Math Calculators
Homework, invoices and lab reports all need arithmetic you can trust, yet most calculator sites stop at a bare answer. When the result looks wrong, there is no way to see which step caused it. Switching between several sites for different problems makes the confusion worse.
These math calculators cover everyday arithmetic, PEMDAS, long division, long multiplication, scientific notation and trigonometry in one place. Every tool shows its working, uses exact decimal arithmetic and runs entirely in your browser. Pick the tool that matches your problem below, or read the guide to choosing one. All of them are free and available in five languages.
What Are Math Calculators?
They are online tools built for specific kinds of problems, from adding a shopping list to finding a sine. A general keypad handles most arithmetic, while specialized tools add layouts and rules that a keypad cannot show. Long division, for example, is easier to check when every subtraction is written out. Scientific notation is clearer when all its forms appear side by side.
The collection here was designed as a set, so the tools agree with each other. They share one evaluation engine, one rounding rule and one way of explaining steps. An answer from one tool can be pasted into another without surprises. That consistency matters when a single homework sheet mixes several kinds of problems.
All Math Calculators on Toolkit Wizard
Six calculators are available today, each focused on one job. The short descriptions below explain what each one does and when to open it. Every link opens the tool in your current language.
Every tool supports keyboard input, a Show Steps panel and copy buttons for results. New tools are added to this page as soon as they launch. Each description names the problems that tool handles best.
Everyday Arithmetic Keypad
The math calculator evaluates full expressions with negatives, percentages, powers and square roots. It follows standard precedence and returns exact decimals, so 0.1 + 0.2 shows 0.3. Use it for everyday arithmetic you want to check.
Order of Operations Calculator
The order of operations solver rewrites an expression after each step and labels every rule with PEMDAS or BODMAS. It handles parentheses, square brackets and braces. Use it to settle homework debates and viral puzzles.
Long Division Calculator
The long division tool draws the full bracket layout with every divide, multiply, subtract and bring down step. It gives remainders or decimals and marks repeating digits. Use it to check written division line by line.
Long Multiplication Calculator
The long multiplication tool shows the column method with carries and partial products. It stays exact for numbers up to 30 digits. Use it to check written multiplication or very large products.
Scientific Notation Calculator
The scientific notation converter switches between standard form, scientific, E and engineering notation. It also adds, subtracts, multiplies and divides in that form. Use it for physics, chemistry and astronomy values.
Scientific Calculator
The scientific calculator covers trigonometry, logarithms, factorials, combinations and fractions. It has DEG, RAD and GRAD modes with exact values at special angles. Use it wherever a school scientific model would be needed.
How to Choose the Right Calculator
Start from the question you need answered, not from the numbers. If you need a result with its working, the general keypad or the order of operations tool is usually enough. If your teacher expects a written layout, choose the long division or long multiplication tool. If the numbers have many zeros, go to the notation converter first.
Functions such as sine, logarithms and factorials always belong on the scientific keypad. When one problem needs two tools, solve the first part, copy the result and paste it into the second. Every tool reads the same number formats, so nothing is lost in between.
- Everyday totals, percentages and roots: the general keypad.
- PEMDAS or BODMAS homework with brackets: the order of operations tool.
- Written division or multiplication practice: the long division or long multiplication tool.
- Very large or very small values: the notation converter.
- Trigonometry, logarithms, factorials and fractions: the scientific keypad.
One Problem, Several Tools: Worked Examples
Real problems rarely fit neatly into one category. These examples show which tool to use for each part and what the final answer means.
Each result was produced with the tools linked above. Enter the same inputs to see the full steps.
Splitting a bill with a tip
In the general keypad, enter (84.60 + 15%) ÷ 4 to get 24.3225. The bracket adds a 15% tip to the bill before dividing by four people. Each person pays about 24.32.
Checking a PEMDAS homework answer
In the order of operations tool, enter 7 + 3 × (10 - 4)^2 ÷ 6 to get 25. The steps show the bracket, then the square, then the multiplication and division, then the addition. A student who added first would get a very different answer.
A long division assignment
In the long division tool, divide 7236 by 18 to get 402. The zero in the middle of the quotient appears because 3 is smaller than 18. Multiplying 402 by 18 returns 7236, which confirms the answer.
A long multiplication assignment
In the long multiplication tool, multiply 256 by 48 to get 12288. The partial products are 2048 and 10240. Their sum is the product, with every carry shown.
Comparing the Earth and the Moon
In the notation converter, divide 5.972 × 10^24 by 7.342 × 10^22 to get about 81.3. The Earth has roughly 81 times the mass of the Moon. The exponents 24 and 22 subtract to leave a two-digit result.
