Duckworth-Lewis Target Calculator

D/L Standard Edition Target Formula

If R2 < R1: par = floor(S × R2 / R1). If equal: par = S. If R2 > R1: par = S + floor((R2 − R1) × G50 / 100). Target = par + 1.

Identify the Edition Before Entering Data

This tool implements the documented D/L Standard Edition arithmetic. Current ICC Duckworth-Lewis-Stern calculations use separate software. The Standard Edition result must not be presented as a reproduction of that current model. Use resource inputs that belong to the same Standard Edition method and an appropriate agreed G50 parameter.

What the Resource Inputs Mean

S is Team 1’s completed score. R1 and R2 are the available resource percentages after applicable resource losses have already been accounted for. They are not simply percentages of overs remaining. The calculator accepts supplied percentages to three decimal places and requires R1 greater than zero. It does not derive them from wickets or interruption times.

Worked Example with Fewer Resources

For an illustrative Team 1 score of 250, R1 of 100%, and R2 of 80%, the ratio calculation gives 250 × 80 / 100 = 200. Par is 200 and the target is 201. These chosen percentages demonstrate the arithmetic; they are not a resource-table lookup for a particular match state. G50 does not change this branch.

Worked Example with More Resources

Use an illustrative score of 200, R1 of 80%, R2 of 90%, and G50 of 245. The extra-resource contribution is 10 × 245 / 100 = 24.5 runs. Ignore the fractional run, add 24 to the original 200, and then add one for the winning target. Par is 224 and the target is 225.

Par and Target Are Different

The par score is the whole-number benchmark. The target to win is one run higher. For example, a calculated base of 199.999 yields par 199 and target 200. Do not round the base to the nearest run first. The implementation uses scaled integer resource inputs to preserve these whole-run boundaries.

Choosing G50

G50 represents the baseline 50-over total used by the Standard Edition’s extra-resource branch. The prefilled 245 is a historical example from the cited method. It is editable because the applicable value depends on the rules being used. A different G50 can change the increased-resource target while leaving the reduced-resource target unchanged.

What to Check if the Score Differs

Check the method edition, resource percentages, original score, and G50. Also check whether penalties or subsequent interruptions changed the official calculation. Comparing a Standard Edition output with a current DLS announcement does not establish that the announcement is wrong. The result table identifies which branch the calculator used.

Assumptions and Limits

This calculator performs target arithmetic from supplied resources. It contains no resource table, does not estimate lost resources, and does not decide whether enough play has occurred for a result. Special penalty adjustments are excluded. An organizer’s official revised target remains the input to use for a real chase.

Reference Table

Sources

ICC, Duckworth-Lewis Methodology for Re-calculating the Target Score in an Interrupted Match, Standard Edition, sections 1–5. ICC, Duckworth Lewis Stern methodology overview, accessed September 2026.