Special relativity (time dilation) Calculator

Calculates the time dilation of a body moving for some time with some relative velocity with respect to the observer.

Elapsed time at a body T0
    1. sec
Relative velocity v
    1. km/s
    2. ≦c

Elapsed time at observer T
    2. sec
Velocity ratio to light v/c
    2. %

    Special relativity (time dilation)
    [1-10] /136Disp-Num
    [1]  2019/04/17 06:45   Male / 40 years old level / An engineer / Very /
    Purpose of use
    [2]  2019/03/10 06:33   Male / 50 years old level / Others / Very /
    Purpose of use
    Working out how fast the ref in the PSG Man U game was travelling such that he played 9 minutes of the 3 added on
    [3]  2019/03/08 13:53   Male / 30 years old level / Self-employed people / Very /
    Purpose of use
    Purpose: LOLs

    My friend said he would be here in 5 minutes but it took him over 18 minutes so I told him he must be going very near the speed of light relative to me for any of that to make sense.
    [4]  2019/03/06 11:10   Male / 20 years old level / High-school/ University/ Grad student / A little /
    Purpose of use
    Studies of quantum physics.
    [5]  2019/02/09 11:08   Male / 20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    how space and time work in daily life
    [6]  2019/01/03 00:12   Male / 30 years old level / A teacher / A researcher / Very /
    Purpose of use
    Calculate how much younger my pilot friend is than he would've been had he chosen a different career. Between 1 and 2 microseconds.
    [7]  2018/09/09 23:46   Male / 60 years old level or over / High-school/ University/ Grad student / Useful /
    Purpose of use
    Nice calculator
    It would be nice to be able to select elapsed time at a body (T0) and Elapsed time at observer (t) units, such as seconds, hour, days, years.
    [8]  2018/08/23 00:21   - / - / - / - /
    Purpose of use
    To find out how fast I need to travel to see the sun turn into a planetary nebula.
    [9]  2018/08/13 23:22   Male / 40 years old level / Others / Very /
    Purpose of use
    2 Peter 3:8 seemed like time dilation of "a day is like a thousand years, and a thousand years are like a day". I converted 1 years into seconds and entered it into the calculator. From subtracting the given speed of light to the V calculated was 1.15m/s which is 2.5MPH slightly less than walking pace of a man.
    [10]  2018/08/10 11:56   Male / 30 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Ascertain if the Parker space probe is anywhere near relativistic velocities... A tenth of a microsecond is actually a very long... then again I work with ultrafast lasers so everything really seems to be slow to me.
    Better way of displaying the elapsed time at observer. It''s hard to count zeros.


    Thank you for your questionnaire.
    Sending completion


    To improve this 'Special relativity (time dilation) Calculator', please fill in questionnaire.
    Male or Female ?



    Purpose of use?
    Comment/Request (Click here to report a bug).Bug report (Click here to report questionnaire.)
    Calculation bug(Please enter information such as specific input values, calculation result, correct result, and reference materials (URL and documents).)
    Text bug(Please enter information such as wrong and correct texts)
    Your feedback and comments may be posted as customer voice.