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Both calculators run independently — change the inputs on either side to compare results.

Mass-Energy Equivalence Calculator

Converts mass directly into its equivalent energy using Einstein's E = mc². Useful for nuclear physics problems, particle annihilation scenarios, or understanding the energy content of any amount of matter.

Rest Mass (kg)

Velocity (m/s)

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Relativity

Time Dilation Calculator (Velocity)

Calculates the dilated (coordinate) time experienced by a stationary observer when a moving clock ticks off a given proper time at relativistic speeds. Essential for understanding special relativity and GPS corrections.

Proper Time (years)

Relative Velocity (c (speed of light))

Fill in the required fields to see your result.

Key differences

	Mass-Energy Equivalence Calculator	Time Dilation Calculator (Velocity)
Category	Relativity	Relativity
Inputs required	2	2
Result	Total Energy (J)	Dilated Time (time units)
What it does	Converts mass directly into its equivalent energy using Einstein's E = mc². Useful for nuclear physics problems, particle annihilation scenarios, or understanding the energy content of any amount of matter.	Calculates the dilated (coordinate) time experienced by a stationary observer when a moving clock ticks off a given proper time at relativistic speeds. Essential for understanding special relativity and GPS corrections.