Is this the official Duckworth-Lewis-Stern (DLS) calculator?

No. The official method uses a proprietary exponential decay table maintained by the ICC and is not public. This tool uses a simplified, published-style resource table to illustrate how the method works and will not exactly match broadcast figures.

What is "resource percentage"?

It represents how much batting potential a team has left, based on overs remaining and wickets in hand. A team starting its innings with all overs and no wickets down has 100% resource; resource falls as overs are used and wickets fall.

Why do I enter wickets lost for Team 2 but not Team 1?

This calculator assumes Team 1 completes its innings without a further stoppage, so its resource used is based only on the overs it faced. Team 2's figures capture the moment the target is revised, which can include wickets already lost.

What is the G50 constant?

It is the average total score for a completed, unaffected innings, used only when Team 2 has more resource than Team 1 had. The default of 245 is a typical modern one-day figure; adjust it for T20 or a different scoring environment.

What is the difference between "score to tie" and "target to win"?

The score to tie is the revised par score rounded to the nearest run. The target to win is one run more than that, since a tie is not a win.

Duckworth-Lewis Calculator

Name: Duckworth-Lewis Calculator
Availability: InStock
Author: Nham Vu

Enter each team's overs, wickets, and score to estimate a revised target after a rain interruption.

Match Details

Team 1 (batted first, innings complete)

Overs Faced

Final Score

Team 2 (chasing, at point of interruption)

Overs Available

Wickets Lost

Wickets already down when the reduced overs figure was set. Use 0 if the reduction happened before Team 2 batted.

Advanced: average score constant (G50)

G50

Used only when Team 2 has more resource than Team 1 had. Default 245 is a typical one-day average; lower it for T20.

Quick Examples

Enter both teams' details on the left to see the revised target

How the Target Is Estimated

If R2 ≤ R1: Par = Score1 × (R2 ÷ R1)

If R2 > R1: Par = Score1 + G50 × (R2 − R1) ÷ 100

R1 and R2 are resource percentages read from a simplified overs-and-wickets table. Target to win is the par score rounded down, plus one run.

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Summary

Enter each team's overs, wickets, and score to estimate a revised target after a rain interruption.

How it works

Enter the overs Team 1 actually faced and the total runs they scored.
Enter the overs available to Team 2 and how many wickets, if any, were already down when that number of overs was set.
The calculator looks up each team's resource percentage from overs remaining and wickets lost.
If Team 2 has fewer resources than Team 1 had, the target scales down proportionally.
If Team 2 somehow has more resources, extra runs are added using an average-score constant (G50), which you can adjust.
The revised target and the score needed to tie are shown side by side.

Use cases

Estimate a fair chase target after rain interrupts a run chase.
Understand how resource percentage changes with overs and wickets.
Check a broadcast-quoted revised target against a rough independent estimate.
Explore how big a difference losing wickets early makes to resource loss.
Teach or learn the logic behind the Duckworth-Lewis method.
Compare scenarios by adjusting overs and wickets lost.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu