# Data Missingness Percentage Calculator

> Work out the percentage of missing cells in a data set and how many complete rows are left for a complete-case (listwise deletion) analysis.

Category: Statistics & probability · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/data-missingness-percentage-calculator

Missingness can be counted by cell or by row. A small share of missing cells can still knock out many rows if the gaps are spread across them.

Also called: Missing values calculator, Data completeness calculator.

## Inputs
- Rows (records) (default 1000)
- Columns (variables) (default 20)
- Missing cells (default 500)
- Rows with at least one missing value (default 120)

## Results
- Missing cells
- Observed cells
- Complete rows
- Complete rows (share)
- Rows lost to listwise deletion
- Total cells

## Formula

```
Missing % = Missing cells ÷ (Rows × Columns) × 100;  Complete rows = Rows − Incomplete rows
```

Where:
- Rows × Columns: total cells
- Incomplete rows: rows with any missing value

## Worked example
1. Total cells = 1,000 × 20 = 20,000.
2. Missing = 500 ÷ 20,000 = 2.5%.
3. Complete rows = 1,000 − 120 = 880, so listwise deletion drops 12% of rows.

**Result:** Only 2.5% of cells are missing, but a complete-case analysis would lose 12% of the rows.

## What the result means

The share of rows lost matters more than the share of cells. If it is large, or if missingness may depend on the values themselves, consider multiple imputation instead of dropping rows.

## Assumptions and limits
- Counts come from the same data set.
- Percentages do not tell you why data are missing (completely at random, at random or not at random), which decides the right fix.

## Questions

### What percentage of missing data is acceptable?

There is no universal cut-off. Under 5% is often treated as minor, but bias depends on why values are missing, not just how many.

### Why can’t the missing cells exceed rows × columns in incomplete rows?

Every missing cell sits in an incomplete row, and each such row has at most one cell per column.

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Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/data-missingness-percentage-calculator