Scientific Calculator

Tap the keys or type on your keyboard to work out trigonometry, logarithms, powers, roots and factorials. Every answer is saved in the history strip so you can reuse it.

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Keyboard: digits, + − * / ^ ( ) ! %, Enter for =, Backspace, Esc to clear, s c t for sin cos tan, l log, n ln, r √, p π, a Ans.

History – tap a line to reuse it

Your calculations appear here.

Free online scientific calculator

This scientific calculator online does everything a pocket model does for school, college and competitive exams: trigonometry (sin, cos, tan and their inverses), logarithms (log and ln), square roots, squares and any power x^y, factorials, percentages, brackets, π and e. It is a free scientific calculator that runs in your browser – no download, no app, no sign-up – and it works with a mouse, a touch screen or your physical keyboard. Every answer is written to the history strip, and the Ans key reuses your last result.

What is a scientific calculator? (scientific calculator kya hota hai)

A scientific calculator is a calculator that understands the order of operations and has keys for functions used in science, engineering and statistics. A basic calculator adds, subtracts, multiplies and divides one step at a time. A scientific calculator lets you type a whole expression such as 2 × sin(30) + √(16) and evaluates it correctly, applying powers before multiplication and multiplication before addition.

How to use this scientific calculator

Type the expression with the keys or the keyboard exactly as you would write it: 5 + 3 × 2^3.
Functions open a bracket for you: pressing sin writes sin(. Type the angle and close the bracket – or leave it open, because missing closing brackets are added automatically.
Choose DEG or RAD with the top-left key before using trig functions. DEG is the default and is what most school problems use.
Press = (or Enter). The answer appears on the screen and on the history tape. Tap any history line to insert that result into a new calculation.
Keep going: after =, pressing an operator such as × continues from the answer (Ans × …); pressing a digit starts a fresh calculation.

Keyboard shortcuts: digits and + - * / ^ ( ) ! % ., Enter for equals, Backspace to delete, Esc to clear, and letter keys s, c, t (sin, cos, tan), l (log), n (ln), r (√), p (π) and a (Ans).

Order of operations

The calculator follows the standard BODMAS / PEMDAS rule, the same one used by Casio and Sharp models:

Brackets
Factorial and percent (n!, x%)
Powers and roots (x^y, x², √) – evaluated right to left, so 2^3^2 = 2^9 = 512
Unary minus – so −3² = −9, while (−3)² = 9
Multiplication and division, left to right – including implied multiplication such as 2π or 3(4 + 1)
Addition and subtraction, left to right

Scientific calculator formula list: what each key does

Key	Meaning	Example	Result
sin, cos, tan	Trigonometric ratios of an angle	sin(30) in DEG	0.5
sin⁻¹, cos⁻¹, tan⁻¹	Inverse trig: the angle for a ratio	tan⁻¹(1) in DEG	45
log	Common logarithm, base 10	log(1000)	3
ln	Natural logarithm, base e	ln(e)	1
√	Square root	√(144)	12
x², xʸ	Square and any power	2^10	1024
n!	Factorial of a whole number	5!	120
%	Divide by 100	18% × 2500	450
π, e	Constants 3.14159… and 2.71828…	2π	6.28318530718
Ans	The previous answer	Ans ÷ 2	half the last result

Degrees vs radians

Angles can be measured in degrees (a full turn is 360°) or radians (a full turn is 2π). sin(90) is 1 in DEG mode but 0.894 in RAD mode, because 90 radians is a very different angle. Use degrees for most school geometry and trigonometry; use radians for calculus, physics formulas with angular frequency, and whenever an angle is written with π, such as sin(π/6). The inverse functions return their answer in the unit you have selected. tan(90°) is undefined, and the calculator tells you so instead of printing a meaningless huge number.

How to use percentage on a scientific calculator

On this calculator, % simply divides the number before it by 100. So to find 18% of 2,500, type 18% × 2500 or 2500 × 18% – both give 450. To add 18% GST to ₹2,500, type 2500 × (1 + 18%) = 2,950. For marks, discounts and hikes with the working shown, the percentage calculator is quicker.

