Duckworth-Lewis-Stern (DLS) Par Score & Revised Target Calculator

The Duckworth-Lewis-Stern method measures each innings as a stock of two resources — the overs still to be bowled and the wickets still in hand. The ICC Standard Edition publishes a single lookup table giving the percentage of a full 50-over innings' resource that remains for every combination of overs remaining (0–50) and wickets lost (0–9). A fresh 50-over innings starts at 100%; the same table is used for every format, so a 20-over innings simply begins from a lower percentage.

Two resource figures drive every calculation: R1, the resource available to the side batting first, and R2, the resource available to the side batting second. For an uninterrupted 50-over innings R1 is 100%. If an innings is shortened, the resource lost to each stoppage is the table value when play stopped minus the value when it resumed; for an innings ended for good, the resource lost is simply the value remaining at that moment.

The revised target then follows three rules from the ICC/ECB regulations, truncating any decimals rather than rounding:

• R2 < R1: Target = floor(S × R2 ÷ R1) + 1
• R2 = R1: Target = S + 1
• R2 > R1: Target = S + floor((R2 − R1) × G50 ÷ 100) + 1

Here S is Team 1's score and G50 = 245is the average total for a 50-over first innings between first-class teams. The par (tie) score is always one run below the target. During a chase that is interrupted, the par score at that instant is Team 1's score multiplied by the resource Team 2 has already used, divided by R1 — the batting side is ahead if their score is above par. A DLS result is only valid once the side batting second has faced a minimum number of overs (20 in an ODI, 5 in a T20 under standard playing conditions); below that the game is a no result.

This calculator implements the Standard Edition only. The Professional Edition, used in international cricket, relies on a licensed program whose algorithm is not published and cannot be reproduced by any free tool. Every figure here is read straight from the transcribed Standard Edition table, last cross-checked against the ICC and ECB source documents on 2026-07-08.

• ICC — Duckworth-Lewis Methodology, Standard Edition (resource table & formulae)
• ECB — Duckworth-Lewis-Stern Regulations 2023 (procedure, validity rules, G50)
• ESPNcricinfo — The Duckworth-Lewis method explained

The Standard Edition resource table used here was transcribed cell-by-cell from the ICC/ECB source documents and last cross-checked on 2026-07-08. Only the Standard Edition is implemented; the Professional Edition is a licensed, undisclosed algorithm.