# Online Calculators

Need to check an answer or do a quick conversion?In this section you will find a calculator for all the popular maths conversions and calculations. You now donâ€™t need to remember mathematics formulae. Just type in your data and the answer will be given to you.

#### Circles

Calculates radius, diameter, circumference, area and the semicircle area#### Cones

Calculates the base radius, perpendicular height, slant length, curved surface area, volume and angle between the base and the slanted side.#### Cubes

Calculates the edge length, space diagonal, surface area and volume.#### Cylinders

Calculates diameter, height, volume, curved surface area and total surface area.#### Ellipses

Calculates the major and minor axes, eccentricity, area, foci distance and loop length#### Equivalent Fractions

This gives a table of fractions and decimals. By looking along each row you can see a line of equivalent fractions for the most common fraction values.#### Fractions

#### Growth and Decay Calculator

This calculator uses the compound and simple interest formulae to calculate future value (FV) of a data value (both growth and decay) given present value (PV), rate of change (i) and the number of periods.#### Length 1

Type in the length, choose the units and this calculator will convert your value to 19 different measures.#### Length 2

The calculator converts between feet and inches, metres, centimetres and millimetres.#### Loan Repayment

This calculator calculates repayments where a sum of money is borrowed at fixed intervals with interest being added at the end of each interest interval. It calculates the instalments so that the last payment matches the final payment owing.#### Mass 1

Type in any mass size and this calculator will convert the value to 17 different measures.#### Mass 2

This calculator converts between pounds and ounces and kilograms, grams and milligrams#### Percentages Calculator

This calculator gives the percentage increase or decrease of two values#### Polygons

When given the number of edges and their lengths, this calculator will give the area and both the in-radius and circum-radius. This page also gives a handy table of polygon names for shapes ranging from 3 to 12 sides.#### Pyramids

This calculator asks for any two values and then gives the base edge, perpendicular height, slant edge, perpendicular height, slant edge length, slant height, volume and the angle between the base and the triangular sides.#### Quadratic Equation Solver

Enter the three values of a quadratic equation and this calculator will give the two roots.#### Right Angled Triangles

This calculator asks for any two values and then gives all three side lengths, all three angles and the area of the triangle.#### Rectangles

This calculator calculates the edge sizes, perimeter diagonal and area of a rectangle.#### Roman Numeral Converter

Type in a figure in Roman Number format or type any number and this calculator will convert.#### Sectors

Calculates the radius, diameter, circumference, surface area and volume of a sphere.#### Spheres

#### Temperature

Converts between Kelvin, Celcius, Fahrenheit, Reaumur, and Rankine .#### Triangles

Calculates all three size lengths, the angles, perimeter, area, in-radius and circumradius.#### Volume

Converts between cubic metres and 18 other popular measures of volume.