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Scientific Calculator Full-featured scientific calculator with trigonometry, logarithms, factorials, and more.

Scientific Calculator illustration
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Scientific Calculator

Full-featured scientific calculator with trigonometry, logarithms, factorials, and more.

1

Choose Angle Mode

Select RAD (radians) or DEG (degrees) for trigonometric calculations.

2

Enter Expression

Use the on-screen buttons or type numbers and functions to build your mathematical expression.

3

Calculate Result

Press the equals button to evaluate the expression and see the result.

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What Is Scientific Calculator?

This scientific calculator provides all the functions you'd find on a physical scientific calculator, directly in your browser. It handles basic arithmetic (addition, subtraction, multiplication, division) as well as advanced operations including trigonometric functions (sine, cosine, tangent), logarithms (base-10 and natural), square roots, exponents, factorials, and the mathematical constants π and e. You can toggle between radian and degree mode for trigonometric calculations, and use parentheses for complex nested expressions. The memory function (MS, MR, MC) lets you store intermediate results for multi-step problems. Unlike a basic calculator, a scientific calculator respects operator precedence, so 2 + 3 × 4 correctly evaluates to 14, not 20. This tool replaces the need for a physical TI-30 or Casio FX calculator for most academic and professional calculations.

Why Use Scientific Calculator?

  • All scientific functions (trig, log, factorial, exponents) in one tool
  • Toggle between RAD and DEG modes for trigonometry
  • Memory functions (MS, MR, MC) for multi-step calculations
  • Shows both the expression and result for verification
  • Works on any device — no app download required

Common Use Cases

STEM Homework

Solve trigonometry, pre-calculus, and physics problems that require scientific functions.

Engineering Calculations

Quick computations involving logarithms, exponentials, and trigonometric functions.

Test Preparation

Practice scientific calculator operations before standardized tests where calculators are allowed.

Professional Use

Fast scientific computations when you don't have a physical calculator handy.

Technical Guide

The scientific calculator evaluates mathematical expressions using JavaScript's built-in Math library for maximum precision (IEEE 754 double-precision floating point, giving about 15-17 significant digits). Trigonometric functions accept angles in either radians or degrees, with degree inputs internally converted using the formula radians = degrees × π/180. The calculator supports: sin, cos, tan (and their inverse functions via composition), log (base-10 logarithm using Math.log10), ln (natural logarithm using Math.log), square root (√), arbitrary exponents (x^n using Math.pow), factorials (n! computed iteratively for integers up to 170, beyond which JavaScript returns Infinity), and the percentage operation (divides by 100). Expression parsing respects standard mathematical operator precedence: parentheses first, then exponents, then multiplication/division, then addition/subtraction. The calculator uses safe evaluation techniques rather than raw eval() to prevent code injection while still supporting complex nested expressions.

Tips & Best Practices

  • 1
    Use parentheses to ensure correct order of operations in complex expressions
  • 2
    Switch to DEG mode when working with angles in degrees (common in geometry)
  • 3
    The factorial function works for integers 0 through 170
  • 4
    Use MS to store intermediate results during multi-step calculations
  • 5
    Remember that log() is base-10 and ln() is the natural logarithm (base e)

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Frequently Asked Questions

Q What is the difference between RAD and DEG mode?
RAD mode interprets angles in radians (2π = full circle), while DEG mode uses degrees (360° = full circle). Most everyday angle work uses degrees; calculus and physics often use radians.
Q What is the difference between log and ln?
log (or log10) is the common logarithm (base 10), used in decibels and pH calculations. ln is the natural logarithm (base e ≈ 2.718), fundamental in calculus and natural growth processes.
Q Why does sin(180) not give 0 in RAD mode?
In RAD mode, 180 means 180 radians, not 180 degrees. For sin(180°) = 0, switch to DEG mode, or use sin(π) in RAD mode.
Q What is the maximum factorial I can calculate?
170! is the largest factorial that fits in JavaScript's number range. 171! exceeds Number.MAX_VALUE and returns Infinity.
Q How accurate are the calculations?
Results use IEEE 754 double-precision floating point, accurate to about 15-17 significant decimal digits. Minor rounding artifacts may appear in the last digits.
Q Can I use keyboard input?
Currently, the calculator uses on-screen buttons. Use the number buttons, operation buttons, and function buttons to build your expression.

About This Tool

Scientific Calculator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.