*Cubic equation*is equation of the form:

Presented online calculator solves cubic equations using Cardano formulae. However, in special cases (then one or more coefficients are equal to zero, or there is some dependence between coefficients, etc.) more simple solution is used.

Numbers, fractions and even parameters allowed as the coefficients input. The coefficient at
x^{3}
(the leading one) can't be zero. The equation entered into calculator in its natural form. To enter the decimal numbers, use point as the integer and decimal parts separator, for instance 1.45.

Cubic equations solver

Install calculator on your site

Quadratic equation online calculator

Linear equation online calculator