Choose Your Relativity Mode
Select Velocity Mode for Special Relativity (moving observers) or Gravity Mode for General Relativity (gravitational fields near massive bodies).
Time Dilation Calculator – Relativity Based Time Calculations
Calculate relativistic time dilation from velocity or gravitational fields. Solve for proper time, dilated time, velocity, or Lorentz factor instantly.
Parameters — Special Relativity
Δt = Δτ / √(1 − v²/c²) = γ · Δτ
× c
Result
--
Enter 2 values to calculate
Speed relative to c
0%
Lorentz Factor (γ)
--
Time Ratio (Δt/Δτ)
--
Time Gained by Observer
--
Dilation Curve (γ vs v/c)
Velocity Reference Table
| Speed (v/c) | Lorentz Factor (γ) | Traveler Time (Δτ) | Observer Time (Δt) | Time Slowing |
|---|---|---|---|---|
| Calculate to generate relativistic reference table. | ||||
Parameters — General Relativity
Δt_far = Δt_near / √(1 − 2GM / rc²)
Result
--
Enter values to calculate
Gravity Depth (Schwarzschild ratio)
0%
Gravitational Factor (√g₀₀)
--
Time Ratio (far/near)
--
Time Difference
--
Gravitational Field Curve
Gravitational Dilation Reference Table
| Distance (× r) | Gravity Factor | Near Time | Far Time | Difference |
|---|---|---|---|---|
| Calculate to generate gravitational dilation reference table. | ||||
How Time Dilation Calculator Works
Switch between Special and General Relativity modes, enter your known values, and instantly compute how time bends across reference frames.
Load a Scenario or Enter Values
Choose from real-world presets — ISS orbit, cosmic ray proton, neutron star surface — or enter your own velocity, mass, and time values manually.
Solve for the Missing Variable
Fill two known values and leave the third blank. The engine solves for proper time, dilated time, or velocity using the Lorentz transformation.
Read the Lorentz / Gravity Curve
A live curve plots how the Lorentz factor or gravitational factor changes across the full range, marking your calculated data point precisely.
Review the Reference Table
A detailed table shows time dilation values at key velocities or gravitational depths, with the row closest to your scenario highlighted automatically.
Print or Reset Your Calculation
Export a print-ready report of your relativistic calculation for coursework or research, or reset all fields instantly to start a new scenario.
Key Benefits of Time Dilation Calculator
From physics students to aerospace engineers — explore why this tool is trusted for precise relativistic time calculations across both Special and General Relativity.
Dual Relativity Modes
Switch seamlessly between Special Relativity (velocity-based) and General Relativity (gravity-based) time dilation in a single unified tool.
Instant Real-Time Results
Lorentz factor, time ratio, difference, and decay curve all update the moment you click calculate — no page reload required.
Real-World Scenario Presets
Jump-start calculations using built-in presets: ISS orbit, Voyager 1, twin paradox, neutron star, black hole event horizon, and more.
Live Relativistic Curve Graph
An interactive canvas renders the full Lorentz factor curve or gravitational metric, with your exact data point marked and cross-haired.
Visual Speed / Gravity Gauge
A dynamic progress bar shows your velocity as a fraction of light speed — or gravitational depth — giving instant visual context to the dilation.
Multi-Point Reference Tables
Compare dilation values across 9 key velocities or 8 gravitational depths simultaneously, with your scenario row highlighted for instant reference.
Flexible Time Unit Support
Switch between seconds, minutes, hours, days, or years — handles timescales from nanosecond particle collisions to billion-year cosmic journeys.
Print-Ready Report Output
Generate a clean formatted print report of your relativistic calculation — ideal for physics lab reports, homework, and research documentation.
Who Should Use Time Dilation Calculator
Whether you're studying Einstein's relativity, designing satellite systems, or writing science fiction — this calculator was built for your use case.
Students
Physics & Astrophysics Students
Solve special and general relativity textbook problems, verify exam calculations, and build intuition for how velocity and gravity warp time.
Engineering
Aerospace & GPS Engineers
Calculate relativistic corrections for satellite clocks — GPS systems must account for both velocity and gravitational time dilation to stay accurate.
Research
Particle Physics Researchers
Compute muon lifetime extension at relativistic speeds in accelerators, or verify proper vs. lab-frame time for high-energy particle experiments.
Educators
Science Teachers & Professors
Demonstrate live relativistic effects in the classroom — generate Lorentz curves, twin paradox scenarios, and visual reference tables for students.
Creative
Science Fiction Writers
Accurately model how much your characters age during interstellar travel — calculate real relativistic time differences for hard sci-fi narratives.
Astronomy
Astrophysicists & Cosmologists
Model time flow near neutron stars, black hole event horizons, and high-gravity environments — essential for understanding extreme spacetime curvature.
