Math decisions, connected.

Enter the old and new values to measure an increase or decrease relative to the old value.

Calculate a sale price, discount savings, and the final price after an entered sales-tax rate.

Add sales tax to a price or calculate the tax portion already included in a total using a rate you enter.

Calculate a tip on the pre-tax bill, add sales tax, and split the final total fairly with cent-accurate shares.

Solve equations in the form ax + b = c with clear substitution and verification steps.

Solve ax² + bx + c = 0 using the quadratic formula, discriminant, vertex, and real or complex roots.

Graph a cubic polynomial ax³ + bx² + cx + d over a custom x-range with a live coordinate plot.

Differentiate a cubic polynomial and evaluate its slope at a chosen x-value with the power rule.

Integrate a cubic polynomial exactly between two bounds and show the antiderivative and signed area.

Solve two linear equations in x and y using determinants, with substitution checks for both equations.

Calculate fraction from clearly explained inputs.

Calculate ratio & proportion solver from clearly explained inputs.

Calculate exponent from clearly explained inputs.

Calculate right triangle from clearly explained inputs.

Calculate standard deviation from clearly explained inputs.

Calculate probability from clearly explained inputs.

Calculate combinations from clearly explained inputs.

Calculate a 2×2 matrix determinant, inverse, trace, and product with a second matrix.

Find the real roots of a cubic, quadratic, or linear polynomial from clearly labeled coefficients.

Evaluate the finite limit of a polynomial or polynomial quotient at a chosen x-value.

Integrate a cubic polynomial term by term and evaluate one antiderivative.

Calculate sine, cosine, tangent, reciprocal functions, and radians from an angle in degrees.

Add, subtract, multiply, or divide two complex numbers using an operation code.

Calculate a logarithm in any valid positive base and verify it by exponentiation.

Normalize a number into coefficient and base-10 exponent form.

Find a z-score and cumulative probability for a normally distributed value.

Estimate a mean confidence interval from sample statistics and a selected critical value.

Fit a least-squares line to five clearly paired x and y observations.

Calculate rectangle, triangle, and circle measurements in one labeled geometry workspace.

Evaluate an exponential model from an initial value, rate, and number of periods.

Find arithmetic and geometric nth terms and finite sums.

Enter the percentage and the number it applies to. For example, enter 20 and 250 to find 20% of 250.