How to use Linear Interpolation (Lerp)
Get the best out of Linear Interpolation (Lerp): every option explained, a worked example, and what to check when the output is not what you expected.
Updated July 31, 2026
What it does
Compute intermediate values between two endpoints using a normalized interpolation factor. It runs entirely in your browser — your input never leaves your device.
Options
Every setting this tool exposes, straight from the code that validates it.
| Option | Type | Default | What it does |
|---|---|---|---|
start | number | — | Required. |
end | number | — | Required. |
t | number | — | Interpolation factor (typically 0-1). Required. |
Worked example
Run these settings on the tool page:
start:2end:2t:2
You get:
{
"result": 2
}
Getting the result you want
Most of the control here is in the options above. If the output is not what you expected, the setting to check first is the one you changed last — the defaults suit most input.
Troubleshooting
- Nothing happens / the output stays empty.
start,end,tare required — the tool waits until you provide them. - It is slow on very large input. Everything runs in your browser, so speed depends on your device. Very large inputs are best split up, or run through the API where the work happens on our servers.
Automating it
The same logic is available as a REST endpoint, so you can run it from a script, a CI job or your own app.
Bashcurl "https://api.toolsxpo.com/v1/lerp-calculator" \ -H "Authorization: Bearer $TOOLSXPO_KEY"
It costs 1 credit per successful call. See the full endpoint reference, or try it in the playground.
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