Log base 2 and other bases

The calculator has log (base 10) and ln (base e). For any other base use the change-of-base rule: log_b(x) = log(x) ÷ log(b). For log base 2 of 64, type log(64) ÷ log(2) = 6. The log calculator does this directly for any base.

Scientific notation on the calculator

Scientific notation writes a number as a × 10ⁿ, where a is between 1 and 10. Very large and very small answers are shown in this form using E: 6.02214076E23 means 6.02214076 × 10²³. You can type E yourself inside a number – for example 3E8 for the speed of light, 3 × 10⁸ m/s – or use × 10^. To calculate scientific notation without a calculator, move the decimal point until one non-zero digit is left of it and count the moves: 45,000 = 4.5 × 10⁴, and 0.0032 = 3.2 × 10⁻³.

Worked examples

Height of a building: from 40 m away, the top is at an angle of 35°. Height = 40 × tan(35) = 28.01 m.
Compound growth: ₹10,000 at 8% for 5 years = 10000 × 1.08^5 = 14,693.28.
Combinations: ways to choose 3 from 7 = 7! ÷ (3! × 4!) = 35.
pH: for [H⁺] = 3.2E−5, pH = −log(3.2E−5) = 4.49.
Quadratic roots: for x² − 5x + 6 = 0, (5 + √(25 − 24)) ÷ 2 = 3 and (5 − √(1)) ÷ 2 = 2. The quadratic equation calculator solves any a, b, c.

Scientific calculator vs basic, financial and graphing calculators

A scientific calculator vs normal calculator: the basic calculator has only + − × ÷, %, √ and memory, and works one operation at a time. A financial calculator (such as a BA II Plus) adds time-value-of-money keys for EMI, NPV and IRR but has fewer maths functions. A graphing calculator plots equations and is usually programmable. A scientific calculator sits in the middle – which is why it is the standard for Class 11–12, B.Tech and engineering students.

Scientific calculator for GATE, TCS iON and other exams

Many computer-based exams in India, including GATE, CSIR NET and exams conducted on the TCS iON platform, do not allow your own device. They provide an on-screen virtual scientific calculator instead, and physical calculators are not permitted. Practising on this page helps you get used to typing full expressions, using brackets and switching between degrees and radians before exam day. School and university exams that allow physical calculators usually require a non-programmable scientific calculator without text memory – check your exam's rules.

Tips for accurate answers

Use brackets generously: 1 ÷ (2 × 3) is not the same as 1 ÷ 2 × 3.
Check the DEG/RAD indicator before every trig question.
Results are shown to 12 significant digits; the history keeps every step so you can retrace your work.
Factorials work for whole numbers up to 170! – larger values are too big to display.

Online scientific calculator simulator vs a physical one

This page works as a scientific calculator simulator: the same functions as a handheld model (trig, logs, powers, roots, factorials, memory) in your browser, at no cost. It helps you practise before an exam or check homework when your own calculator is not with you.

Scientific calculator price: how much does one cost?

This online version costs nothing. How much a physical one costs depends on the model: basic non-programmable models are widely sold for a few hundred rupees, while advanced models such as the Casio fx-991 series cost more. A scientific calculator under 200 rupees is usually a basic model, so check that it has the functions your syllabus needs (log, trig, powers, statistics). The price and rate of each scientific calculator model change often, so compare current sellers; on GST invoices, they fall under HSN code 8470.

Scientific calculator vs non scientific calculator

A non scientific (basic) calculator only adds, subtracts, multiplies, divides and finds percentages and square roots, working left to right. A scientific calculator follows the order of operations and adds sin, cos, tan, log, ln, powers, factorials and scientific notation.

Scientific calculator for engineering and BTech students

A scientific calculator for engineering students should handle radians, complex expressions, scientific notation and statistics. Most universities allow a non-programmable model such as the Casio ES series (fx-82ES, fx-991ES) in exams, so a scientific calculator for BTech students is usually one of these. Check your exam rules before you buy.

Scientific calculator equation mode and quadratic equations

On a Casio fx-991ES, press MODE, then 5 (EQN), then 3 for aX² + bX + c = 0. Enter a, b and c and press = to see each root. On this online scientific calculator, type the quadratic formula directly, or use the quadratic equation calculator for roots, vertex and steps.

