How this calculator works
After both sides have batted once, the side that batted first can require the other side to bat again if its lead is large enough. Law 14 of the Laws of Cricket sets the threshold from the scheduled duration: 200 runs in a five-day match, 150 in a three- or four-day match, 100 in a two-day match and 75 in a one-day match. The captain of the side batting first chooses whether to enforce it; the law makes it available, not compulsory. A follow-on saves time but can tire the bowlers, and conditions can change, so captains sometimes bat again instead. Competition regulations may differ, especially when days are lost to weather.
Formula
Lead = first-innings runs - second-innings runs. The follow-on is available when the lead is greater than or equal to the threshold. Runs needed to avoid = max(0, threshold - lead). Thresholds: 200 for five days, 150 for three or four days, 100 for two days and 75 for one day.
Worked example
In a five-day match the side batting first makes 500 and the other side makes 280. The lead is 220, which is at least the 200-run threshold, so the follow-on may be enforced and the second side needs no further runs to avoid it. In a four-day match with scores of 400 and 270, the lead is 130 against a threshold of 150, so 20 more runs would have been needed to avoid the follow-on.
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Frequently asked questions
Is enforcing the follow-on compulsory?
No. The side batting first has the right to ask the other side to bat again, but may choose to bat itself. Tactics, weather and bowler workload all influence the choice.
What happens if the match is shortened?
The Laws base the threshold on the scheduled number of days. Playing conditions for a competition can set a different rule when days are lost, so check the competition regulations for a weather-affected match.
Does a follow-on change the result?
A side that follows on can still win. The follow-on changes the order of innings and the time available, not the target. A team that trails can bat again and set a target for the side that enforced it.