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    Scientific Calculator Online — Free Calc with Trig & Logarit

    Calculate advanced math problems: trigonometry (sin, cos, tan), logarithms (log, ln), exponents, & factorials. Use this free online scientific calculator in-bro

    0

    💡 Tip: Use your keyboard — digits, operators, Enter (=), Backspace, and Esc (clear) all work.

    History

    Your calculations will appear here

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    A scientific calculator that behaves properly

    Trigonometry, logs, powers, roots, constants and memory, with the expression visible while you type it.

    See the whole expression

    Long calculations are easier to trust when you can read what you entered instead of watching a single number change.

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    See the whole expression

    Functions coursework needs

    sin, cos, tan and their inverses, natural and base-10 logs, powers, roots, factorials, π and e — degrees or radians.

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    Functions coursework needs

    Keyboard-friendly on desktop

    Type expressions directly and use memory keys, which is much faster than clicking buttons for a page of homework.

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    Keyboard-friendly on desktop

    Step-by-step guide

    How to use Scientific Calculator?

    A full scientific calculator with trig, logs, exponents, factorials and memory.

    Step-by-step instructions

    1. 1

      Type an expression using the on-screen keypad or your keyboard.

    2. 2

      Use SIN, COS, TAN, LOG, LN, √, x², xʸ and other functions.

    3. 3

      Switch between degrees and radians as needed.

    4. 4

      Press = to get the answer.

    5. 5

      Use memory (M+, M-, MR) to hold intermediate results.

    Benefits

    • Supports parentheses and complex expressions.
    • Toggle between DEG and RAD for trig functions.
    • Memory buttons for multi-step problems.
    • Free, fast and always available online.

    Who is it for?

    • High school and college students
    • Engineers doing quick on-the-job math
    • Scientists checking calculations

    FAQ

    Frequently asked questions

    The calculator provides standard scientific functions: sin, cos, tan (and inverse arcsin/acos/arctan via the INV toggle), log (base 10), ln (natural log), e^x, ^ (power), factorial (!) and a Γ (gamma) button for non-integer factorials, plus constants π and e. It also supports complex arithmetic using the i button, parentheses, percentage, and basic memory keys M+, M-, MR, MC. Results and keystrokes are shown in the History panel and you can export that history as a CSV file (history.csv) from the Export CSV button.

    Use the DEG/RAD toggle located above the numeric keypad — it shows the active mode (DEG or RAD) and is sticky in the same browser session. On desktop Chrome/Firefox the toggle persists via localStorage across normal sessions, but private/incognito windows do not retain the setting. If you get unexpected values, check the top-right label; for example entering sin(30) with DEG shows 0.5, while with RAD it gives -0.988... — change the toggle and press = to re-evaluate.

    Calculations use JavaScript IEEE-754 double precision, so you get roughly 15–17 significant digits and maximum finite value about 1.7976931348623157e308 (Number.MAX_VALUE) and minimum ~5e-324. The expression input field accepts about 200 characters; extremely long chained expressions may slow down mobile browsers. History export is limited to 500 rows to avoid large downloads; if you need higher precision or arbitrary-size integers use a desktop tool (Python decimal, PARI/GP) because this calculator is optimized for fast browser numeric evaluation, not arbitrary-precision math.

    Press the ! button after an integer (e.g., 10! = 3628800); factorials are implemented with IEEE double precision and integer factorials above 170 return Infinity because 171! exceeds Number.MAX_VALUE. For non-integer factorials use the Γ (gamma) button in the Advanced panel — for example Γ(4.5) computes using the Lanczos approximation and supports complex arguments like Γ(2+0.5i). If you need exact symbolic factorials (n!), use a CAS like Mathematica or SymPy; this tool provides numeric approximations only.

    Yes — type complex literals using i (for example 2+3i) or press the i button; functions like exp, log, sin, cos operate on complex inputs and return complex results in the form a+bi. The calculator uses principal branches for multi-valued functions, so log(-1) returns 0+3.141592653589793i (principal value) and arg is between -π and π; be careful with discontinuities on branch cuts. If you need a different branch, add/subtract multiples of 2πi manually or use a desktop CAS for full branch control.

    This calculator does not perform symbolic algebra or automatic equation solving; it evaluates numeric expressions only. To find roots numerically you can use manual bisection/Newton-style guesses: enter f(x) as an expression using Ans or a temporary variable, evaluate it at two guesses using the History panel, then refine guesses until the result is sufficiently close to zero. For automated root finding, export a CSV of sample points and use Excel, Python (numpy/scipy), or a graphing tool like Desmos that supports solvers and plotting.

