Duckworth Lewis Calculator
The Duckworth Lewis Stern method sets a fair target when rain shortens a game. It scales the first side's score by the resources each team had. Enter the score and the resource percentages from the official table.
Calculate duckworth lewis
Fill in the fields and select Calculate.
What you'll need
To use the duckworth lewis calculator, have these figures ready:
- Team 1 score — for example, 250.
- Team 1 resources — for example, 100.
- Team 2 resources — for example, 80.
The calculator then returns the par score for team 2 the moment you press calculate.
How it works
Par score = Team 1 score × (Team 2 resources ÷ Team 1 resources)
You enter the team 1 score, team 1 resources and team 2 resources, and the calculator returns the par score for team 2 using the formula above.
Resource percentages come from the published DLS table and depend on overs left and wickets in hand. This tool applies the core formula once you have those two figures.
When to Use
Use the Duckworth-Lewis calculator to estimate revised targets when rain or other interruptions shorten a limited-overs match. This calculator uses the standard ICC resource percentages model to determine how much batting potential is lost due to lost overs. Please note that for elite international matches, the ICC uses the proprietary DLS Professional software, whereas our tool calculates the standard Duckworth-Lewis formula, which provides an excellent approximation for amateur and club levels.
What the result tells you
The par score is the total the chasing side must beat to win if play stops, given the resources each team had. The figure hinges entirely on the resource percentages, which come from the official table and shift with overs left and wickets in hand. Small changes in those inputs move the target noticeably, which is why the method is applied carefully by the officials.
Benchmarks & Interpretation
Here is how typical results are categorized and interpreted:
| Value / Range | Rating | Description |
|---|---|---|
| Par or above | Ahead | The chasing side is on or ahead of the DLS par score and would win if the match is abandoned. |
| 1–10 below par | Close | The chasing side is slightly behind but still competitive. |
| 11–30 below par | Behind | The chasing side is struggling relative to the revised target. |
| 30+ below par | Well behind | A large deficit that is very hard to recover from in reduced overs. |
Pro Tips & Advice
Understanding DLS helps teams make better tactical decisions during rain-affected matches. When rain threatens, the batting side should aim to stay ahead of the par score at all times. If you are bowling, taking wickets becomes even more important because DLS reduces the target more steeply when the chasing team has fewer wickets in hand. Knowing the DLS table can inform captains about when to accelerate or consolidate during interrupted matches.
ICC DLS Interruption Resource Examples:
The following table shows the percentage of resources available at different stages of an innings based on overs remaining and wickets lost:
| Overs Left | 0 Wickets Lost | 2 Wickets Lost | 5 Wickets Lost | 8 Wickets Lost |
|---|---|---|---|---|
| 50 overs | 100.0% | 83.8% | 49.5% | 15.9% |
| 30 overs | 75.1% | 64.7% | 41.8% | 15.2% |
| 20 overs | 58.9% | 52.4% | 35.8% | 14.3% |
| 10 overs | 34.1% | 31.7% | 24.4% | 11.9% |
For complete specifications and official tables, see the official ICC Playing Conditions documentation.
Step by step
- Enter the team 1 score.
- Enter the team 1 resources (%).
- Enter the team 2 resources (%).
- Select Calculate to read the par score for team 2.
Worked example
If Team 1 made 250 with full resources of 100 percent, and Team 2 has 80 percent resources after a rain delay, the par score is 250 × 0.80, which is 200.
Frequently asked questions
How is the duckworth lewis worked out?
Par score = Team 1 score × (Team 2 resources ÷ Team 1 resources). The Duckworth Lewis Stern method sets a fair target when rain shortens a game. It scales the first side's score by the…
Where do the resource numbers come from?
They come from the official DLS resource table, which lists a percentage for every combination of overs remaining and wickets lost. This tool uses those values rather than reproducing the full table.
Is the DLS method perfectly fair?
No system is perfect. DLS is the best available method and is endorsed by the ICC, but it can occasionally produce targets that seem too high or too low, particularly when the interruption comes at a critical stage of the innings.
Why did DLS replace the original rain rule?
The original method of simply adjusting the run rate was unfair because it did not account for wickets lost. A team that had lost several wickets had fewer resources left, and the old system did not reflect that. DLS accounts for both overs and wickets.
How accurate is the Duckworth Lewis Calculator?
This tool applies the core Duckworth Lewis Stern relationship, where Team 2 par equals Team 1 score times the ratio of resources. The resource percentages are taken from the official DLS table, which depends on overs remaining and wickets in hand. Double check your inputs, since a wrong number going in gives a wrong number coming out.
Is the Duckworth Lewis Calculator free to use?
Yes. Every tool on GamersZone is free, with no account and no limit on how many times you calculate. The maths runs in your browser, so the numbers you enter are never sent to a server or stored.
How we calculate this
This tool applies the core Duckworth Lewis Stern relationship, where Team 2 par equals Team 1 score times the ratio of resources. The resource percentages are taken from the official DLS table, which depends on overs remaining and wickets in hand.