How do you calculate the follow on score in test cricket?

Question

Test cricket matches often extend over 3 or 5 days , I want to know that in a test match how follow on score is calculated, please specify the way that is followed to calculate follow on score in a test cricket match?

Answer 1

The number of runs by which a team must lead to enforce follow-on upon its opponent is determined by Law 13 of the Laws of cricket, which takes the length of the match into consideration:  In a match of five days or more, a side which bats first and leads by at least 200 runs has the option of requiring the other side to follow-on.  in one of three or four days, 150 runs;  in a two-day match, 100;  in a one-day (two-innings per side) match, 75.