SolverCalc tool directory
All Calculators
Find the right online calculator for your question. Browse math solvers, converters, data tools, grade calculators and financial calculators by subject.
Each listing identifies the task a tool handles, so you can choose by the numbers you have and the result you need.
Working with a general numerical expression?
Open the scientific calculatorKnow the tool name? Use your browser’s Find on page command to locate it in this directory.
Algebra & Equations
Choose an equation tool by its supported form, or work with expressions and coordinate points.
- Equation SolverSolve a linear equation in x, including parentheses and variables on both sides.
- Quadratic Formula CalculatorEnter a, b and c to find a quadratic’s roots and discriminant.
- System of Equations SolverFind x and y in a system of two linear equations.
- Simplify CalculatorExpand expressions through degree two and combine like terms in x.
- Factoring CalculatorFactor quadratics over the integers, including taking out a common factor.
- Exponent CalculatorEvaluate a power or find an nth root within the tool’s real-number limits.
- Logarithm CalculatorCalculate a logarithm using a chosen base, natural log or change of base.
- Slope CalculatorUse two coordinate points to find a line’s slope, rise and run.
- Distance Formula CalculatorFind the straight-line distance between two points on a coordinate plane.
- Midpoint CalculatorLocate the point halfway between the endpoints of a line segment.
Fractions & Ratios
Use an operation tool for two fractions, a simplifier for one fraction, or a converter to change its representation.
- Fraction CalculatorAdd, subtract, multiply or divide fractions; view simplified, mixed-number and decimal results.
- Simplify Fraction CalculatorReduce a fraction to lowest terms using its numerator and denominator.
- Decimal to Fraction CalculatorConvert a terminating or repeating decimal into a fraction in lowest terms.
- Fraction to Decimal ConverterDivide a fraction’s numerator by its denominator and identify a terminating or repeating decimal.
- Fraction to Percent ConverterExpress a fraction as a percentage and see the corresponding decimal.
- Ratio CalculatorSimplify a two-part ratio and scale it into equivalent ratios.
Decimals & Percentages
Distinguish a percentage of an amount from a percentage change between an original and a new value.
- Percent CalculatorSwitch between percent-of, what-percent and percentage-change calculations in one tool.
- Percent of a Number CalculatorEnter a percentage and a total to find the specified part and remaining amount.
- Percentage Change CalculatorCompare an original value with a new value to calculate relative increase or decrease.
- Decimal to Percent CalculatorConvert a decimal into a percentage, or change a percentage back to a decimal.
Number Theory & Scientific Notation
Find relationships between whole numbers or rewrite very large and very small values in a compact form.
- GCD and LCM CalculatorFind two numbers’ greatest common divisor (GCF/HCF) and least common multiple.
- Prime Factorization CalculatorBreak a whole number into prime factors using successive division.
- Scientific Notation CalculatorConvert between decimal notation and a coefficient multiplied by a power of ten.
Geometry & Trigonometry
Match the shape and the measurements supplied. Use a right-triangle tool only when the triangle has a 90-degree angle.
Triangles, sides & angles
- Pythagorean Theorem CalculatorFind a missing side of a right triangle when two side lengths are known.
- Right Triangle CalculatorSolve a right triangle’s sides, acute angles and area from supported measurements.
- Triangle Area CalculatorFind area from base and height, three sides, or two sides and their included angle.
- Law of Sines CalculatorSolve AAS, ASA or SSA triangle cases, including the ambiguous SSA case.
- Law of Cosines CalculatorFind a side from SAS measurements or an angle from three known sides.
Circles, arcs & sectors
- Circle CalculatorFind radius, diameter, circumference and area from one known circle measurement.
- Arc Length CalculatorCalculate a circular arc or sector from its radius and central angle.
Volume & surface area of solids
- Rectangular Prism CalculatorUse a box’s length, width and height to find volume and surface area.
- Cylinder CalculatorCalculate a right circular cylinder’s volume and surface area from radius and height.
- Cone CalculatorWork with a right circular cone using radius, height or slant height.
- Pyramid CalculatorFind pyramid volume from base area and perpendicular height; explore supported base shapes.
- Frustum CalculatorCalculate a truncated cone or a square frustum using the selected shape’s dimensions.
- Sphere CalculatorFind a sphere’s volume and surface area from its radius or diameter.
- Hemisphere CalculatorCalculate volume, curved surface and total surface for half of a sphere.
- Spherical Cap CalculatorWork out the volume and surface of a cap cut from a sphere.
- Spherical Zone CalculatorCalculate the band of a sphere between two parallel cutting planes.
Measurement & Unit Converters
Select the quantity being measured and the exact source and destination units, including the gallon system where relevant.
Statistics & Data
Choose a dataset summary, a weighted calculation or a standardized-score tool according to the information you have.
- Mean, Median & Mode CalculatorSummarize a list of numbers with central values, range, count and sum.
- Standard Deviation CalculatorMeasure data spread with sample or population standard deviation and variance.
- Weighted Average CalculatorCalculate a mean when values carry different weights rather than equal importance.
- Z-Score CalculatorExpress a score’s distance from a given mean in standard-deviation units.
- Percentile CalculatorConvert between z-scores and percentiles under the standard normal model.
Grades & Study
Use your course’s assessment weights or your institution’s grade-point scale; these tools do not replace official academic records.
Financial Calculators
Explore payment and interest estimates using stated assumptions. Results are calculations, not lender quotes or financial advice.
- Loan CalculatorEstimate an amortized loan’s monthly payment, total repayment and total interest.
- Auto Loan CalculatorEstimate a car payment from price, down payment, trade-in, rate and term.
- Mortgage CalculatorEstimate fixed-rate principal and interest; this is not an all-in housing-cost quote.
- Simple Interest CalculatorCalculate interest on a principal using an annual rate and a duration.
- Compound Interest CalculatorExplore growth of a principal with periodic or continuous compounding.