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Scientific Calculator
An expression calculator with trigonometry, logarithms, powers and factorials.
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About Scientific Calculator
Type a whole expression and evaluate it: trigonometry, logarithms, powers, factorials, percentages, parentheses, and implicit multiplication like 2π. Evaluation uses a hand-written recursive-descent parser rather than eval or new Function, so input is never executed as code.
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Type a whole expression and press equals: trigonometry (sin, cos, tan), base-10 and natural logarithms, square roots, powers, factorials, percentages and arbitrary parentheses.
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Implicit multiplication works: 2π, 3(4+1) and (1+2)(3+4) all multiply without inserting × yourself.
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Evaluation uses a hand-written recursive-descent parser, not eval or new Function — input is never executed as code, and adding a CSP will not require unsafe-eval for this page.
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Build the expression
Buttons append to the expression shown above the result.
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Press equals
Invalid input shows Error instead of a plausible-looking wrong number.
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Negate with ±
It prefixes the whole expression with a minus; press again to undo. It does not insert a minus at the cursor.
Unary minus binds looser than exponentiation, so -2^2 parses as -(2^2). Write (-2)^2 when you want 4.
Exponentiation is right-associative: 3^2 = 9 first, then 2^9 = 512, matching standard mathematical notation. Use (2^3)^2 for the other grouping.
Only non-negative integers from 0 to 170. From 171! the value exceeds double-precision range and shows as ∞, while non-integers like 1.5! are rejected.
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