Scientific Calculator
Free online scientific calculator for advanced math — trigonometry (sin, cos, tan), logarithms (log, ln), powers, square roots, percentages, pi and parentheses. Fast, accurate and mobile-friendly.
What is a scientific calculator?
A scientific calculator is an advanced math tool that handles far more than basic arithmetic. Alongside addition, subtraction, multiplication and division, it solves trigonometric functions (sin, cos, tan), logarithms (log and ln), powers and roots, percentages and the constant pi (π). It also respects the proper order of operations and supports parentheses, so you can build complex expressions exactly the way you would write them on paper. This free online scientific calculator works instantly in your browser on any device.
How to use this scientific calculator
Tap the number and operator buttons to build an expression, or type directly into the display. For functions like sin, cos, tan, log, ln and √, tap the button to insert the function and an opening parenthesis, then enter the value and close the bracket — for example sin(30) or sqrt(144). Use x² to square a number and xʸ to raise a number to any power. Switch between degrees (DEG) and radians (RAD) for trigonometry, then press = to evaluate. Use C to clear everything and ⌫ to delete the last entry.
Memory functions explained
Memory keys let you store and reuse values across calculations. M+ adds the current result to memory, MR recalls the stored value into your expression, and MC (memory clear) resets the memory back to zero. The current memory value is always shown above the display so you never lose track of what is stored.
Frequently asked questions
What is a scientific calculator?
A scientific calculator is an advanced calculator that goes beyond basic arithmetic to handle trigonometry (sin, cos, tan), logarithms (log, ln), powers and roots, percentages, the constant pi (π), parentheses and order of operations. It is ideal for students, engineers and anyone doing math, science or engineering calculations.
How do I use trigonometric functions?
Tap the sin, cos or tan button followed by your angle and a closing parenthesis, for example sin(30). By default this calculator works in degrees, so sin(30) returns 0.5. You can switch between degrees (DEG) and radians (RAD) using the mode toggle at the top of the keypad.
What is the difference between log and ln?
log is the base-10 logarithm (log₁₀), so log(1000) = 3. ln is the natural logarithm with base e (≈2.718), so ln(e) = 1. Use log for powers of ten and ln for growth, decay and calculus-related problems.
How do powers and square roots work?
Use x² for squaring a number, the xʸ button (^) to raise a number to any power such as 2^10, and the √ button for square roots like √(144) = 12. You can combine these with parentheses for complex expressions.
Does the calculator follow order of operations?
Yes. It fully respects the standard order of operations (PEMDAS/BODMAS): parentheses first, then exponents, then multiplication and division, and finally addition and subtraction. Use parentheses whenever you want to control the order of a calculation.
Is this scientific calculator free and mobile-friendly?
Yes. The Uni Calculator Hub scientific calculator is completely free, works in any browser with no installation, and is fully responsive with large touch-friendly buttons for phones and tablets.