Duckworth-Lewis-Stern (DLS) Calculator
Calculate revised target scores in rain-affected limited-overs cricket matches using the Duckworth-Lewis-Stern (DLS) method. Supports delayed, cut short, and interrupted innings with resource comparison charts.
Team 1 (Batting First)
Team 2 (Batting Second)
About This Calculator
The Duckworth-Lewis-Stern (DLS) Calculator helps cricket officials, players, coaches, and fans determine fair revised target scores when limited-overs matches are interrupted by rain or other conditions. Named after statisticians Frank Duckworth, Tony Lewis, and Professor Steven Stern, this mathematical method has been the official ICC standard for rain-affected matches since 1999. It creates statistically fair targets that account for both the overs remaining and wickets in hand — two critical resources that determine a team's scoring potential.
The DLS method is based on the principle that a team's ability to score runs depends on the combination of overs and wickets available. A team with 30 overs and 10 wickets can bat more aggressively than a team with 30 overs and 5 wickets because they have more batting resources in hand. The method uses the Standard Edition resource table to convert any combination of overs remaining and wickets lost into a resource percentage. When Team 2's resources are less than Team 1's, the target is reduced proportionally using the formula: Par Score = Team 1 Score × (Team 2 Resources / Team 1 Resources). When Team 2 has more resources, the target is increased using the G50 average score: Par Score = Team 1 Score + G50 × (R2 - R1) / 100.
Before DLS, methods like Average Run Rate (ARR) and Most Productive Overs (MPO) were used, but these had significant flaws — they ignored wickets in hand and often produced unfair targets. The most famous example of ARR's failure was the 1992 World Cup semi-final between England and South Africa, where a rain interruption left South Africa needing 22 runs from 13 balls before rain, but a revised target of 21 runs from 1 ball after — a virtually impossible task. This injustice inspired Duckworth and Lewis to create their method.
Regional Notes
India (IN): The Board of Control for Cricket in India (BCCI) uses the DLS Professional Edition for all international matches and IPL games. The Indian cricket team has experienced numerous DLS-affected matches in ODIs and T20Is. The IPL 2023 final between Chennai Super Kings and Gujarat Titans was decided by DLS, with CSK chasing a revised target of 171 from 15 overs against GT's 214 from 20 overs.
United Kingdom (UK): The England and Wales Cricket Board (ECB) adopted the DLS method for all professional domestic competitions including the County Championship One-Day Cup, T20 Blast, and The Hundred. The method was developed in the UK and has been used in English cricket since its inception in 1997. The ECB publishes official DLS resource tables and regulations annually.
United States (US): Major League Cricket (MLC), launched in 2023, and Minor League Cricket use the DLS method for rain-affected matches following ICC standards. USA Cricket, the governing body, mandates DLS for all its sanctioned limited-overs competitions. As cricket grows in the US, understanding DLS becomes increasingly important for the expanding cricket community.
Frequently Asked Questions
What is the Duckworth-Lewis-Stern (DLS) method?
The Duckworth-Lewis-Stern (DLS) method is a mathematical formulation used in limited-overs cricket to calculate a fair target score for the team batting second when a match is interrupted by rain or other conditions. It was originally devised by English statisticians Frank Duckworth and Tony Lewis in 1997, and later updated by Australian professor Steven Stern in 2014. The method is the official ICC standard for rain-affected matches.
How does the DLS method calculate a revised target?
The DLS method works by calculating each team's available 'resources' — a combination of overs remaining and wickets in hand. It uses a standard reference table to convert overs and wickets into a resource percentage. If Team 2 has fewer resources than Team 1, the target is reduced proportionally: Par Score = Team 1 Score × (R2 / R1). If Team 2 has more resources, the target is increased using G50: Par Score = Team 1 Score + G50 × (R2 - R1) / 100. The target to win is the par score rounded up.
What resources do teams have in limited-overs cricket?
In limited-overs cricket, each team starts with two key resources: a specific number of overs (typically 50 in ODIs or 20 in T20s) and 10 wickets. A team's ability to score runs depends on the combination of these resources remaining. The DLS method asserts that a team's scoring potential is proportional to the percentage of resources it has available — more overs and wickets mean higher scoring potential.
What is G50 in the DLS method?
G50 is the average score expected from the team batting first in an uninterrupted 50-over match. It is used in the Standard Edition of DLS when Team 2 has more resources than Team 1. The ICC currently sets G50 at 245 runs for international matches involving full member nations. For lower-level competitions, a different G50 value may be more appropriate based on historical scoring patterns.
What is the difference between Standard Edition and Professional Edition?
The Standard Edition uses a published reference table for resource percentages and can be calculated manually or with basic tools. It is suitable for club and amateur cricket. The Professional Edition uses proprietary software that adjusts resource percentages based on the actual first-innings score, making it more accurate for high-scoring matches. International cricket uses the Professional Edition since 2004.
What is the minimum overs requirement for a DLS result in ODI cricket?
In One Day Internationals (ODIs), both teams must face at least 20 overs for a DLS result to be valid, unless one or both teams are bowled out earlier or the team batting second chases the target in fewer overs. For Twenty20 matches, both teams must face at least 5 overs. If weather prevents reaching these minimums, the match is declared a no result.
How are cricket resources calculated when an innings is interrupted?
When an innings is interrupted, the total resources used is calculated as: Resources Used = 100% - Resources Remaining at Interruption + Resources Remaining at Restart. For example, if a team had 31 overs and 8 wickets remaining (68.6% resources) when rain stopped, and resumes with 17 overs and 8 wickets (46.7%), the resources used = 100% - 68.6% + 46.7% = 78.1%. This accounts for the resource lost during the stoppage.
What methods were used before the DLS method?
Before DLS, the most common methods were Average Run Rate (ARR) and Most Productive Overs (MPO). ARR simply compared run rates without considering wickets lost, while MPO ignored the best bowling overs. Both had serious flaws. The famous 1992 World Cup semi-final between England and South Africa exposed ARR's weakness when a rain interruption left South Africa needing an impossible 21 runs from 1 ball under ARR, while DLS would have given a fair target of 4-5 runs from the final ball.