Science & Engineering
Tools for physics, chemistry, electrical engineering, and scientific computation.
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Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's Law (V = I × R). Enter any two values to find the others.
Voltage Drop Calculator
Calculate voltage drop in electrical wiring based on wire gauge, length, current, and material. Ensure your circuits meet NEC recommendations.
Force Calculator (F=ma)
Calculate force, mass, or acceleration using Newton's Second Law (F = ma). Includes unit conversions to pounds-force and dynes.
Density Calculator
Calculate density, mass, or volume using the formula ρ = m/V. Includes a reference table of common material densities.
Molar Mass Calculator
Calculate molar mass, convert between grams and moles, and find the number of molecules for elements and common compounds.
Wavelength & Frequency Calculator
Convert between wavelength and frequency. Calculate photon energy and identify the electromagnetic spectrum band.
Resistor Color Code Calculator
Decode resistor color bands to find resistance value, tolerance range, and minimum/maximum resistance. Includes color code reference table.
pH Calculator
Calculate pH, pOH, hydrogen ion concentration, and hydroxide concentration. Determine if a solution is acidic, neutral, or basic.
Velocity & Acceleration Calculator
Solve kinematics problems using equations of motion. Calculate velocity, acceleration, time, or distance from the other known values.
Chemical Equation Balancer
Balance chemical equations and calculate stoichiometry. Find limiting reactants and product yields.
Kinetic Energy Calculator
Calculate kinetic energy from mass and velocity. Use the formula KE = ½mv².
Potential Energy Calculator
Calculate gravitational potential energy from mass and height. Use the formula PE = mgh.
Momentum Calculator
Calculate momentum from mass and velocity. Use the formula p = mv.
Power Calculator
Calculate power from work and time, or force and velocity. Use formulas P = W/t or P = Fv.
Electrical Engineering Suite
Complete electrical calculator — Ohm's Law, voltage drop, resistor color codes, series/parallel circuits, and capacitor calculations for engineers and hobbyists.
Physics Essentials Calculator
Complete classical mechanics calculator — force, velocity, acceleration, kinetic/potential energy, momentum, power, and projectile motion calculations.