Math, Science & Engineering
A complete collection of scientific and engineering calculation tools for students, educators, professionals, and enthusiasts. From basic unit conversions to advanced physics simulations, financial calculations, and specialized engineering tools. Solve equations, convert measurements, calculate loan payments, simulate physical phenomena, balance chemical equations, design electrical circuits, and estimate construction costs—all with accuracy and ease.
Calculate power factor, real power, reactive power, apparent power, and phase angle for AC circuits from any two known values.
Solve velocity, distance, or time with v = d/t. Supports many units, updates in real time, and shows unit conversions, speed comparisons, and solution steps.
Calculate range, max height, flight time, and impact velocity for projectile motion. Visualize the trajectory and compare up to 3 launches.
Calculate frequency, duty cycle, period, and component values for 555 timer IC circuits in astable and monostable modes.
Calculate capacitance, charge, energy, and reactance for capacitors, plus series and parallel combinations. SI unit prefixes with real-time results and formulas.
Calculate inductance, stored energy, inductive reactance, series/parallel combinations, and LC resonant frequency with quality factor.
Find the right wire gauge for your circuit from current, voltage, run length, and acceptable voltage drop, with AWG and mm² results.
Calculate output voltage for a two-resistor voltage divider, find the resistor needed for a target voltage with E24 suggestions, and analyze load effects.
Calculate Voltage, Current, Resistance, and Power instantly. Enter any 2 values and get the other 2 using Ohm's Law and the Power Wheel.
Decode resistor values from color bands (4, 5, 6-band) or convert resistance values back to color codes instantly.
Estimate how long a battery will last from its capacity, current draw, and circuit efficiency, or find the capacity you need for a target runtime.
Find the right current-limiting resistor for your LED circuit, with the nearest E24 value, color code, power rating, and a live diagram for single, series, or parallel LEDs.