Math and Statistics

  • Sales Tax Amount Calculator
    Calculate the sales tax amount and total price from any price and tax rate. Enter the pre-tax price and percentage to see tax owed instantly.
  • Find X and Y Intercepts of a Line
    Find the x-intercept and y-intercept of a line in standard form Ax + By = C. Enter A, B, and C to get both intercepts and the slope instantly.
  • Gross Profit Percentage Calculator
    Calculate gross profit percentage (margin) from revenue and cost of goods sold. Instantly see gross profit and margin % with this free calculator.
  • Margin on Selling Price Calculator
    Calculate gross margin as a percentage of selling price from cost and sale price. Also shows gross profit and markup on cost. Free and instant.
  • Nature of Roots Calculator
    Find the discriminant of a quadratic equation and determine the nature of its roots — two real, one repeated, or two complex conjugate roots.
  • Slope-Intercept from Standard Form Calculator
    Convert a linear equation Ax + By = C into slope-intercept form y = mx + b. Instantly find the slope m = -A/B and y-intercept b = C/B.
  • Discount Percentage Calculator
    Find the discount percentage between a regular price and a sale price. Enter both prices to instantly see the percent off and how much you save.
  • Quadratic Factoring Calculator
    Factor any quadratic ax²+bx+c into binomial form a(x−r₁)(x−r₂). Enter a, b, c to get the roots, discriminant, and factored expression instantly.
  • Equivalent Ratios Calculator
    Generate equivalent ratios by scaling a:b with a multiplier, and check if two ratios a:b and c:d are equal using cross multiplication.
  • X and Y Intercepts of a Line Calculator
    Find the x-intercept and y-intercept of a line from its equation ax + by + c = 0. Enter coefficients a, b, c to get both intercepts instantly.
  • Percentage of Income Spent on Rent Calculator
    Find out what percentage of your monthly income goes to rent. Enter your rent and income to check affordability against the 30% rule.
  • Percent of Salary Calculator
    Calculate what a given percentage of your salary equals. Enter your salary and a percent to instantly find the dollar amount and the remainder.
  • Tip Amount From Percentage Calculator
    Calculate the tip amount from any percentage, see your total bill, and split it evenly between people. Fast, free gratuity calculator for any currency.
  • Loan-to-Value (LTV) Percentage Calculator
    Calculate your loan-to-value (LTV) ratio instantly. Enter your loan amount and property value to find the LTV percentage and your home equity.
  • Percent Grade (Slope) Calculator
    Calculate percent grade and slope from two points. Enter X/Y coordinates to get rise/run, slope ratio, grade percentage, and angle of incline.
  • Solve Quadratic by Factoring Calculator
    Solve any quadratic equation ax²+bx+c=0 by factoring. Get both roots, the discriminant, and step-by-step factor logic instantly.
  • Part of a Whole Calculator
    Find the part, whole, or percent in any part-of-a-whole problem. Solve part = percent/100 × whole instantly with this free percentage ratio calculator.
  • Percent Proportion Calculator
    Solve percent word problems with the proportion part/whole = percent/100. Find the missing part, whole, or percent instantly with full steps.
  • Markup & Markdown Calculator
    Calculate the final price after a percent markup or markdown. Enter an original price and percentage to see the new price and the dollar change instantly.
  • Profit Margin and Markup Calculator
    Calculate profit margin, markup percentage, and gross profit from cost and selling price. Free, instant business pricing calculator for any currency.
  • Evaluate an Algebraic Expression Calculator
    Evaluate the algebraic expression a·x² + b·x + c·y + d by substituting your values for x and y. See each term and the simplified result instantly.
  • How Much Is X Percent Off Calculator
    Find out how much you save and what you pay when an item is X percent off. Enter the price and discount percent for instant savings and final price.
  • What Percentage Did I Tip?
    Find out what percentage you tipped. Enter your bill and tip amount to instantly calculate the tip percentage and total paid.
  • Solve for x: Variables on Both Sides Calculator
    Solve linear equations of the form ax + b = cx + d. Enter the coefficients and constants to find x instantly, with full steps shown.

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