Physics online calculator

Online calculators and formulas for physical calculations

Force and Work

Weight Force (F = m·g) Popular
Calculate weight force from mass and gravitational acceleration
Centrifugal Force (F = m·ω²·r)
Calculate centrifugal force in circular motion
Pressure (p = F/A) Popular
Calculate pressure, force and area relationships
Work, Force and Displacement (W = F·s)
Calculate mechanical work from force and displacement
Power Force Displacement and Time (P = W/t)
Calculate power, force, displacement and time relationships
Inclined plane (F = mg·sin α)
Force analysis on inclined surfaces with friction
Torque (M = F·r)
Rotational force around an axis - fundamental for motors
Efficiency (η = P_out/P_in)
Ratio of useful energy to input energy - machine efficiency
Work Power and Time (W = P·t)
Calculate work, power and time relationships

Energy

Kinetic Energy (E = ½mv²) Popular
Energy of motion depending on mass and velocity
Energy Density
Energy content per unit mass - important for batteries and fuels
Specific Energy
Energy content per unit volume for energy storage design

Speed and Acceleration

Speed, Distance and Time (v = s/t) Popular
Calculate speed, distance and time - fundamentals of kinematics
Acceleration by Time (a = Δv/Δt)
Time-dependent acceleration calculations and velocity changes
Acceleration by Distance (v² = u² + 2as)
Distance-based acceleration calculations for motion analysis
Free-Fall (v = gt)
Free fall under gravitational influence without air resistance
Circular Motion (v = 2πr/T)
Uniform motion on circular paths with orbital velocity
Angular Velocity (ω = φ/t)
Rotational speed around an axis in rad/s
Rotational Speed (n = 60ω/2π)
Rotational frequency in revolutions per minute (RPM)

Sound and Temperature

Sound Pressure (dB)
Conversion between Pascal and Decibel for acoustic measurements
Mach Number (Ma = v/c)
Ratio of object speed to speed of sound
Speed of Sound in Air by Temperature (c = 331√(T/273))
Temperature dependence of sound propagation in different media
Temperature in the Atmosphere
Temperature profile in different atmospheric layers of Earth

Mechanisms

Gear Ratio (i = n₁/n₂)
Transmission ratios in gear systems with speed transfer
Belt Length
Calculate belt lengths for belt drives and transmission systems

Optics

Angle of refraction (n₁sin θ₁ = n₂sin θ₂)
Light refraction at interfaces according to Snell's law

Power Converters

kW - hp converter
Conversion between kilowatts and horsepower
PS - hp converter
Conversion between metric horsepower (PS) and imperial horsepower (HP)

About Physics

Physics is the science of nature and describes the fundamental laws of the universe. Physical calculations form the foundation for:

  • Mechanical Engineering - Force calculations
  • Electrical Engineering - Energy conversion
  • Automotive Engineering - Motion analysis
  • Civil Engineering - Statics
  • Aerospace - Aerodynamics
  • Medical Technology - Biomechanics
Fundamental Physical Laws
Newton's Laws
F = ma
F₁₂ = -F₂₁
Energy Conservation
E_kin + E_pot = const
W = ΔE
Thermodynamics
ΔU = Q - W
PV = nRT
Wave Physics
v = fλ
n₁sin θ₁ = n₂sin θ₂
Tip: Use dimensional analysis to verify your calculations. Force has dimension [MLT⁻²], energy [ML²T⁻²], and power [ML²T⁻³].

Practical Application Examples

Mechanical Engineering
  • Force calculation: Component design
  • Gears: Transmission ratios
  • Efficiency: Performance optimization
Automotive Engineering
  • Acceleration: Engine power
  • Braking distance: Safety calculations
  • Fuel consumption: Energy efficiency
Civil Engineering
  • Statics: Structural calculations
  • Dynamics: Vibration analysis
  • Material testing: Strength analysis
Energy Technology
  • Heat engines: Efficiency
  • Wind power: Power calculation
  • Solar technology: Energy yield
Quick Reference
F = ma
Force
E = ½mv²
Energy
v = s/t
Speed
P = W/t
Power
p = F/A
Pressure