Free Online Scientific Calculators
Fast, accurate, browser-based calculators for math, algebra, statistics and geometry — each with the formula and a step-by-step solution.
Scientific Calculator
A full-featured online scientific calculator. Enter an expression and get an exact result — with trigonometry (degrees or radians), logarithms, powers, roots, factorials, constants and memory keys. It works with your keyboard too.
Open the Scientific Calculator →Popular calculators
The tools people reach for most — each with worked steps.
- %Scientific CalculatorA full-featured online scientific calculator. Enter an expression and get an exact result — with trigonometry (degrees or radians), logarithms, powers, roots, factorials, constants and memory keys. It works with your keyboard too.Open calculator→
- %Percentage CalculatorWork out percentages three ways: find a percentage of a number, find what percentage one number is of another, or calculate a percentage increase or decrease. Each answer comes with the steps.Open calculator→
- √Quadratic Equation CalculatorEnter the coefficients a, b and c to solve ax² + bx + c = 0. The calculator uses the quadratic formula, reports the discriminant, and shows the full working — including complex roots when they occur.Open calculator→
- ΣMean CalculatorEnter a list of numbers separated by commas or spaces to find the mean (average). You also get the median, mode, range, sum and count — each with the working shown.Open calculator→
- △Triangle CalculatorEnter the three side lengths to find the area (via Heron’s formula), the perimeter, the semi-perimeter and the triangle type. The calculator also checks that the sides form a valid triangle.Open calculator→
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Five colour-coded collections covering the math you need.
Latest from the blog
Clear guides that explain the method, not just the answer.
How to Find the Area of a Triangle (4 Methods)
From the classic ½ × base × height to Heron's formula for three sides, here are four reliable ways to find the area of any triangle — with examples.
Mean, Median and Mode Explained (With Examples)
The three "averages" — mean, median and mode — what each one measures, how to calculate them, and which to use when your data has outliers.
How to Calculate Percentages Quickly (Without a Calculator)
Mental-math tricks for percentages — the 10% method, the reversal trick, tips, discounts and percentage change — plus when to reach for a calculator.
Calculators that actually explain the math
CalcSolver is a free collection of scientific and academic calculators built for students, teachers and anyone who needs a quick, reliable answer. Unlike a basic calculator that only spits out a number, every CalcSolver tool shows the formula it uses and walks through the step-by-step solution — so you not only get the answer, you understand how to reach it.
Each calculator runs entirely in your browser. That means results are instant, nothing is uploaded, and the tools work just as well on a phone as on a laptop. Start with our scientific calculator for everyday math, or jump into a specific tool like the percentage calculator, quadratic equation solver, mean calculator or triangle calculator.