Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Relativity
Time Dilation Calculator
Compute the time experienced by a stationary observer for a moving clock that ticks through a given proper time, using special relativity. Returns the dilated time interval in the same units as the proper-time input.
Fill in the required fields to see your result.
Relativity
Length Contraction Calculator
Compute the contracted length of an object measured by an observer relative to whom it moves at high velocity, using special relativity. Returns the contracted length in the same units as the rest length.
Fill in the required fields to see your result.
Key differences
| Time Dilation Calculator | Length Contraction Calculator | |
|---|---|---|
| Category | Relativity | Relativity |
| Inputs required | 2 | 3 |
| Result | Dilated Time (time units) | Contracted Length (length units) |
| What it does | Compute the time experienced by a stationary observer for a moving clock that ticks through a given proper time, using special relativity. Returns the dilated time interval in the same units as the proper-time input. | Compute the contracted length of an object measured by an observer relative to whom it moves at high velocity, using special relativity. Returns the contracted length in the same units as the rest length. |