Math & physics
Percentages, fractions, equations, geometry, physics formulas
Subtopics
Percentages
1 tools
Fractions & proportions
1 tools
Equations
1 tools
Geometry
1 tools
Trigonometry
1 tools
Logarithms & powers
1 tools
Combinatorics
1 tools
Probability
1 tools
Statistics
1 tools
Matrices
1 tools
Derivatives & integrals
1 tools
Unit converters
1 tools
Physics: motion
1 tools
Physics: electricity
1 tools
Physics: heat
1 tools
Rounding & precision
1 tools
Financial math
2 tools
Measurement errors
1 tools
School cheatsheet
1 tools
Formula reference
1 tools
Calculators
Percentage calculator
Percent — Calculators
Fractions + steps
Fraction operations step by step: LCD, reducing, mixed numbers
Quadratic equation
ax² + bx + c → discriminant, roots and step-by-step solution.
Triangle solver
Three sides → angles, Heron's area, perimeter.
Trigonometry
Right triangle from two values + sin/cos/tan table
Powers & logarithms
aᵇ, roots, log_b(x), ln, lg — with explanations.
Combinatorics
n and k → permutations, arrangements, combinations with formulas.
Binomial probability
n trials and p → P(exactly k), P(≤k), P(≥k), expectation.
Descriptive statistics
Number list → mean, median, mode, σ, quartiles.
2×2 matrices
Determinant, inverse, transpose, sum and product of 2×2
Derivatives/integrals
Derivative and integral tables, differentiation rules
Unit converter
Units — Calculators
Kinematics
v₀, a, t → velocity, distance, free fall.
Ohm's law
Any 2 of U, I, R, P → the rest. The formula wheel.
Heat Q=cmΔT
Heating energy by specific heat + mixture temperature
Rounding
To decimals and sig figs: standard, banker's, truncation
Compound interest
Compound — Calculators
Date calculator
Dates — Calculators
Errors
Absolute and relative error, propagation in sum/product/quotient
Formula cheatsheet
Core algebra, geometry, trig and physics formulas — printable
Formula glossary
Discriminant, factorial, derivative, integral — terms explained