Chess Time Control & Game Length Calculator

How it works

max time per player = base + increment × moves · game ≤ 2 × that · Lichess category by base + 40 × increment (< 3 min bullet, < 8 blitz, < 25 rapid) · FIDE category by base + 60 × increment (≤ 10 blitz, ≤ 60 rapid)

A time control gives each player a bank of minutes plus, in modern chess, a few seconds returned on every move, so the longest a game can last is twice the base plus twice the increment times the number of moves. Real games end well short of that because clocks are rarely run to zero and many games finish before move 40, which is why organisers plan slots at about 70% of the maximum plus a buffer. The rating sites and FIDE classify controls by an estimated duration — base plus a fixed number of increments — so a 10 + 0 game counts as rapid online but blitz over the board. A delay behaves differently from an increment: it protects against flagging on quick moves but never accumulates, so long endgames are harsher.

Worked example

A 15 + 10 game of 40 moves gives each player at most 15 + 400/60 ≈ 21.7 minutes, so the game runs up to about 43 minutes and typically around 30. Lichess calls it rapid (15 + 40 × 10 s = 21.7 min); so does FIDE (15 + 10 = 25 min). Five rounds with 10-minute gaps take about 3 h 10 min typically and 4 h 15 min worst case.

Frequently asked questions