Science & Maths

Quadratic Equation Solver

Solve ax squared plus bx plus c equals zero from the coefficients a, b, c: get the discriminant, its sign, and the real or complex roots instantly.

Science & Maths

Periodic Table Lookup

Look up any of the 118 chemical elements by symbol, name, or atomic number: atomic mass, group, period, electron configuration, and category.

Science & Maths

Scientific Constants Reference

Search and browse over 20 fundamental physical constants with their exact CODATA value, SI unit, uncertainty, and a short description.

Science & Maths

Significant Figures Calculator

Count the significant figures in any number and round the result of an addition, subtraction, multiplication, or division to the correct number of significant figures.

Science & Maths

Physics Unit Converter

Convert specialised physics units: energy (J, kcal, kWh, eV, BTU), pressure (bar, atm, psi, mmHg), force, power (hp vs CV), magnetic field, frequency, and electric charge.

Science & Maths

Roman Numeral Converter

Convert whole numbers between 1 and 3999 to roman numerals and back, with live validation that flags non-standard notation such as IIII or VX.

Science & Maths

Matrix Calculator

Calculate the determinant, inverse, transpose, sum, difference, or product of 2x2 and 3x3 matrices directly in your browser, with a clear message when a matrix cannot be inverted.