The height of a ramp
On the scientific keypad in DEG mode, enter 3 × sin(20) to get about 1.026. A 3 meter ramp at 20 degrees rises just over 1 meter. Using RAD mode by mistake would give a nonsense height.
Choosing pizza toppings
On the scientific keypad, enter 10 nCr 3 to get 120. That is the number of different three-topping pizzas from ten toppings. Order does not matter, so combinations are the right tool.
Scaling a recipe
On the scientific keypad, enter 2/3 × 1 1/2 using the fraction key to get 1. Scaling two thirds of a cup by one and a half gives exactly one cup. The fraction result avoids a rounded decimal like 0.999999.
A gigabyte in bytes
In the general keypad, enter 2^30 to get 1073741824. That is the number of bytes in a gibibyte, the binary unit many operating systems label GB. The data storage converter explains the difference between the two units.
Exact Arithmetic Behind Our Math Calculators
All the tools share an engine written in TypeScript that uses the big.js library for decimal arithmetic. Whole-number layouts such as long multiplication use BigInt, so products stay exact at any length. Functions like sine and logarithm use the platform's IEEE 754 math and are rounded to 12 significant digits.
You can reproduce the same behavior in your own code, as the snippets below show. The key rule is to keep full precision during a calculation and round only when you display the result. That single rule prevents most money and measurement errors. Rounding halfway through a calculation is where small differences start to grow.
import Big from 'big.js';
// Exact decimal steps, rounded only for display
const total = new Big('84.60').times('1.15'); // 97.29
const share = total.div(4); // 24.3225
console.log(share.toFixed(2)); // "24.32"
// Exact whole numbers for long multiplication
console.log(256n * 48n); // 12288nfrom decimal import Decimal, ROUND_HALF_UP
share = Decimal("84.60") * Decimal("1.15") / 4
print(share) # 24.3225
print(share.quantize(Decimal("0.01"), ROUND_HALF_UP)) # 24.32
print(divmod(7236, 18)) # (402, 0)Privacy and Accuracy Across Every Tool
No tool on this page sends your numbers to a server, and none of them require an account. Calculations happen in your browser, and any saved history stays on your own device. You can clear it at any time from the tool where it was created.
Accuracy rules are the same everywhere. Arithmetic uses exact decimals, written methods use exact whole numbers, and endless functions show 12 significant digits. Results that depend on a rounded value are labeled approximate in the steps. If two tools ever disagree, the steps panel shows exactly where.
Error Messages You May See
The tools use the same wording for the same problem, so a message means the same thing wherever it appears. The table lists the messages you are most likely to meet and the fix for each.
None of these messages is a bug. Each one means the input has no real answer as written, or cannot be read.
Message | Where it appears | Fix |
|---|---|---|
| Division by zero is undefined. | All tools that divide | Check the divisor or the bracket that became zero |
| Missing closing parenthesis. | Keypad, order of operations, scientific | Close every opened bracket |
| Invalid expression. Check the numbers and operators. | Keypad and order of operations | Remove trailing operators and extra points |
| Enter a whole number or decimal. | Long division and long multiplication | Use digits, one point and an optional minus |
| Exponent out of range | Notation converter | Keep exponents between -999 and 999 |
| Outside the function's domain. | Scientific keypad | Check logarithm and inverse trigonometry inputs |
Toolkit Wizard Math Tools Compared
The table compares the six tools by input, output and typical use. All of them share keyboard support, exact arithmetic and a Show Steps panel.
Together, these math calculators cover the arithmetic most students, parents and professionals meet in a normal week. Bookmark this page to reach any of them in one click.
Tool | You enter | You get | Best for |
|---|---|---|---|
| Everyday keypad | A full expression | An exact answer with steps | Everyday arithmetic |
| Order of operations | An expression with brackets | The expression rewritten after each step | PEMDAS and BODMAS homework |
| Long division | Dividend and divisor | Written layout, remainder or decimal | Checking written division |
| Long multiplication | Two numbers | Column layout with carries | Checking written multiplication |
| Scientific notation | Any number or two numbers | Scientific, E, engineering and standard forms | Science values |
| Scientific calculator | An expression with functions | Trigonometry, logs, factorials and fractions | School science and math |
Math Tools FAQ
These answers cover questions about the collection as a whole. Each tool page has its own detailed questions as well.
If a question is about one specific method, the linked tool page explains it in full. Those pages also include worked examples for every rule.