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Percentage
Find a percentage of a number. Enter the number and percent to see the result, formula and calculation steps.
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522 calculators. Clear formulas, useful answers, and every step explained.
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Mathematics
Triangle area
Explore the area of a triangle, step by step.
Open calculatorFinance
Compound interest
Calculate compound growth from an initial amount, annual interest rate and time. See the formula and a worked example.
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Simple interest
Calculate interest on a fixed principal.
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Circle area
Find the area enclosed by a circle.
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Speed & distance
Calculate average speed from distance and time.
Open calculatorEngineering
Ohm’s law
Find voltage from current and resistance.
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Concrete volume
Estimate the volume of a rectangular slab.
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Weighted average
Combine two values with their relative weights.
Open calculatorEveryday
Discount calculator
Find the final price after a discount.
Open calculatorConversions
Metres to feet converter
Convert metres to feet using the exact conversion factor of 0.3048 metres per foot. See the formula and worked steps.
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Temperature converter
Convert Celsius to Fahrenheit. Enter the temperature in degrees Celsius and see the conversion formula, result and worked steps.
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Fraction to decimal
Turn a rational number into its decimal value.
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Square root
Find the principal square root of a non-negative number.
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Powers & exponents
Evaluate integer powers, including negative exponents.
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Linear polynomial
Substitute a value into a linear polynomial.
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Zero of a linear polynomial
Find the x-value at which a linear polynomial is zero.
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Square of a sum
Watch a familiar algebraic identity become a number.
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Difference of squares
Evaluate a difference using its factorized form.
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Arithmetic progression
Find any term of a sequence with a constant difference.
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Geometric progression
Find a term in a sequence with a constant ratio.
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Probability
Find the probability of an event with equally likely outcomes.
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Heron’s formula
Find a triangle’s area using its three sides.
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Rectangle area
Calculate the area of a rectangle from its length and width. See the multiplication formula, input units and a worked example.
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Rectangle perimeter
Find the total length around a rectangle.
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Parallelogram area
Measure the area of a parallelogram.
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Circle circumference
Calculate the circumference of a circle from its radius. See the formula using pi, input units and a worked example.
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Sector area
Find the area of a circular sector from its angle.
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Arc length
Find the length along a circular arc.
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Distance between two points
Measure the straight-line distance on a coordinate plane.
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Midpoint of a segment
Find both coordinates halfway between two points.
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Supplementary angle
Find the other angle in a linear pair.
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Third angle of a triangle
Find a triangle’s missing interior angle.
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Fourth angle of a quadrilateral
Complete the interior angles of a convex quadrilateral.
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Circle chord length
Find a chord’s length from its distance to the centre.
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Cylinder volume
Find the volume of a right circular cylinder.
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Cylinder total surface area
Find the curved surface and both circular ends together.
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Cone volume
Find the volume of a right circular cone.
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Sphere volume
Find the volume enclosed by a sphere.
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Cuboid volume
Find the volume of a rectangular solid.
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Arithmetic mean
Calculate the arithmetic mean of a list of numbers. See the sum, number of observations and division steps.
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Median
Find the middle of an ordered ungrouped data set.
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Data range
Measure the spread between the smallest and largest values.
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Add two fractions
Solve add two fractions with your values and follow each calculation step.
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HCF / greatest common divisor
Solve hcf / greatest common divisor with your values and follow each calculation step.
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Lowest common multiple
Solve lowest common multiple with your values and follow each calculation step.
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Square of a difference
Solve square of a difference with your values and follow each calculation step.
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Cube of a sum
Solve cube of a sum with your values and follow each calculation step.
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