Free Math Tools
Equations, matrices, statistics, regression, probability, and geometry
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17 tools in this category
Quadratic Equation
ax² + bx + c = 0, discriminant and roots
Open2×2 Linear System
Solve using Cramer's rule
Open3×3 Determinant
Expansion along the first row
Open2×2 Eigenvalues
Characteristic polynomial
OpenCombinatorics
C(n,k), P(n,k), and n!
OpenBayes' Theorem
P(A|B) from prior probabilities
OpenBinomial Distribution
P(X=k) for n trials
OpenZ-Score and Percentiles
Standardization and P(Z ≤ z)
OpenDescriptive Statistics
Mean, median, σ for a sample
OpenLinear Regression
y = a + bx, R² by OLS
OpenConfidence Interval
CI for the mean (t≈z)
OpenTriangle Solver
SSS or SAS — sides and angles
OpenLogarithmic Equation
Find x where bˣ = c
OpenGeometric Series Sum
Sₙ given a₁, r, and n
OpenProbability AND / OR
Independent and mutually exclusive events
Open3D Distance
Between points (x,y,z)
OpenPercentage Calculator
Find X% of Y, what percent X is of Y, and percentage change
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