🧮 Math & Science Tools
Sixteen calculators for geometry, algebra, number theory, statistics, chemistry and basic electronics. Every one runs entirely in your browser.
🔲 Matrix Calculator
Add, subtract, multiply, transpose, determinant and inverse for 2×2 and 3×3 matrices.
Open Tool →➡️ Vector Calculator
Dot product, cross product, magnitude and angle between two vectors.
Open Tool →🎨 Resistor Color Code Decoder
Decode 4-band and 5-band resistor color codes into resistance and tolerance.
Open Tool →⚗️ Molar Mass Calculator
Compute the molar mass of any chemical formula, including nested parentheses.
Open Tool →🔢 Permutations & Combinations Calculator
Compute nPr and nCr for large n without factorial overflow.
Open Tool →🧮 Binary & Hex Arithmetic Calculator
Add, subtract and do bitwise operations across binary, octal, decimal and hex.
Open Tool →⭕ Unit Circle Reference
Angle to sine, cosine and tangent, plus a common-angles reference table.
Open Tool →