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Free calculators that show the formula they use, with solved examples — kinetic energy, projectile motion, free fall and more — and every constant at its exact CODATA value.

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Kinetic Energy

Given
Mass 1,500 kg · Velocity 25 m/s
Kinetic energy
468,750 J
Solve it

Projectile Motion

Given
Launch speed 20 m/s · Launch angle 45 °
Range
40.79 m
Solve it

Electricity Cost

Given
Appliance power 2,000 W · Usage per day 3 hours · Electricity price 0.2 €/kWh
Cost per day
1.2 €
Solve it

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Kinetic Energy

KE = ½ × m × v²

Projectile Motion

R = v₀² · sin(2θ) / g

Newton's Second Law

F = m × a

Ohm's Law

I = V / R, P = V² / R

Electricity Cost

Cost = (W / 1000) × hours × price per kWh

Torque

τ = r × F × sin(θ)

Momentum

p = m × v

Free Fall

t = √(2h/g), v = √(2gh)

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Thirty calculators. Every formula, every step.

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Gravity 9.81 m/s² · each bounce loses ~18% of its energy · tap to add more

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