How to use the kaplan meier calculator
Prepare the values for this calculation
Calculate a Kaplan–Meier product-limit survival curve from time and event/censor records. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- time,event — event 1; censor 0: keep one record per line and preserve the column order shown in the example. Replace the example data with your own complete dataset.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Kaplan–Meier survival summary first. With the unchanged example inputs, it is S(last) = 0. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
The result diagram shows the inputs, method and output. A numeric chart is shown only when the calculation supports a meaningful numeric relationship.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Kaplan Meier Calculator formula
At each event time, S(t)=S(previous)×(1−d/n), where n is at risk immediately before the time and d is the number of events.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| time,event — event 1; censor 0 | One row per line | 2,1
3,0
5,1
7,1
8,0
10,1 |
Worked example
Using the example inputs above, the kaplan–meier survival summary is S(last) = 0.
- Kaplan–Meier survival summary
- S(last) = 0
- Median survival
- 7
- Records
- 6
Results and assumptions
Product-limit estimate; censoring is assumed non-informative.
Fix an input or unexpected result
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.