide, Enter, Backspace, and Escape all work directly.
What functions does the scientific calculator include?
Sine, cosine, tangent, their inverses, natural log, base-10 log, factorial, square, square root, powers, parentheses, and the constants π and e, with a toggle between degrees and radians for trig functions.
Should trig functions be in degrees or radians?
Use degrees for most everyday and classroom problems (a right angle is 90°), and radians for calculus or physics contexts where angles are expressed as multiples of π. The calculator's DEG/RAD label shows which mode is active at all times.
Does switching between dark and light mode save my preference?
Your choice applies instantly and stays for your current session on the page. Reloading in a new session returns to the default theme.
Is the BMI calculator accurate for everyone?
It gives a standard estimate based on height and weight only. It doesn't account for muscle mass, frame size, age, or sex, so it should be treated as a general screening figure rather than a personal health assessment.
Does the loan calculator include fees or taxes?
No. It calculates the principal and interest portion of a fixed-rate loan only. Real payments may be higher once fees, insurance, or local taxes are added by your specific lender.