Free online scientific calculator and math solver
CalcSolver is a free online scientific calculator and math solver for arithmetic, algebra, trigonometry, fractions, powers, roots, and logarithms. Enter an expression, press Enter, and get an answer in your browser. No download or sign-up required.
Press Enter or = to calculate. Use DEG/RAD for trigonometry.
Quick math answers people search for
Common conversions and values, already worked out. Enter an expression in the calculator to check it.
Math tools that show the working
Each tool focuses on one topic and explains the method, so you can understand the process instead of copying an answer.
Advanced Math Workspace
Trigonometry, logarithms, roots, powers, and factorials in one place.
Fraction & Decimal Trainer
Convert between fractions, decimals, and percentages step by step.
Fraction Simplifying Workshop
Reduce fractions to their lowest terms and review each step.
LCM & GCF Finder
Find the least common multiple and greatest common factor.
Prime Number Detective
Check whether a number is prime and explore its factors.
Divisibility Rules Practice
Test divisibility rules for numbers from 2 through 10.
Times Tables Trainer
Practice multiplication tables up to 20.
Place Value Explorer
Break a number into ones, tens, hundreds, and larger place values.
Loan Calculator
Estimate loan payments and explore repayment scenarios.
A math tool for every grade level
Choose a tool that matches the topic you are studying, then move on as the problems become more challenging.
Grades 9–12
Build confidence with algebra, trigonometry, logarithms, and early calculus concepts.
Grades 6–8
Strengthen fraction skills, factors, multiples, decimals, and number sense.
Grades 3–5
Develop number sense, place value, multiplication facts, and divisibility skills.
From expression to answer in three steps
Enter a complete expression, evaluate it, and use a topic tool when you want to see the method.
Enter the expression
Type a complete problem using numbers, operators, parentheses, roots, or functions, for example (25 + √81 − 2) ÷ (3 × 2).
Press Enter or =
The calculator follows the standard order of operations and displays your expression with the result.
Open a step-by-step tool
Use the fraction, LCM, or prime-number tools to explore how a solution is worked out.
Worked math examples you can follow along
Typical homework problems, explained in simple steps. Enter each expression in the calculator to check the answer.
Solve a quadratic equation
- Read off a = 1, b = −5, c = 6.
- Calculate the discriminant: b² − 4ac = 25 − 24 = 1.
- Use the quadratic formula to get x = (5 ± 1) / 2.
Evaluate a trigonometric expression
- Set the calculator to degree mode.
- sin(30°) = 0.5 and cos(60°) = 0.5.
- Add the two values: 0.5 + 0.5.
Simplify a fraction
- Find the greatest common factor of 18 and 24: 6.
- Divide the numerator and denominator by 6.
- 18 ÷ 6 = 3 and 24 ÷ 6 = 4.
Find the LCM and GCF
- Prime factorize: 24 = 2³ × 3 and 36 = 2² × 3².
- GCF uses the lowest powers: 2² × 3 = 12.
- LCM uses the highest powers: 2³ × 3² = 72.
Calculate percentage change
- Subtract: 100 − 80 = 20.
- Divide the difference by the original value: 20 ÷ 80 = 0.25.
- Multiply by 100 to convert to a percentage.
Apply the remainder theorem
- For divisor (x − 2), substitute a = 2 into the polynomial.
- Evaluate P(2) = 2(2³) − 3(2) + 5.
- Calculate 16 − 6 + 5.
Built for students, teachers, and parents
Useful tools and explanations for homework, classroom practice, and learning at home.
Runs in the browser
Calculations run in your browser, so answers appear quickly without waiting for a server response.
History and scratch notes
Keep track of recent calculations and scratch work in your browser. Clear your browser data to remove locally saved items.
Degrees and radians
Switch between degree and radian modes before evaluating trigonometric expressions.
Light and dark themes
Choose a bright layout for classroom use or a darker theme for evening study.
