Scientific Calculator

A full scientific calculator in your browser — trig, logarithms, roots, and more. Free, no signup.

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How to use the Scientific Calculator

  1. Enter your expression. Click the digit, operator, and function buttons to build an expression. The display shows your input as you type.
  2. Evaluate. Press = to compute the result. The answer appears immediately. For unary functions like sin, cos, √, enter the argument first then press the function button.
  3. Continue calculating. Use the result as the starting point for your next calculation, or press AC to clear everything and start fresh.

Why use our Scientific Calculator

Full scientific function set. Includes sin, cos, tan (degrees), log₁₀, natural log, square root, powers, reciprocals, and the constants π and e — everything you need for maths, science, and engineering coursework.
Correct order of operations. Expressions like 2 + 3 × 4 are evaluated correctly as 14, not 20. Parentheses let you control grouping just like a physical calculator.
Runs entirely in your browser. No server round-trips, no account, and no data leaves your device. Works offline once the page has loaded.

Free to use — premium coming soon

FREE
  • All scientific functions
  • Trig in degrees
  • Full order of operations
  • No signup
PREMIUM
  • Remove ads
  • Calculation history
  • Export results

About the Scientific Calculator

The Scientific Calculator is a free in-browser tool that goes well beyond add, subtract, multiply, and divide. It handles trigonometry (sin, cos, tan and their inverses), logarithms (log base 10 and natural log ln), powers and roots (x squared, x to the power y, square root and nth root), factorials, scientific notation, and constants like pi and e. If you have ever reached for a graphing calculator just to evaluate sin(30) or log(1000), this does the same job in any browser tab without an app, login, or download.

Reach for it whenever a problem mixes operations or needs functions a basic calculator lacks: algebra and pre-calculus homework, evaluating a trig ratio for a right-triangle problem, computing decibels or earthquake magnitudes that use logarithmic scales, checking an engineering or physics formula, or working with very large and very small numbers in scientific notation. Students use it to verify hand-worked steps, while engineers, lab workers, and finance users use it for quick, accurate one-off evaluations they do not want to wire into a spreadsheet.

It works by parsing the full expression you type and applying standard order of operations (PEMDAS): parentheses first, then exponents, then multiplication and division, then addition and subtraction. That means you enter an expression the way you would write it on paper, including nested parentheses, rather than pressing keys strictly left to right. A degree/radian toggle controls how angles are interpreted before any trig function runs, so sin(30) returns 0.5 in degree mode but about minus 0.988 in radian mode. Switch the mode to match your problem before you calculate.

Every calculation runs entirely on your device in JavaScript. Nothing you type is uploaded, logged, or sent to a server, so it is safe for sensitive exam practice, work figures, or research numbers. For accuracy, results use standard double-precision floating point, which is exact for everyday math but can show tiny rounding artifacts at the very last decimal of extreme values. To keep results clean, avoid rounding intermediate steps yourself and let the calculator carry full precision until the final answer.

Frequently asked questions

Why does sin(30) give a strange number instead of 0.5?

Your calculator is in radian mode. In degree mode sin(30) is 0.5, but in radian mode it is about minus 0.988. Switch the angle mode to degrees before evaluating trig functions on angles measured in degrees.

What is the difference between log and ln?

log is the common logarithm with base 10, so log(1000) equals 3. ln is the natural logarithm with base e (about 2.718), so ln(e) equals 1. Choosing the wrong one is a frequent source of mistakes, so confirm the base your problem expects.

Does the calculator follow order of operations?

Yes. It evaluates the whole expression using PEMDAS: parentheses, then exponents, then multiplication and division, then addition and subtraction. You can type a full expression with nested parentheses rather than entering numbers strictly left to right.

How do I enter exponents and roots?

Use the power function (often shown as x^y or a caret) for any exponent, for example 2^10 for 2 to the tenth. Use the square root key for square roots, and a power of 1 divided by n for an nth root, such as x^(1/3) for a cube root.

Is my data private when I use this calculator?

Yes. All calculations happen locally in your browser using JavaScript, and nothing you enter is sent to or stored on a server. It works the same way whether you are online or have lost your connection after the page loads.

From our blog

How to Calculate Your Daily Protein Target (and Actually Hit It)

By the Super Simple Digital Tools Team · Updated June 2026

Most people either guess at protein or default to the headline RDA number, and both lead to misses. The honest first step is choosing the right activity level. The 0.8 g/kg Recommended Dietary Allowance is a minimum to prevent deficiency in sedentary adults, not an optimal target for someone who lifts weights three times a week. Being truthful about your real activity, not your aspirational schedule, is what makes the calculator's output trustworthy.

Once you have your target, the next challenge is distribution. A daily figure like 120 grams is easier to reach when spread across the day rather than crammed into dinner. Splitting protein into three or four meals of roughly 25 to 40 grams each keeps muscle protein synthesis stimulated through the day and is far more achievable than a single huge serving. This also explains why breakfast matters: many people under-eat protein in the morning and then cannot catch up by evening.

Translating grams into food is where the plan becomes real. As rough anchors, a chicken breast holds around 30 to 40 grams, a large egg about 6, a cup of Greek yogurt roughly 20, a scoop of protein powder 20 to 25, and a cup of cooked lentils around 18. Knowing a handful of these values lets you assemble meals to your target quickly without weighing every ingredient or logging obsessively.

Plant-based eaters can hit the same numbers but should pay attention to variety. Combining sources such as legumes, soy, grains, nuts, and seeds across the day covers the full range of essential amino acids. Soy, in particular, is a complete protein, and tofu, tempeh, edamame, and lentils make reaching a higher target straightforward without animal products.

Finally, treat your calculated number as a hypothesis to test, not a rule carved in stone. Aim for it consistently for two to four weeks, then judge the results against how you recover, train, and feel. If you are constantly hungry, losing strength, or struggling to recover, nudge intake up within the recommended range. The calculator gives you a credible starting point; your own response over time fine-tunes it.

  • Set the activity level to match your real weekly routine, not your best week, so the target reflects how you actually train.
  • Divide your daily goal into three or four meals of about 25 to 40 grams each rather than backloading protein at dinner.
  • Memorize the protein content of five staples you eat often so you can build meals to your target without constant tracking.
  • Recalculate after a meaningful weight change, since a target tied to body weight drifts as you gain or lose pounds.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.

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