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Engineering & Science Calculators

Engineering & Science Calculators

35 free tools across electrical & electronics (Ohm's law, resistance, voltage drop, watts, capacitance, inductance, RC circuits, power factor, LED resistors, battery life, generator sizing, resistor color codes), physics (force, pressure, work, power, momentum, kinetic & potential energy, projectile motion, torque, Reynolds number, Bernoulli's equation), chemistry (moles, dilution, pH, ideal gas law, reaction stoichiometry), and conversion & general science (unit converter, speed, density, mass & weight, molarity, molecular weight, pipe volume).

⚡ Electrical & Electronics — 12 tools

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Ohm's Law Calculator

Calculate voltage, current, or resistance instantly using Ohm's Law (V = I × R) — just enter any two values.
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Resistance Calculator

Calculate the total resistance of up to five resistors connected in series or parallel.
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Voltage Drop Calculator

Estimate the voltage drop across a wire run based on its length, cross-sectional area, material, and current load.
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Watt Calculator

Calculate electrical power in watts from voltage and current, or find the missing voltage or current value.
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Capacitance Calculator

Calculate capacitance from stored charge and voltage, or combine multiple capacitors in series or parallel.
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Inductance Calculator

Calculate inductive reactance, inductance, or frequency using the inductive reactance formula (XL = 2πfL).
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RC Circuit Calculator

Calculate the time constant of a resistor-capacitor (RC) circuit, and the voltage during charging or discharging at any given time.
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Power Factor Calculator

Calculate the power factor of an AC circuit from real and apparent power, from real and reactive power, or from the phase angle.
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LED Resistor Calculator

Find the correct current-limiting resistor value (and its power rating) for one or more LEDs in series on a given supply voltage.
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Battery Life Calculator

Estimate how long a battery will last based on its capacity and your device's current or power draw, including a real-world efficiency factor.
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Generator Size Calculator

Estimate the generator capacity (watts) you need based on your total running load and the highest starting surge among your appliances.
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Resistor Color Code Calculator

Decode a 4-band resistor's color code into its resistance value and tolerance percentage.

🧲 Physics — 11 tools

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Force Calculator

Calculate force, mass, or acceleration using Newton's second law of motion (F = m × a).
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Pressure Calculator

Calculate pressure, force, or area using the fundamental pressure formula (P = F ÷ A), with results shown in Pascals, bar, atm, and psi.
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Work Calculator

Calculate mechanical work done by a force using W = F × d × cos(θ), where θ is the angle between the force and the direction of motion.
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Power Calculator (Mechanical)

Calculate mechanical power from work and time, or from force and velocity — the rate at which work is done or energy is transferred.
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Momentum Calculator

Calculate linear momentum, mass, or velocity using the formula p = m × v.
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Kinetic Energy Calculator

Calculate the kinetic energy, mass, or velocity of a moving object using KE = ½ × m × v².
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Potential Energy Calculator

Calculate gravitational potential energy, mass, or height using PE = m × g × h.
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Projectile Motion Calculator

Calculate the time of flight, maximum height, and horizontal range of a projectile launched at an angle, using standard kinematics equations.
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Torque Calculator

Calculate the torque (rotational force) produced by a force applied at a distance from a pivot point, using τ = F × r × sin(θ).
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Reynolds Number Calculator

Calculate the Reynolds number for fluid flow in a pipe to determine whether the flow is laminar, transitional, or turbulent.
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Bernoulli Equation Calculator

Solve Bernoulli's equation for fluid pressure at a second point in a flow system, given pressure, velocity, and height at two points.

🧪 Chemistry — 5 tools

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Mole Calculator

Convert between mass, moles, and molar mass, and find the number of particles using Avogadro's number.
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Dilution Calculator

Calculate the final concentration or volume needed when diluting a solution, using the dilution formula C₁V₁ = C₂V₂.
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pH Calculator

Calculate pH from hydrogen ion concentration, or hydrogen ion concentration from pH — including the corresponding pOH and hydroxide ion concentration.
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Ideal & General Gas Law Calculator

Solve for pressure, volume, moles, or temperature using the ideal gas law PV = nRT.
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Reaction Stoichiometry Calculator

Calculate the moles and mass of a product or reactant in a balanced chemical reaction, using the mole ratio between two substances.

🔄 Conversion & General Science — 7 tools

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Unit Converter

Convert instantly between common units of length, weight/mass, volume, and temperature.
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Speed Calculator

Calculate speed, distance, or time using the relationship Speed = Distance ÷ Time — solve for any one of the three.
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Density Calculator

Calculate density, mass, or volume using the relationship Density = Mass ÷ Volume — solve for any one of the three.
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Mass & Weight Calculator

Calculate an object's weight (gravitational force) from its mass, or its mass from a known weight, on Earth or other bodies in the solar system.
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Molarity Calculator

Calculate the molarity, moles, or volume of a solution using the relationship Molarity = Moles of solute ÷ Volume of solution (in liters).
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Molecular Weight Calculator

Calculate the molecular (molar) weight of a chemical compound automatically from its formula, such as H2O, NaCl, or Ca(OH)2.
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Pipe Volume Calculator

Calculate the internal volume of a cylindrical pipe or tube in liters and cubic meters, based on its inside diameter and length.