Scientific Calculator
A full scientific calculator with trig, logs, powers, roots and constants — free and online.
About this calculator
A scientific calculator handles everything a basic calculator does plus trigonometry (sin, cos, tan and their inverses), logarithms, exponents, roots, factorials and the constants π and e. Type a full expression like sin(45)^2 + log(1000) and it respects the correct order of operations. Switch between degrees and radians for trig.
Rather than pressing one operation at a time, you build up a whole expression and it is parsed as a unit: parentheses are resolved first, then exponents and roots, then multiplication and division, and finally addition and subtraction, exactly as the usual PEMDAS/BODMAS rules require. A DEG/RAD toggle controls whether angles are read in degrees or radians, so sin(90) gives 1 in degree mode while sin(π/2) gives 1 in radian mode. Constants π, e and τ, factorials, absolute value and both base-10 and natural logarithms are all available.
For a worked example, entering sin(45)^2 + cos(45)^2 in degree mode returns 1 (the Pythagorean identity), and 5! + sqrt(144) evaluates to 120 + 12 = 132 because the factorial and square root are taken before the addition. Students reach for it in trigonometry, physics and chemistry homework; it also covers everyday needs like powers, percentages and roots without hunting for a physical calculator.
Frequently asked questions
How do I use degrees instead of radians?
Use the DEG/RAD toggle. In DEG mode, sin(90) gives 1; in RAD mode, sin(π/2) gives 1. The mode applies to all trigonometric functions.
Does it follow order of operations?
Yes. It parses the whole expression and applies standard precedence — parentheses, then exponents, then multiplication and division, then addition and subtraction.
What functions are supported?
This scientific calculator supports sin, cos, tan and their inverses, sinh/cosh/tanh, log (base 10), ln, log2, sqrt, cbrt, exp, abs, factorial, and the constants π, e and τ.
How do I calculate an exponent or a root?
Use ^ for powers, so 2^10 is 1024, and sqrt() or cbrt() for square and cube roots. A fractional power also works — 27^(1/3) gives 3 — because the whole expression is parsed with correct precedence.
What is the difference between log and ln?
log is the base-10 logarithm, so log(1000) is 3, while ln is the natural logarithm to base e, so ln(e) is 1. There is also log2 for base-2 logarithms.
How do I calculate a factorial?
Enter a whole number followed by the factorial function, for example 5! which gives 120 (5 × 4 × 3 × 2 × 1). Factorials grow very quickly, so large inputs produce very large results.
Can I use π and e in an expression?
Yes. Type π (pi) and e directly inside an expression, such as 2*π*5 for a circumference or e^2, and they are substituted with their full precision before the expression is evaluated.
Results are estimates for general guidance only, not financial, medical or tax advice.