Free online scientific calculator and math solver
CalcSolver handles algebra, trigonometry, logarithms, fractions, and remainder-theorem problems in your browser. Type an expression, press Enter, get the answer. No download, no sign-up, and it runs on phones, tablets, and Chromebooks.
Quick answers people search for
Common conversions and values, already worked out. Type any of them into the calculator to check.
Math tools that show the working
Each tool does one job and lays out the steps, so you can check your own method instead of copying an answer.
Advanced Math Workspace
Trig, logs, roots, powers, and factorials in one place.
Fraction & Decimal Trainer
Convert between fractions and decimals, step by step.
Fraction Simplifying Workshop
Reduce any fraction to lowest terms.
LCM & GCF Finder
Least common multiple and greatest common factor.
Prime Number Detective
Test for primes and list every factor.
Divisibility Rules Practice
Check numbers against the rules for 2 to 10.
Times Tables Trainer
Build, print, and practice tables up to 20.
Place Value Explorer
Split a number into ones, tens, hundreds, and up.
Loan Calculator (LoanRexApp)
EMI and payoff savings for school and college loans.
A learning path for every grade level
Start with the tools that match where you are, then move on as the topics get harder.
Grades 3–5
Build number sense and fast recall before fractions arrive.
Grades 6–8
Fractions, factors, and multiples, where most students first get stuck.
Grades 9–12
Algebra, trigonometry, logarithms, and early calculus.
From expression to answer in three steps
Paste a whole problem; you don’t need to break it into pieces first.
Enter the expression
Use the keypad or keyboard, for example (25 + √81 − 2) ÷ (3 × 2).
Press Enter or =
The calculator applies PEMDAS/BODMAS and shows your full input above the result, so typos stand out.
Open a tool for the steps
Fractions, LCM, and primes each have a page that walks through the method.
Worked examples you can follow along
Five typical homework problems, solved step by step. Copy each one into the calculator to confirm the result.
Solve a quadratic equation
- Read off a = 1, b = −5, c = 6.
- Discriminant: b² − 4ac = 25 − 24 = 1.
- x = (5 ± √1) / 2, which gives 3 and 2.
Evaluate a trig expression
- Check the calculator is in degree mode.
- sin(30°) = 0.5 and cos(60°) = 0.5.
- Add the two values.
Simplify a fraction
- List the factors: 18 = 2 × 3², 24 = 2³ × 3.
- The GCF is 2 × 3 = 6.
- Divide top and bottom by 6.
Find the LCM and GCF
- 24 = 2³ × 3 and 36 = 2² × 3².
- GCF takes the lowest powers: 2² × 3 = 12.
- LCM takes the highest powers: 2³ × 3² = 72.
Percentage change
- Subtract: 100 − 80 = 20.
- Divide by the old value: 20 / 80 = 0.25.
- Multiply by 100.
Remainder Theorem
- The divisor is (x − 2), so a = 2.
- Substitute: 2(8) − 3(2) + 5.
- Compute 16 − 6 + 5.
Built for students, teachers, and parents
The choices that matter in a classroom or at the kitchen table.
Runs in the browser
Calculations happen on your device, so results appear without waiting on a server, even on slow school Wi-Fi.
History and scratch notes
Past results and notes are saved in your browser’s local storage. Clear your browser data and they’re gone.
Degrees and radians
Switch modes before a trig problem. Leaving radian mode on during a degree question is an easy way to get a wrong answer.
Light and dark themes
A bright layout for projectors, a darker one for evening homework.
Touch-friendly keypad
Large keys and a layout that holds up on a phone as well as a desktop monitor.
No account required
Open the page and start. There’s nothing to register for or install.
Who uses CalcSolver
Students
Check homework answers, see why a fraction simplifies the way it does, and practice facts before a quiz. The step layouts are meant to be read, not skipped.
Teachers
Project the calculator in class, assign a single tool for practice, or point to the formula reference so students stop asking for the quadratic formula mid-test.
Parents
Brush up on methods you haven’t used in years. Worked examples show the reasoning in plain language, which helps when you’re explaining it back.
Quick math formula reference
Pick a topic. Every formula here can be typed straight into the calculator.
Common fractions, decimals, and percents
Worth memorizing; the rest you can get by typing a division.
| 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% |
| 1/6 | 0.1667 | 16.67% |
| 5/6 | 0.8333 | 83.33% |
| 1/8 | 0.125 | 12.5% |
| 3/8 | 0.375 | 37.5% |
| 5/8 | 0.625 | 62.5% |
| 7/8 | 0.875 | 87.5% |
| 1/10 | 0.1 | 10% |
Five calculator mistakes to avoid
Most wrong answers come from input, not from the math.
Wrong angle mode
sin(90) is 1 in degrees but about 0.894 in radians. Check DEG or RAD before every trig problem.
Order of operations
6 ÷ 2 × (1 + 2) equals 9, because division and multiplication run left to right. Add parentheses when you mean something else.
Negative numbers and powers
−3² is −9, while (−3)² is 9. Brackets decide which one you get.
Rounding too early
Keep full precision until the final line. Rounding a middle step can shift the last digits.
Unmatched parentheses
Every opening bracket needs a closing one. If you get an input error, count them.
Online math calcsolver guide
What the calculator covers and where it’s most useful.
Scientific calculator functions
CalcSolver covers powers, square and cube roots, base-10 and natural logarithms, ex, factorials, and the trig family: sin, cos, tan, their inverses, and csc, sec, and cot. Parentheses nest as deep as you need.
Fractions, decimals, and percents
Typing 6/7 gives 0.8571, or 85.71%. Typing 7/8 gives 0.875, or 87.5%. For more than a quick conversion, the Fraction & Decimal Trainer shows each stage.
Algebra and the Remainder Theorem
Dividing 2x³ − 3x + 5 by (x − 2) leaves P(2) = 16 − 6 + 5 = 15. Skipping long division saves several minutes on a test. The full walkthrough covers harder cases.
Number theory
The LCM of 12 and 18 is 36 and their GCF is 6. Both come from prime factorization, which the LCM & GCF Finder lays out line by line.
How it compares with a handheld calculator
| Feature | CalcSolver | Handheld graphing calculator | Phone calculator |
|---|---|---|---|
| Cost | Free | Often $100 or more | Free |
| Scientific functions | Yes | Yes | Often limited |
| Step-by-step tools | Yes | Limited | No |
| Install needed | No | Hardware | Pre-installed |
Keyboard shortcuts
| Action | Key | Example |
|---|---|---|
| Evaluate | Enter or = | 15 + 85 / 5 → 32 |
| Clear | Esc | Resets to 0 |
| Power | ^ | 2 ^ 8 → 256 |
| Delete last | Backspace | Removes one character |
Frequently asked questions
Yes. Every calculator and math tool is free, with no account or subscription.
Use the DEG/RAD toggle on the keypad. In degree mode sin(90) is 1; in radian mode you enter sin(π/2) to get 1.
Type the fraction as a division, such as 6/7, to get 0.8571, which is 85.71%.
Latest from the blog
Plain-English explainers and formula guides.
Ready to solve your next problem?
Open the calculator, try a worked example, or pick a tool for the topic you’re studying. It’s free and there’s nothing to install.