- Fraction Calculator
- Matrix Calculator
- Slope Calculator
- Algebra Calculator
- Trigonometry Calculator
- Percentage Calculator
- Probability Calculator
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Quadratic Axis and Y-Intercept CalculatorFind the y-intercept and x-intercepts of any quadratic y = ax² + bx + c. Computes the discriminant and tells you if real roots exist.
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Geometric Sequence Common Ratio CalculatorFind the common ratio (r) of a geometric sequence by dividing any term by the term before it. Fast, accurate, with worked examples.
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Amplitude, Period & Phase Shift CalculatorFind amplitude, period, phase shift, and vertical shift of y = a·sin(bx − c) + d. Enter a, b, c, d and get all transformations instantly.
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Common Difference CalculatorFind the common difference (d) of an arithmetic sequence from the first term, an n-th term, and its position. Free, instant, with worked steps.
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Find the Missing Endpoint from Midpoint CalculatorFind the missing endpoint of a line segment given one endpoint and the midpoint. Solves x2 = 2xm - x1 and y2 = 2ym - y1 instantly.
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Complete the Sequence Pattern CalculatorFind the next number in a sequence. Detects arithmetic (constant difference) or geometric (constant ratio) patterns and extends them automatically.
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Partial Sum of a Series (Σ) CalculatorCompute the partial sum Σ from i=m to n of common functions f(i): i, i², i³, linear a·i+b, geometric a·rⁱ, and harmonic 1/i.
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Remaining Amount After n Half-Lives CalculatorCalculate how much of a substance remains after a given time using the half-life decay formula N = N₀ · (1/2)^(t/T½). Free, instant, accurate.
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Two-Worker Time Together CalculatorSolve work-rate word problems: if A finishes in a hours and B in b hours, find how long they take working together with t = a·b/(a+b).
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Completing the Square: Circle Equation CalculatorConvert a general circle equation x²+y²+Dx+Ey+F=0 to standard form. Find the center and radius instantly by completing the square.
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Find the nth Term Rule of a Sequence CalculatorFind the nth term of an arithmetic or geometric sequence. Enter your terms, auto-detect the common difference or ratio, and get the nth-term rule.
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Celsius–Fahrenheit Equation SolverConvert between Celsius and Fahrenheit using the exact equation F = 9/5·C + 32 and C = 5/9·(F − 32). Solve either direction instantly.
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Median CalculatorFind the median (middle value) of any list of numbers. Enter values separated by commas or spaces and get the median instantly, with steps.
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Domain of a Rational Function CalculatorFind the domain of a rational function by solving the denominator equal to zero. Supports linear and quadratic denominators with instant excluded values.
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Set Union, Intersection and Difference CalculatorCompute the union, intersection, difference and symmetric difference of two sets. Enter comma-separated elements and get A∪B, A∩B, A−B instantly.
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Mode Calculator (Most Frequent Value)Find the mode of a data set — the value(s) that appear most often. Supports unimodal, bimodal, and multimodal lists, plus no-mode detection.
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Solve for X — Linear Equation CalculatorSolve any linear equation of the form ax + b = cx + d for x. Handles unique solutions, no solution, and infinitely many solutions instantly.
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Sum of First n Terms of an Arithmetic Sequence CalculatorCalculate the sum of the first n terms of an arithmetic sequence from the first term, common difference, and number of terms. Free and instant.
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Pearson Correlation Coefficient (r) CalculatorCompute the Pearson linear correlation coefficient (r) from paired X and Y data. Also returns r-squared, regression slope, intercept and covariance.
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Complex Number Absolute Value (Modulus) CalculatorCompute the absolute value (modulus or magnitude) of a complex number a + bi using |a + bi| = sqrt(a^2 + b^2). Also shows the argument.
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Explicit Formula for an Arithmetic Sequence CalculatorFind the nth term of an arithmetic sequence using the explicit formula aₙ = a₁ + (n−1)·d. Enter the first term, common difference, and term number.
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New Value After Percent Change CalculatorFind the new value after applying a percent increase or decrease to an original number. Enter the old value and percent change to get the result instantly.
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Literal Equation Solver CalculatorSolve literal equations for a chosen variable using inverse operations. Rearrange formulas like A=½bh, d=rt, V=IR and y=mx+b to isolate a variable.
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Divisibility Test CalculatorCheck if a number is divisible by another instantly. Enter n and a divisor (2–11 or any value) to get yes/no, the quotient, and the remainder.
