Student checking arithmetic
Enter expressions naturally and understand precedence.
Type or paste an expression, choose angle mode, evaluate, and restore a recent in-session expression.
Can reproduce right-associative power and unary-minus behavior.
Math & Science Calculator
Scientific Calculator. Evaluate typed or button-built arithmetic, powers, trigonometry, logarithms, roots, and constants with a bounded no-eval parser and explicit degree/radian mode.
Use this result well
- Inputs that matter
- A typed, pasted, or button-built expression up to 500 characters using documented operators/functions/constants and an explicit degree or radian mode
- Output to expect
- One finite IEEE 754 numeric result plus up to ten in-session history entries and optional memory value
- How it works
- A bounded no-eval recursive-descent parser with right-associative powers, unary precedence, strict scientific notation, function-domain validation, and singular-tangent rejection
- No implicit multiplication, factorial, symbolic algebra, arbitrary precision, complex numbers, or dimensional analysis; functions require parentheses.
- log is base 10, ln is natural log, trig follows the selected angle mode, and c/g are numeric SI reference values only.
Choose your path
Built around the job you need to finish
Evaluate a bounded, documented real-number expression consistently from typing or buttons without eval, permissive token parsing, or hidden angle assumptions.
Keyboard-first user
Edit and evaluate without relying on the button grid.
Focus the expression input, type/paste, use Enter to evaluate and Escape to clear.
Receives the same strict result and domain handling as button input.
Technical quick-check user
Know numeric and unit limits before relying on a result.
Review IEEE 754, supported grammar, angle, constant, and no-dimensional-analysis disclosures.
Moves symbolic, arbitrary-precision, complex, or unit-aware work to an appropriate system.
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Projects using Scientific Calculator
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Standard Calculation
The recursive-descent parser tokenizes at most 500 characters/tokens and applies a documented grammar. Powers associate right-to-left and bind more tightly than unary minus.
-2^2 = -(2^2) = -4; 2^3^2 = 2^(3^2) = 512Angles and functions
sin, cos, and tan follow the selected degree or radian mode. log is base 10; ln is natural log. Functions require parentheses and invalid real-number domains return Error.
Validation & Verification
Malformed numeric literals, trailing tokens, division by zero, square roots of negative values, non-positive logarithms, non-finite results, and detected tangent singularities return Error. Constants c and g are numeric SI reference values; the tool does not perform dimensional analysis.
Updated: August 2026
Example Scenarios
A student enters sin(30) in degree mode and checks that the result is 0.5, then switches to radians for sin(pi/2).
An engineer evaluates a bounded numeric expression, aware that c and g are bare SI reference numbers and units are not tracked.
A user pastes 2e3 + sqrt(16), reviews the result, and restores a recent in-session expression without assuming arbitrary precision or permanent history.
FAQ
Results use JavaScript IEEE 754 double-precision numbers, so rounding applies. The parser validates its supported grammar and domains, but this is not arbitrary-precision, symbolic, interval, or dimensional mathematics.
Yes, our Scientific Calculator is completely free with no registration required. There are no usage limits, hidden fees, or account setup — just open the tool and calculate.
Yes, the Scientific Calculator is fully responsive and works on all devices including phones, tablets, and desktops. All calculations run in your browser for fast, private results.
Use +, −, *, /, ^, parentheses, scientific notation, sin, cos, tan, log, ln, sqrt, abs, and constants pi, e, phi, c, and g. Functions require parentheses and implicit multiplication such as 2pi is rejected.
Evaluation runs locally in the browser with a purpose-built parser and does not use eval. Avoid pasting sensitive information into any web page; the calculator only needs mathematical expressions.
About Scientific Calculator
Type, paste, or build an expression with buttons, choose degrees or radians, and evaluate it locally. The parser supports a documented finite grammar and rejects malformed numbers, unsupported implicit multiplication, division by zero, invalid domains, and tangent singularities.