Touch-friendly layout
The calculator and tools are designed to work on phones, tablets, Chromebooks, and desktop screens.
No account required
Open the page and start calculating. No registration or software installation is required.
Who uses CalcSolver
Students
Check homework, explore unfamiliar topics, and verify your answers with worked examples.
Teachers and advisors
Demonstrate calculations, explain formulas, and give students interactive tools for independent practice.
Parents
Refresh your understanding of school maths and use clear examples to help children work through problems.
Quick math formula reference
Choose a topic and review useful formulas for algebra, trigonometry, fractions, geometry, and statistics.
Common fractions, decimals, and percents
A typical US scale. Schools differ, so check your own handbook for the final word.
| Fraction | Decimal | Percent |
|---|---|---|
| 1/2 | 0.5 | 50% |
| 1/3 | 0.3333 | 33.33% |
| 2/3 | 0.6667 | 66.67% |
| 1/4 | 0.25 | 25% |
| 3/4 | 0.75 | 75% |
| 1/5 | 0.2 | 20% |
| 1/8 | 0.125 | 12.5% |
| 7/8 | 0.875 | 87.5% |
Five calculator mistakes to avoid
Many incorrect results come from entering an expression incorrectly or using the wrong mode.
Averaging instead of weighting
Check parentheses and operator order before evaluating a long expression. For example, 6 ÷ 2 × (1 + 2) equals 9 when multiplication and division are evaluated from left to right.
Mixing scales
Use the correct angle mode. sin(90) is 1 in degrees, but not in radians.
Counting pass/fail courses
Remember that −3² equals −9, while (−3)² equals 9. Parentheses change the result.
Rounding too early
Keep full precision until the last line. Rounding each course first can shift the second decimal.
Forgetting repeated courses
Avoid rounding intermediate values too early. Keep precision until the final answer.
Online math solver guide
Explore the functions available in the calculator and learn when each math tool can help.
Scientific calculator functions
Use powers, square and cube roots, logarithms, factorials, and trigonometric functions such as sin, cos, and tan. Parentheses help you group operations and build more complex expressions.
Solve a quadratic equation
A quadratic equation has the form ax² + bx + c = 0. The quadratic formula gives its solutions: x = (−b ± √(b² − 4ac)) / 2a.
Algebra and the Remainder Theorem
Evaluate polynomial expressions and use the Remainder Theorem to find the remainder when a polynomial is divided by a linear expression. For P(x) divided by (x − a), calculate P(a).
Number theory
The percentage change formula is (new value − original value) ÷ original value × 100. For a change from 80 to 100, the increase is 25%.
How it compares with a handheld calculator
| Feature | CalcSolver | Spreadsheet | Hand calculation |
|---|---|---|---|
| Cost | Free | Free or paid | Free |
| Setup time | None | Build formulas | None |
| Credit weighting | Automatic | Manual formulas | Manual |
| Works on a phone | Yes | Limited | Yes |
| Risk of errors | Low | Medium | Higher |
Keyboard shortcuts
| Current grade | Final’s weight | Target | Needed on final |
|---|---|---|---|
| 90% | 30% | 90% | 90.0% |
| 82% | 40% | 85% | 89.5% |
| 78% | 25% | 80% | 86.0% |
| 88% | 20% | 90% | 98.0% |
| 75% | 50% | 80% | 85.0% |
| 70% | 30% | 80% | 100.3333…% (out of reach) |
Frequently asked questions
Latest from the blog
Plain-English explainers, worked examples, and formula guides.
Understanding the Basics of Calculus
Derivatives and integrals explained without the jargon.
The Magic of Prime Numbers & Encryption
Why prime numbers matter in maths and digital security.
The Polynomial Remainder Theorem Made Simple
Use P(a) to find polynomial remainders without long division.
Ready to solve your next problem?
Open the calculator, try a worked example, or choose a tool for the topic you are studying. It is free and nothing needs to be installed.