How to Use the Scientific Calculator

This scientific calculator handles everyday arithmetic as well as advanced functions used in algebra, trigonometry, and engineering. Type numbers using the on-screen keypad or your keyboard, then apply operators like plus, minus, multiply, and divide, or reach for a scientific function such as sine, cosine, logarithm, or square root.

The calculator keeps a running calculation history so you can review earlier results without redoing the math, and the memory keys (M+, M-, MR, MC) let you store a value and recall it later in a longer calculation. The DEG/RAD toggle switches trigonometric functions between degrees and radians, which matters when you are working with angles versus circular measurements.

Common calculations explained

Trigonometric functions (sin, cos, tan): used to find angles or side lengths in triangles, common in geometry, physics, and construction. Make sure DEG or RAD mode matches what your problem expects.

Logarithms (log, ln): log calculates the base-10 logarithm, while ln calculates the natural logarithm (base e). These are used in fields like finance, chemistry (pH calculations), and computer science.

Factorial (n!): multiplies a number by every positive integer below it (e.g., 5! = 5 x 4 x 3 x 2 x 1 = 120), commonly used in probability and combinatorics.

Need to convert a result into words for a document? Use the built-in "Convert Result to Words" option, or try our dedicated Number to Words Converter. For date-based math, see the Date Calculator.

Frequently Asked Questions

Is this scientific calculator free to use? Yes, it's completely free with no sign-up required, and works on desktop and mobile browsers.

Does it save my calculation history? Your history is stored locally in your browser session so you can review recent calculations, but it is not saved permanently to any server.

What's the difference between DEG and RAD mode? DEG (degrees) is the everyday unit for angles (a full circle is 360°), while RAD (radians) is the unit used in most advanced math and physics (a full circle is 2π radians). Switch modes depending on what your formula or textbook expects.