Scientific Calculator

A scientific calculator goes beyond basic addition and subtraction to handle the trigonometric, logarithmic, exponential, and root functions that show up in algebra, trigonometry, physics, and engineering coursework. Instead of juggling a physical calculator with dozens of small buttons, an online scientific calculator gives you the same sin, cos, tan, log, ln, square root, and power functions in a browser tab you can open from any device.

This tool is built for students working through homework that needs more than arithmetic, professionals double-checking a formula, and anyone who needs to evaluate an expression with parentheses, exponents, or trig functions without reaching for a dedicated calculator app. You can build an expression using the on-screen buttons or type it directly on your keyboard, switch between degrees and radians with the DEG/RAD toggle, store values with the memory keys, and click any entry in the saved history to bring a past calculation back.

Because the calculator evaluates full expressions rather than one operation at a time, it respects standard order of operations, which matters more than most people expect — two calculators can display different answers for the exact same string of numbers and operators if they don't apply the same evaluation rules. Understanding how the underlying math works also helps you catch a typo or a misplaced parenthesis before it produces a wrong answer.

Order of operations is the set of rules that decides which part of an expression gets calculated first: Parentheses, Exponents, Multiplication and Division (left to right), then Addition and Subtraction (left to right), usually remembered with the acronym PEMDAS. This calculator evaluates a typed or built expression as a whole using standard order of operations, so 3 + 4 × 2 correctly returns 11, not 14.

Two calculators can legitimately disagree on the same input when one evaluates strictly left to right without respecting PEMDAS and another applies the full rule set — this is a known source of confusion with cheap four-function calculators. Using parentheses removes any ambiguity, since (3 + 4) × 2 will always evaluate to 14 regardless of how the calculator handles precedence.

• Order: Parentheses → Exponents → Multiplication/Division → Addition/Subtraction
• Example: 3 + 4 × 2 = 11 (multiplication happens before addition)
• Example: (3 + 4) × 2 = 14 (parentheses override the default order)

The DEG/RAD toggle above the display tells sin, cos, tan and their inverses how to read an angle, and it applies immediately to the next calculation. In DEG mode the calculator treats 30 as 30 degrees, so sin(30) returns 0.5; in RAD mode the same functions expect radians, so sin(π ÷ 2) returns 1. A radian is the angle formed when the arc length equals the radius of a circle, and a full circle is 2π radians instead of 360 degrees.

Checking which mode is active before a trig calculation is the single easiest way to avoid a wrong answer, since the current mode is shown both on the toggle and in the corner of the display. If you prefer to convert by hand — or you're following a worked example that does — multiply the degree value by π and divide by 180: radians = degrees × (π ÷ 180). For example, 90 × π ÷ 180 equals π/2 radians, and in RAD mode sin(π ÷ 2) equals 1, matching sin(90°) in DEG mode.

• DEG mode: sin(30) = 0.5, and the inverse functions return degrees too
• RAD mode: sin(π ÷ 2) = 1
• Manual conversion: radians = degrees × π ÷ 180
• A full circle equals 2π radians, or 360 degrees

This calculator provides two separate logarithm functions: log, which is the base-10 logarithm, and ln, the natural logarithm, which uses the mathematical constant e (approximately 2.71828) as its base. The base-10 log of a number answers the question, what power do I raise 10 to in order to get this number? For example, log(1000) equals 3, because 10³ equals 1000.

The natural logarithm answers the same kind of question but with e as the base instead of 10, and it shows up constantly in calculus, compound growth, and exponential decay problems. For example, ln(e) equals 1, since e raised to the first power is e itself. Mixing up log and ln is a common source of wrong answers, since they produce different results for the same input unless the input is 1.

The xʸ button raises a base number to a power, so entering 2 xʸ 5 and pressing equals calculates 2 raised to the 5th power, which is 32. Exponents represent repeated multiplication: 2⁵ means 2 × 2 × 2 × 2 × 2. This same button handles fractional and negative exponents too, since a power isn't limited to whole positive numbers — 2 xʸ 0.5, for instance, calculates the square root of 2.

The √ button calculates a square root directly, which is the inverse operation of squaring a number. The square root of 81 is 9, because 9 × 9 equals 81. Square roots of negative numbers aren't defined in the real number system this calculator works in, so entering a negative value under the root returns an error rather than a result.

• Power example: 2 xʸ 5 = 32 (2 multiplied by itself 5 times)
• Square root example: √81 = 9
• A fractional exponent like xʸ 0.5 is equivalent to a square root

Parentheses let you override the default order of operations and group parts of an expression that should be calculated together before the rest of the equation is evaluated. This matters most when a calculation combines multiple operations, such as averaging two numbers before dividing: (15 + 25) ÷ 2 correctly calculates the average of 15 and 25 as 20, while 15 + 25 ÷ 2 would divide only the 25 by 2 first, giving a completely different result of 27.5.

Parentheses can also be nested inside each other for more complex expressions, such as trig or log functions applied to the result of another calculation. Every opening parenthesis needs a matching closing one — an unbalanced expression, such as one open parenthesis with no closing bracket, produces an error when evaluated rather than a number.

In addition to clicking the on-screen buttons, this calculator accepts direct keyboard input once you click the calculator to focus it. Typing digits, +, −, ×, ÷ (as / and *), decimal points, and parentheses builds the expression exactly as if you'd tapped the matching buttons, which is faster for longer calculations.

A few keys map to specific actions: Enter or the equals key evaluates the current expression, Backspace deletes the last character you typed, and Escape clears the calculator entirely, equivalent to pressing the AC button. The caret symbol (^) is also accepted as a shortcut for the power operator.

• Enter or = evaluates the expression
• Backspace deletes the last character
• Escape clears the entire calculation

The five memory keys work the way they do on a physical scientific calculator: MS stores the value currently on the display, MR recalls it into the expression you're building, M+ adds the current value to what's already in memory, M− subtracts it, and MC empties memory. A small M indicator appears next to the DEG/RAD toggle whenever memory holds a value, so you always know whether a recall will bring something back.

Every evaluated calculation is added to a scrollable history list below the keypad, showing the expression and its result. Clicking an entry loads it back into the display so you can re-run it or edit it into a new calculation, and a clear button empties the list. The history is saved in your own browser, so it's still there the next time you open the page, and it never leaves your device.

The n! key calculates a factorial — the product of every whole number from 1 up to the value entered, so 5! is 5 × 4 × 3 × 2 × 1, which equals 120. Factorials grow extremely fast, so the calculator stops at 170! (the largest factorial a browser can represent) and explains why rather than showing a meaningless value; negative numbers and decimals also return a plain-language explanation, since factorials are only defined for whole numbers from zero upwards.

• MS store, MR recall, M+ add, M− subtract, MC clear
• Factorial example: 5! = 120
• History is saved in your browser and can be cleared at any time