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  • Cumulative GPA Calculator
    Enter current GPA and total credits, then add the GPA and credits for new courses to update your cumulative GPA and see how it changes.
  • Isosceles Triangle Height Calculator
    Compute the height of an isosceles triangle from base length and equal side length. Enter base and side to get h instantly using the standard formula.
  • Isosceles Triangle Perimeter Calculator
    Calculate the perimeter of an isosceles triangle. Enter the lengths of the two equal sides (a) and the base (b) to get P = 2a + b.
  • Sphere Diameter Calculator
    Enter a sphere’s radius to instantly compute its diameter (d = 2r). Fast, accurate tool for geometry tasks, homework, and quick checks.
  • Sphere Surface Area Calculator
    Compute the surface area of a sphere from its radius. Enter a radius to get A = 4πr² with instant results in square units.
  • Hypotenuse Calculator
    Compute the hypotenuse of a right triangle from side A and side B. Enter the two legs to get the length of the longest side instantly.
  • Reverse FOIL Calculator
    Enter coefficients a, b, and c of ax²+bx+c to factor the quadratic by reverse FOIL and get the original binomial factors, when they exist.
  • LCD Calculator
    Find the least common denominator for multiple fractions. Enter fractions, mixed numbers, or integers separated by commas to get the LCD.
  • Hex Calculator
    Enter two hexadecimal numbers, choose add, subtract, multiply, or divide, and see the result instantly in hex for quick, accurate calculations.
  • Rule of 72 Calculator
    Enter an annual interest or growth rate to see how many years it may take for an investment to double using the Rule of 72.
  • Kinetic Energy Calculator
    Calculate kinetic energy fast: enter mass (kg) and velocity (m/s) to get energy in joules (J). Ideal for physics problems, labs, and quick checks.
  • Hourly to Yearly Salary Calculator
    Convert hourly wage to annual pay using your hourly rate, hours per week, and weeks per year. See annual, monthly, bi-weekly, weekly, and daily totals.
  • Proportion Calculator
    Enter any three of A, B, C, and D to complete A:B = C:D and instantly calculate the missing term. Fast, accurate proportion results.
  • P-Value Calculator from Chi-Square
    Enter a chi-square statistic and degrees of freedom to compute the p-value, check significance, and view critical values at 0.05, 0.01, and 0.001.
  • RMR Calculator
    Enter age, gender, weight (kg), and height (cm) to calculate your Resting Metabolic Rate and see calories burned at rest per day.
  • Growth Rate Calculator
    Enter initial value, final value, and years to get compound annual growth rate (CAGR), annual and total growth, percent change, and time to double.
  • NPV Calculator
    Enter an initial investment, discount rate, and a series of cash flows to calculate net present value (NPV) and evaluate project returns.
  • Permutations Calculator
    Enter the total items n and items to arrange r to compute permutations (nPr) and get the number of ordered arrangements instantly, ideal for combinatorics.
  • SAT Score Calculator
    Enter Math, Reading, and Writing scores to calculate your SAT total and the average per section in seconds for the three-section format.
  • Hex to Decimal Converter
    Enter a hexadecimal number to get its decimal value and see the binary equivalent. Fast hex-to-decimal conversion for math, coding, and data tasks.
  • Vector Magnitude Calculator
    Calculate a vector’s magnitude from its components. Select 2D–5D, enter X, Y, and optional Z, W, V, and get the length instantly.
  • Exponential Decay Calculator
    Calculate remaining amount over time from initial value, decay rate (%), and time using N(t)=N0(1−r)^t. Great for modeling decay or depreciation.
  • Covariance Calculator
    Enter two comma-separated lists of X and Y values to calculate sample covariance (n-1). Get the covariance value to see how the variables move together.
  • Percentage Growth Calculator
    Enter initial and final values to calculate percent change using (final - initial)/initial * 100 and see how much it increased or decreased.
  • Etsy Profit Calculator
    Enter item price, material, labor, shipping, Etsy transaction and payment processing rates, and listing fee to see costs, fees, profit, and margin.

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