Physics Calculators

Free physics calculators — speed, velocity, force, energy, density, kinetic energy, and more. Instant results with formulas shown. No sign-up needed.

Speed Calculator — Distance ÷ Time

Calculate speed from distance and time instantly. Outputs in m/s, km/h, mph, and ft/s. Works for any object in motion.

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Velocity Calculator — Speed with Direction

Calculate velocity from displacement and time. Understand the difference between speed and velocity with directional results.

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Displacement Calculator — Kinematics

Calculate displacement using d = vt or the kinematic equation d = v₀t + ½at². Handles uniform and accelerated motion.

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Force Calculator — Newton's Second Law

Calculate force using F = ma. Enter mass and acceleration to get force in Newtons, kgf, and lbf instantly.

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Net Force Calculator — Sum of Forces

Calculate the net force on an object by summing multiple directional forces. Shows resultant force and direction.

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Density Calculator — Mass per Volume

Calculate density from mass and volume using ρ = m/V. Outputs in g/cm³, kg/m³, and lb/ft³. Solve for mass or volume too.

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Kinetic Energy Calculator — ½mv²

Calculate kinetic energy using KE = ½mv². Enter mass and velocity to get energy in Joules, kJ, calories, and kWh.

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Gravitational PE Calculator — mgh

Calculate gravitational potential energy using GPE = mgh. Enter mass, height, and gravity to get energy in Joules and kJ.

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Work & Energy Calculator (Joules)

Calculate work and energy in Joules using W = F × d. Convert between Joules, kJ, calories, and kWh instantly.

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Capacitor Energy Calculator — ½CV²

Calculate energy stored in a capacitor using E = ½CV². Enter capacitance and voltage for results in Joules, mJ, and µJ.

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Miles Per Hour Speed Calculator

Calculate speed in miles per hour from distance and time. Also converts mph to km/h, m/s, and ft/s instantly.

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Inches Per Second Speed Converter

Convert speed to and from inches per second. Supports m/s, km/h, mph, ft/s, and in/s with instant bidirectional conversion.

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PSF to PSI Pressure Converter

Convert pressure from pounds per square foot (PSF) to pounds per square inch (PSI) and other units. PSI = PSF ÷ 144.

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mg/mL Concentration Calculator

Calculate concentration in mg/mL from mass and volume. Also outputs g/L and % w/v. Used in pharmacy, chemistry, and nutrition.

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