Scientific Calculator
This scientific calculator evaluates arithmetic expressions exactly in the order most people expect from a real calculator. Use it to solve one-line math problems with parentheses, decimals, negatives, division, and percentages, whether you are checking homework, comparing discounts, splitting bills, or verifying a quick budget number. It is best for practical expression math such as `(18.5 + 7) / 5`, `240 * 7.5%`, or `89.99 * (1 - 25%)`. This version does not include trigonometry, exponents, logs, or graphing, so the page stays focused on the everyday expression searches people usually need solved fast.
Quick answer
The calculator follows normal order of operations. Parentheses are handled first, then multiplication and division, then addition and subtraction.
What this tells you
- •The calculator follows normal order of operations. Parentheses are handled first, then multiplication and division, then addition and subtraction.
- •Percent signs are treated as dividing that value by 100. For example, `7.5%` becomes `0.075` during the calculation.
- •You can type negative numbers and decimals, such as `-4.2 + 9.8 / 2`.
- •Use explicit operators only. Type `*` for multiplication and `/` for division, not `x`, `÷`, or implied multiplication.
- •Results are rounded to 10 decimal places, which is usually enough for schoolwork and quick checking.
How to Use
- 1Enter the full expression in one line, using only numbers, decimal points, spaces, parentheses, `+`, `-`, `*`, `/`, and `%`.
- 2Use parentheses whenever you need a specific grouping. `12 + 3 * 4` gives 24, while `(12 + 3) * 4` gives 60.
- 3Write percentages as part of the expression. For 15 percent of 80, enter `80 * 15%`. For 15 percent off, enter `80 * (1 - 15%)`.
- 4Type multiplication explicitly. Enter `2 * (3 + 4)` rather than `2(3 + 4)`.
- 5Press Calculate, then compare the output with your expected setup before using it in a class assignment, invoice, or purchase decision.
How It Works
Formula
Parentheses first
Then multiplication and division from left to right
Then addition and subtraction from left to right
Percent means divide by 100
Example: 80 + 80 * 15% = 92The calculator checks that the expression contains only supported arithmetic characters, then evaluates it using standard precedence. Each percent sign is converted to `/100`, so `15%` becomes `0.15`. That is why `240 * 7.5%` returns `18`. It also means percent works best when you write the full relationship yourself, such as `price * (1 + tax%)` or `price * (1 - discount%)`.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Order of operations without parentheses
Multiplication happens before addition, so the calculator solves `3 * 4 = 12` first, then adds the remaining 12 to get 24.
Same numbers with grouping
Parentheses force the addition first. `12 + 3` becomes 15, and `15 * 4` gives 60. This is a good reminder that grouping changes the answer.
Find 7.5 percent of 240
The percent is read as `0.075`. Multiplying `240 * 0.075` gives 18, which is the same as finding 7.5 percent of 240 by hand.
Apply a 25 percent discount and 8.25 percent tax
The discount is applied first, turning $89.99 into $67.4925. Then sales tax is added by multiplying by `1.0825`, which produces a final total of $73.06063125 before any store-specific cash rounding.
Split a dinner bill evenly
Add the meal, tax, and tip first to get 67.2. Dividing by 3 gives 22.4, so each person owes $22.40.
Useful Input Patterns
These are common ways people write practical calculator searches as one expression.
| Task | What to enter |
|---|---|
| 25 percent of 80 | 80 * 25% |
| Add 8 percent tax to 54 | 54 * (1 + 8%) |
| Take 30 percent off 120 | 120 * (1 - 30%) |
| Average three numbers | (14 + 18 + 21) / 3 |
| Group part of a longer expression | 9 + (6 - 2) * 5 |
If an expression needs multiplication, type the `*` symbol. The calculator does not infer multiplication from adjacent numbers and parentheses.
What This Scientific Calculator Does Well
Most people who search for a scientific calculator online are not trying to graph functions or evaluate trigonometry on the spot. They usually want a fast place to check arithmetic that has a few more moving parts than a basic two-number calculator can handle. That includes percentage chains, grouped expressions, decimals, negative values, and quick what-if math for shopping, school, or office work. This page is designed for that narrower job.
The biggest thing to remember is that the calculator only reads what you type. If you mean ten percent more than 20, type `20 * (1 + 10%)`, not `20 + 10%`. The second expression adds 0.1 to 20 because 10 percent is converted to 0.1. Writing the full relationship makes the result match the real question you are asking.
Common mistakes
- Typing `x` or `÷` instead of `*` or `/`. This tool accepts keyboard-style arithmetic operators only.
- Leaving out multiplication before parentheses or percentages. `2(3 + 4)` and `80 15%` are not valid expressions here.
- Assuming `20 + 10%` means ten percent more than 20. It actually means `20 + 0.1`. To increase 20 by ten percent, enter `20 * (1 + 10%)`.
- Forgetting a closing parenthesis, which changes the grouping or causes the expression to fail.
- Dividing by zero somewhere inside the expression, which makes the result undefined.
- Expecting functions such as `sin`, `cos`, `log`, `sqrt`, or `^` exponent syntax that this calculator does not support.
Limitations
This calculator handles core arithmetic expressions only. It does not support trigonometric functions, square roots, exponents, logarithms, variables, units, or symbolic algebra. Percent is interpreted strictly as divide by 100, and results are rounded to 10 decimal places. Because it evaluates the exact expression you enter, unclear intent is never guessed or corrected automatically.
Embed this calculator on your site
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