Scientific calculator with fraction key

Handheld models have an a b/c or fraction key that keeps answers as fractions. This online version gives decimals; to add, subtract or simplify fractions and see the result as a fraction, use the fraction calculator.

How to off a scientific calculator

On most Casio scientific calculators, press SHIFT and then AC to switch off; many also turn off automatically after about 10 minutes of no use. Solar models may not need an off key at all. This online calculator needs no switching off: just close the tab.

Scientific calculator image and layout

If you are looking for a scientific calculator image to learn the keys, the layout above follows the usual order: number pad at the bottom, operators on the right and function keys (sin, cos, tan, log, ln, x², √, xʸ) at the top. Some handheld models are sold as a scientific calculator with writing pad for rough work; online, keep a notebook beside you.

Scientific calculator in Hindi

In Hindi, a scientific calculator is called a vaigyanik calculator. The keys are the same: sin, cos, tan, log and powers work exactly as described on this page.

Scientific calculator integration and JavaScript

Advanced handheld models such as the fx-991ES have an integration key (∫dx) that estimates a definite integral numerically. This online scientific calculator does not integrate; it evaluates expressions. It is written in plain JavaScript and runs entirely in your browser, so nothing you type is sent to a server.

Frequently asked questions

Is this scientific calculator free to use online?

Yes. It is a free online scientific calculator that runs in your browser on mobile and desktop, with no download or sign-up.

How do I switch between degrees and radians?

Press the DEG/RAD key at the top left of the keypad. DEG is the default. The inverse trig functions also return their answer in the selected unit.

How do I calculate log base 2 on a scientific calculator?

Use the change-of-base rule: log(x) ÷ log(2). For example, log(64) ÷ log(2) = 6.

How do I use percentage on a scientific calculator?

The % key divides the number before it by 100, so 18% × 2500 = 450. To add a percentage, multiply by (1 + rate%), for example 2500 × (1 + 18%) = 2950.

What is the difference between a scientific calculator and a normal calculator?

A normal calculator only does basic arithmetic one step at a time. A scientific calculator follows the order of operations and adds trigonometry, logarithms, powers, roots, factorials and constants such as π and e.

Can I use my keyboard with this calculator?

Yes. Type digits and + - * / ^ ( ) ! %, press Enter for equals, Backspace to delete and Esc to clear. Letter shortcuts are s, c, t for sin, cos, tan, l for log, n for ln, r for square root, p for π and a for Ans.

Which calculator is allowed in the GATE exam?

GATE does not allow personal calculators. Candidates use the on-screen virtual scientific calculator provided in the exam, so practising with an online scientific calculator is helpful.

Why does the calculator show E in the answer?

E means "times ten to the power of". 1.5E12 is 1.5 × 10^12. Very large or very small results are shown in this scientific notation.

How do I switch off a Casio scientific calculator?

Press SHIFT then AC. Most models also switch off on their own after a few minutes.

Is this online scientific calculator free?

Yes. It costs nothing, needs no download and works on phones and computers.

Which scientific calculator is allowed in engineering exams?

Most exams allow non-programmable models such as the Casio fx-82ES or fx-991ES. Always check your university or exam rules.

What is the price of a scientific calculator online?

This online scientific calculator is free. Physical models range from basic budget ones to advanced models costing more; compare current prices before buying.

Can a scientific calculator solve a quadratic equation?

Yes. On a Casio fx-991ES use MODE 5 (EQN) then 3. Online, use the quadratic equation calculator linked above.

Scientific calculator how to use for log base 2?

Use the change-of-base rule: log₂(x) = log(x) ÷ log(2). The scientific calculator log base 2 of 32 is 1.50515 ÷ 0.30103 = 5.

Do I need a scientific calculator app or download?

No. This page works in the browser, so there is nothing to download. An app only helps if you need it offline.

Is a scientific calculator non programmable?

Most are. A scientific calculator non programmable model such as the fx-82 or fx-991 series is the type most exams allow.

Last updated 2026-09-18