---
title: "__longSum"
description: "JMeter __longSum function reference: syntax, parameters, and practical examples for parameterizing test plans with dynamic values."
url: https://docs.jmeter.ai/functions/longsum/
lastUpdated: 2026-10-01
source: docs.jmeter.ai
---

# __longSum

*Also documented in context in the [full Functions and Variables reference](/user-manual/functions/#__longSum).*

The longSum function can be used to compute the sum of two or more long values, use this instead of __intSum whenever you know your values will not
be in the interval -2147483648 to 2147483647.

| Name | Required | Description |
| --- | --- | --- |
| First argument | Yes | The first long value. |
| Second argument | Yes | The second long value. |
| nth argument | No | The nth long value. |
| last argument | No | A reference name for reusing the value computed by this function.                 If specified, the reference name must contain at least one non-numeric character otherwise it will                 be treated as another long value to be added. |

Examples:

```bash
\${__longSum(2,5,MYVAR)}
```

will return 7 (2+5) and store the result in MYVAR variable. So `\${MYVAR}` will be equal to 7.

```bash
\${__longSum(2,5,7)}
```

will return 14 (2+5+7) and store the result in MYVAR variable.

```bash
\${__longSum(1,2,5,\${MYVAR})}
```

will return 16 if MYVAR value is equal to 8, 1+2+5+${MYVAR})

## Related

- [Functions and Variables Guide](/topics/functions-and-variables/)
- [Regex Extractor Builder](/tools/regex-tester/)
- [Full Functions Reference](/user-manual/functions/)
- [Component Reference](/user-manual/component-reference/)