About the Scientific Calculator
A scientific calculator goes far beyond the four basic operations, adding the trigonometric, logarithmic, exponential and power functions needed for science, engineering, statistics and higher mathematics. This one runs in your browser, evaluates whole expressions with the correct order of operations, and supports keyboard entry for speed.
What it can do
The functions fall into a few groups. Powers and roots handle squares, arbitrary exponents (x^y) and square or higher roots. Trigonometry covers sine, cosine and tangent and their inverses — essential for angles, waves and geometry. Logarithms include base-10 log and the natural log (ln), the tools for growth, decay, pH and decibels. Constants such as π and e are available to full precision, and a memory (M+, M−, MR, MC) lets you store and recall intermediate results.
Order of operations — the big difference from a basic calculator
Unlike a simple desk calculator that processes keys strictly left to right, a scientific calculator respects standard mathematical precedence: parentheses first, then exponents, then multiplication and division, then addition and subtraction. So 2 + 3 × 4 correctly returns 14, not 20. When an expression could be read more than one way, add parentheses to make your intent unambiguous — it is the single best habit for avoiding errors.
Degrees, radians and getting trig right
Trigonometric functions depend on the angle mode. The same sin(90) is 1 if the calculator is set to degrees but roughly 0.894 if it is in radians, because 90 radians is a very different angle. Always confirm the mode matches the units of your problem — degrees for everyday geometry, radians for calculus and most physics — before entering trig functions. For everyday arithmetic without the extra functions, the simpler Online Calculator may be quicker. All calculations run privately in your browser.
Worked examples
Precedence: 2 + 3 × 4² evaluates the exponent first (16), then the multiplication (48), then the addition → 50. Force a different reading with brackets: (2 + 3) × 4² → 80.
Trigonometry (degree mode): a ramp rises 1.5 m over a 6 m run. The angle is tan⁻¹(1.5 ÷ 6) = tan⁻¹(0.25) → 14.04°. In radian mode the same keystrokes return 0.245 — the same angle, different units, which is why checking the mode first matters.
Logarithms: to find how many years money at 8% takes to double, use ln(2) ÷ ln(1.08) = 0.6931 ÷ 0.07696 → 9.01 years. That is the exact answer the Rule of 72 approximates as 72 ÷ 8 = 9.
Frequently Asked Questions
Does the calculator work in degrees or radians?
Angle mode matters for trigonometry: sin(90) is 1 in degrees but about 0.894 in radians. Check which mode the calculator is in before entering trig functions, and switch if needed so your angles are interpreted correctly.
What is the difference between log and ln?
“log” is the base-10 logarithm (log₁₀), the inverse of 10^x, while “ln” is the natural logarithm (base e ≈ 2.71828), the inverse of e^x. Use ln for growth, decay and most scientific formulas; log base 10 for orders of magnitude such as pH or decibels.
How do I calculate powers and roots?
Use the power key (often x^y or ^) to raise a number to any exponent, the square key for x², and the root keys for square and other roots. A cube root is the same as raising to the power of 1÷3.
How does the memory work?
M+ adds the displayed value to memory, M− subtracts it, MR recalls the stored value, and MC clears it. Memory lets you set aside a running subtotal while you work on another part of a calculation.
Does it follow the correct order of operations?
Yes — a scientific calculator evaluates a full expression using standard precedence (parentheses, then exponents, then multiplication and division, then addition and subtraction), unlike a basic calculator that works left to right. Use parentheses to make your intent explicit.
Can I use my keyboard?
Yes — you can type digits, operators and parentheses directly, and use Enter for equals and Backspace to correct, which is far faster than clicking for long expressions.
What are the π and e keys for?
They insert the mathematical constants pi (≈ 3.14159, for circles and trigonometry) and Euler’s number e (≈ 2.71828, the base of natural growth) to full precision, so you do not have to type rounded values.