Educational tool only. The official DLS method uses proprietary ICC-licensed software with a detailed resource table. This calculator uses a simplified Standard Edition resource table with linear interpolation. Results are approximate and for learning purposes only — not for official match decisions.
DLS Target Calculator
Simplified Duckworth-Lewis-Stern revised target estimator
Enter Team 1's final score from their completed innings.
Enter the scheduled match overs (typically 20 or 50).
Enter overs available to Team 2 after rain reduction.
If Team 2's innings was already underway when interrupted, enter overs faced and wickets lost at the stoppage.
Click Calculate to see resource percentages, par score, and revised target.
Formula: Par Score = Team 1 Runs × (R2 ÷ R1)
Target = Par Score + 1 run
The Duckworth-Lewis-Stern (DLS) Method & Resource Economics
The Duckworth-Lewis-Stern (DLS) method is the mathematical system adopted by the International Cricket Council (ICC) to calculate revised scoring targets when limited-overs cricket matches are interrupted by inclement weather or external delays. First formulated by English statisticians Frank Duckworth and Tony Lewis in 1997 and refined by Australian data scientist Steven Stern in 2014, DLS replaced historically defective target-setting mechanisms.
The foundational innovation of the DLS method is its recognition that a batting side possesses two finite, interdependent resources: overs remaining and wickets in hand. A team beginning a 50-over innings with 10 wickets possesses 100% of its batting resources. If rain shortens a chase to 30 overs before the innings begins, the team loses overs but still possesses all 10 wickets, meaning their resource percentage drops from 100% to approximately 75%—not 60% (as simple pro-rata run rate math would suggest).
Conversely, if play is halted after 20 overs when the chasing side has slumped to 85/5, their remaining resources have suffered severe depletion because 5 wickets have already been consumed. Consequently, their DLS par score is markedly higher than if they were 85/1 at the same juncture.
The 1992 World Cup Farce & The Origin of DLS
Prior to DLS, international cricket relied on crude rain rules: the Average Run Rate (ARR) method and the Most Productive Overs (MPO) method. The terminal defect of MPO was exposed globally during the 1992 World Cup semifinal between England and South Africa in Sydney:
- South Africa required 22 runs from 13 deliveries with 4 wickets in hand—a highly competitive, achievable finish.
- A 12-minute rain delay forced 2 overs to be deducted from the scheduled match quota.
- Under the MPO rule, England's two least productive overs (both maidens) were removed from their 252-run total. As a result, South Africa's revised target became an impossible 21 runs from 1 ball.
This sporting catastrophe inspired Duckworth and Lewis to engineer a system reflecting genuine resource allocation, preventing defensive maiden overs from penalizing the team batting second.
Mathematical Logic & Target Formulas
The core idea of DLS is that each team starts with 100% of two resources: overs to face and wickets in hand. When rain interrupts a match, one or both teams lose a fraction of those resources.
Case 1: Rain reduces Team 2's overs (R2 ≤ R1)
When Team 2 has fewer resources available, their par score is scaled down proportionally:
Par Score = Team 1 Runs × (Team 2 Resources ÷ Team 1 Resources)
Target = Par Score + 1 run.
Case 2: Rain interrupts Team 1 early (R2 > R1)
When Team 1's innings is cut short unexpectedly, Team 2's target actually increases to balance the fact that Team 1 paced their batting without knowing rain would stop play:
Par Score = Team 1 Runs + [ G50 × ((Team 2 Resources − Team 1 Resources) ÷ 100) ]
Target = Par Score + 1 run.
(G50 is the historical baseline first-innings average in 50-over cricket, standardly set at 245).
Simple Example
Suppose Team 1 scores 250 in their full 50 overs (100% resources). A rain delay before the second innings reduces Team 2's chase to 40 overs (which gives them about 89.3% resources):
Par Score = 250 × (89.3 ÷ 100) = 223.25
Revised Target = 224 runs to win in 40 overs.
Disclaimer: This online calculator utilizes the Standard Edition DLS algorithm with standard resource tables for educational analysis. Official international matches use proprietary ICC Professional Edition software.
Common Mistakes in Rain Rule Calculations
Applying Simple Pro-Rata Math
Assuming a team chasing 300 in 50 overs needs 120 in 20 overs ignores that having 10 wickets across 20 overs allows significantly higher attacking intensity.
Ignoring Wickets Lost at Stoppage
DLS par scores rise dramatically with each wicket lost. Being 120/2 in 25 overs is comfortably ahead of par; being 120/6 in 25 overs is well behind par.
Expecting Targets to Always Fall
When Team 1's innings is cut short after they paced their batting cautiously, Team 2's target often increases to compensate for their resource advantage.
Overlooking Minimum Over Rules
A DLS result cannot be certified unless both teams face at least 20 overs in ODIs or 5 overs in T20s. Interrupted matches under this threshold are declared No Result.
DLS Method FAQs
What is the DLS method in cricket?
The Duckworth-Lewis-Stern (DLS) method is the mathematical system used by the ICC to calculate equitable revised targets in rain-affected limited-overs matches by assessing both overs remaining and wickets in hand as combined batting resources.
What is the difference between Par Score and Revised Target?
The Par Score is the exact score at which the match is tied under DLS at any given ball. The Revised Target is the Par Score plus 1 run—the total the chasing team must achieve to win the contest outright.
What does resource percentage mean in DLS?
A team's resource percentage expresses their total scoring capacity based on the combination of overs available and wickets remaining. At the start of a standard 50-over innings with 10 wickets in hand, a team holds 100% of its resources.
Why does the revised target sometimes increase after rain?
If Team 1's innings is terminated prematurely by rain, they paced their innings expecting full overs. If Team 2 subsequently bats with advance knowledge of a shortened chase and all 10 wickets in hand, their target is adjusted upward to balance the resource inequality.
What is the minimum number of overs required for an official DLS result?
Under official ICC playing regulations, both teams must bat for at least 20 overs in One Day Internationals (ODIs) and at least 5 overs in Twenty20 (T20) matches for a valid DLS result to be recorded. If play cannot resume before this threshold, the match is deemed a No Result.
Does DLS apply to Test cricket?
No. DLS applies solely to limited-overs cricket (ODIs and T20s). Test cricket is governed by time and five scheduled days of play, with no over restrictions on individual innings.
What happens if Team 2 is bowled out during a DLS chase?
If the chasing side loses all 10 wickets, they are bowled out and lose the match, provided they have not already exceeded the par score or revised target prior to the final dismissal.
Is my calculation data saved or transmitted externally?
No. All calculations run strictly client-side inside your browser. No data is stored, cached, or transmitted to any external server.