Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Relativity
Gravitational Time Dilation Calculator
Calculates how gravity slows time near massive objects using Einstein's general relativity. Use it when comparing elapsed time at different distances from a planet, star, or black hole.
Fill in the required fields to see your result.
Relativity
Relativistic Doppler Shift Calculator
Calculates the observed frequency of light or sound when source and observer move at relativistic speeds. Use it when relative velocity is a significant fraction of the speed of light.
Fill in the required fields to see your result.
Key differences
| Gravitational Time Dilation Calculator | Relativistic Doppler Shift Calculator | |
|---|---|---|
| Category | Relativity | Relativity |
| Inputs required | 3 | 3 |
| Result | Time at Infinity (hours) | Observed Frequency (Hz) |
| What it does | Calculates how gravity slows time near massive objects using Einstein's general relativity. Use it when comparing elapsed time at different distances from a planet, star, or black hole. | Calculates the observed frequency of light or sound when source and observer move at relativistic speeds. Use it when relative velocity is a significant fraction of the speed of light. |