    The interface shows messages like Syntax Error (unmatched parentheses), Math Error (domain errors like log(-3) in real mode), Overflow/Infinity (values beyond ~1.797e308), and Undefined (e.g., tan(90°) in DEG mode). Fix Syntax Error by checking parentheses and using the backspace or Clear (C/AC) buttons; for domain issues switch to complex mode using i or change DEG/RAD for trig; for overflow reduce the exponent or use logarithms. If a calculation stalls on mobile, simplify the expression and avoid more than ~200 char inputs.

    Open the History panel and click Export CSV to download a UTF-8 encoded history.csv file; each row contains timestamp (ISO 8601), the entered expression, result (as plaintext), and the DEG/RAD mode used. The export is limited to the last 500 entries to keep file size reasonable; individual results can be copied with the Copy button next to each history row which places plain text (no formatting) on the clipboard. There is no server-side account storage — downloads happen locally in your browser; if you need longer archives copy-paste into your own spreadsheet.

    The core Scientific Calculator Online — Free Calc with Trig & Logarit is free to use with no signup required and no watermark on numeric results. The site is ad-supported in some views; there is an optional donation link but no paid upgrade that unlocks features. Calculations are performed in your browser (local JS), so no account is required for computing, but clearing browser data will remove local History and settings like DEG/RAD unless you export them first.

    On desktop (Chrome/Firefox/Edge) you get full keyboard input (type sin(, log(), ^, numbers, Enter for =) and arrow keys to move the caret; add-ons like external keyboards work reliably. On mobile the calculator shows a larger touch keypad and supports the on-screen keyboard for typing, but iOS Safari can sometimes restrict arrow-key navigation or external keyboard focus — adding the page to Home Screen provides a full-screen web app experience that improves focus. Mobile devices with limited RAM may slow on very large expressions; in that case split the work into smaller steps or use a desktop.

    This calculator is optimized for quick numeric evaluations (trig, logs, factorials, complex arithmetic) and interactive use in a browser, but it lacks batch processing, plotting, symbolic algebra, and arbitrary-precision math found in MATLAB, Mathematica or Python with libraries. For engineering workflows with large data sets, matrices, or built-in solvers use MATLAB/Octave or Python (numpy/scipy); if you need exact symbolic manipulation use SymPy or Mathematica. The trade-off is convenience and zero install versus the advanced capabilities and performance of desktop tools.

    Use the keyboard: numbers and + - * / ^ work directly, Enter equals =, Backspace deletes, and typing sin( or log( will insert the function token; press the Ans button to reuse the last result without retyping. Use M+ to store a value, MR to recall, and MC to clear memory for iterative calculations. Toggle INV to access inverse trig functions, use the π and e buttons for exact constants, and keep expressions under ~200 characters to avoid mobile slowdowns; export history via Export CSV for batch reuse in spreadsheets or scripts.

    About this tool

    Scientific calculator online — kalkulator scientific for browser

    Whether you're a student grinding through trigonometry homework, an engineer double-checking a quick conversion, a finance analyst running compound-interest sums, or just someone who needs to compute a tip with a square root in it, our online scientific calculator gives you every function from a classic TI-30 or Casio fx-series — without installing anything. Sin, cos, tan and their inverses, natural and base-10 logarithms, exponentials, powers, roots, factorials, π, e, percentages, parentheses for nested expressions, and a full Memory bank (M+, M−, MR, MC) for keeping a running total all sit one tap away on a clean keypad that works on phone, tablet and desktop.

    Switch between degrees and radians at the top of the display so trigonometric results match what your textbook, physics lab or CAD software expects — a common source of wrong answers when students copy a value from an online calc that defaults to the wrong mode. The display shows the full expression as you type, so you can see exactly what's being calculated (no more wondering whether the parentheses landed where you wanted), and a small 'Ans' button instantly drops the last result back into your expression for chained calculations like (Ans × 1.18) − 240.

    Speed matters when you're working through a problem set. Every button on the on-screen keypad also has a keyboard shortcut: digits 0–9, + − × ÷, parentheses, ^ for powers, Enter to compute, Backspace to undo a single character, and Esc to clear the whole expression. The History panel on the right keeps every calculation from your current session — click any past result to drop it back into the input, perfect for working through long problems where you need to reference earlier answers.

    Everything runs in pure JavaScript inside your browser, so calculations are instant even on a slow connection — and they keep working with no internet at all once the page has loaded. Nothing you type is sent to a server, nothing is logged, and there are no popups or upsells. It's a real scientific calculator that just happens to live in a browser tab, with the same accuracy and almost the same key layout as the hardware models students are used to.

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