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Free Scientific Calculator Online
Use an advanced scientific calculator for arithmetic, powers, roots, logarithms, trigonometry, constants and factorials.
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Process your files or inputs directly in your browser. Many workflows run locally; features that need network data or a service are identified on their tool page.
At a glance
Scientific Calculator — Use an advanced scientific calculator for arithmetic, powers, roots, logarithms, trigonometry, constants and factorials.
Free for the core workflow, no account required. The calculation is performed locally in the browser from the values you enter.
About Scientific Calculator
Use an advanced scientific calculator for arithmetic, powers, roots, logarithms, trigonometry, constants and factorials.
The calculator evaluates structured mathematical expressions without requiring a separate desktop calculator. Choose degrees or radians for trigonometric functions and review previous calculations from the built-in history. Beyond basic arithmetic: trigonometric functions (with degree/radian mode — the classic exam mistake), logarithms, exponents, roots, factorials, and constants. The degree/radian toggle is the single most important setting to check before trusting a result. Worked example — compound growth, the calculation that separates a scientific calculator from a basic one. Investing $1,000 at 5% per year for 10 years is 1,000 × (1.05)^10. The exponent first: 1.05^10 = 1.62889. Then the multiplication: 1,000 × 1.62889 = $1,628.89. The same exponent key answers a different question in reverse: what annual rate doubles money in 10 years? 2^(1/10) − 1 = 1.0718 − 1 = 7.18% per year. Table — the core functions on familiar numbers: sin(30°) = 0.5, sin(45°) ≈ 0.7071, sin(90°) = 1; log₁₀(1,000) = 3 because 10³ = 1,000; ln(e) = 1; √144 = 12; 2^10 = 1,024; 5! = 120. Before / after — before: a phone calculator with no exponent key and a guessed answer for (1.05)^10; after: the exact exponent, the intermediate value, and the final dollar figure, with the history kept so the same expression can be re-run with 6% instead of 5%. The single most expensive mistake is the degree/radian toggle: sin(30) in radian mode is −0.988, not 0.5, because 30 radians is a different angle from 30 degrees — geometry and textbook problems almost always want degrees, while calculus wants radians. The second classic is order of operations: 2 + 3 × 4 is 14, not 20, because multiplication happens before addition, and the calculator follows that rule even when the person typing does not. Sources: National Institute of Standards and Technology, “Digital Library of Mathematical Functions” (accessed November 2026); Abramowitz and Stegun, “Handbook of Mathematical Functions” (1972). Content last reviewed: November 2026.
Primary objective: Evaluates arithmetic, powers, roots, logarithms, trigonometric functions, constants and factorials.
Privacy assurance: The calculation is performed locally in the browser from the values you enter.
How to Use Scientific Calculator
- Enter a mathematical expression or use the function buttons.
- Choose degrees or radians when using trigonometric functions.
- Calculate the result and use the history to revisit earlier expressions.
- Check the degree/radian mode before any trigonometry — degrees for geometry and school problems, radians for calculus.
- Type the full expression with brackets instead of doing it in pieces; the calculator respects order of operations.
- Use the exponent key for growth and decay: principal × (1 + rate)^periods, not repeated multiplication.
- Use log for base-10 scales (decibels, pH, Richter) and ln for natural growth and calculus.
- Revisit the history to re-run an expression with one changed number instead of retyping the whole thing.
Key Use Cases & Applications
- school mathematics
- engineering calculations
- quick scientific reference
- Quick trigonometry checks during physics problem sets.
- Engineering calculations without reaching for a physical calculator.
- Working out compound growth: what $1,000 becomes at 5% across 10 years.
- Checking sin, cos, and tan values for a physics problem set in degree mode.
- Converting between logarithmic scales such as pH and decibels.
Frequently Asked Questions
Does it support trigonometry?
Yes. Sine, cosine, tangent and their inverse functions are supported.
Does it support logarithms?
Yes. Natural logarithm and base-10 logarithm functions are available.
Can I use factorial?
Yes, for non-negative integers within the calculator safety range.
Why is sin(30) giving the wrong answer?
You are in radian mode. 30 radians is not 30 degrees — switch to degree mode for geometry and most textbook problems.
What is the difference between log and ln?
log is base-10 (common in engineering scales like decibels and pH); ln is base-e (natural, used in calculus and growth models).
How do I calculate compound growth?
Use the exponent: principal × (1 + rate)^periods. For repeated financial math, the dedicated compound interest calculator is clearer.
Why is sin(30) giving −0.988 instead of 0.5?
You are in radian mode. 30 radians is not 30 degrees — switch to degree mode for geometry and most textbook problems.
Why does my calculator give an error for log of a negative number?
Logarithms are undefined for zero and negative numbers in the real number system — there is no real power that turns 10 into −5. A negative input needs complex numbers, which this calculator does not do.
How do I calculate 5% growth across 10 years?
Use the exponent: 1,000 × (1.05)^10 = 1,000 × 1.62889 = $1,628.89.
Why does 2 + 3 × 4 equal 14 and not 20?
Multiplication comes before addition in the order of operations. To force the addition first, write (2 + 3) × 4 = 20.
What is e, and when do I use it?
e is about 2.71828, the base of natural logarithms. It appears in continuous growth, decay, and compound interest formulas.
How big a factorial can I calculate?
Factorials grow fast — 20! is already about 2.43 × 10¹⁸. Beyond that the result exceeds what the display handles precisely, so use logarithms for very large factorials.