Scientific Calculator (Evaluate Expressions Step by Step)

Use this free scientific calculator to evaluate any expression. Type something like (3+2/9)^2 or sin(30) and it returns the result, correctly applying the order of operations. It supports powers, parentheses, trig and inverse-trig functions, square roots, logs, factorials and the constants π and e, with a degrees/radians switch.

How to use the calculator

1. Type or tap an expression into the input.
2. Choose degrees or radians for trig functions.
3. Press Calculate to see the result and how the order of operations was applied.

Order of operations

The calculator evaluates in the standard order: parentheses first, then functions and exponents, then multiplication and division, and finally addition and subtraction — the PEMDAS rule. It parses the expression safely rather than guessing.

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Frequently asked questions

What functions does the calculator support?

sin, cos, tan and their inverses, sqrt, ln, log (base 10), exp, abs and factorial (!), plus the constants pi and e.

Does it follow the order of operations?

Yes — it applies PEMDAS: parentheses, then exponents and functions, then multiplication/division, then addition/subtraction.

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Can I use degrees instead of radians?

Yes — switch the angle mode to degrees and trig functions like sin(30) = 0.5 will use degrees.

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Read the full lesson: learn the method step by step.

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