# Predictions

A prediction is a population estimate, not a measurement of a person standing in front of you. You choose the inputs. The app looks them up on the device.

## Inputs

| Input | Range |
| --- | --- |
| Measurement | One entry from the [catalog](https://docs.humanform.app/measurements) |
| Country | One [country or region](https://docs.humanform.app/countries) |
| Gender | Male, female, or everyone |
| Age | 1 through 88 |
| Percentile | 1 through 99 |

An age band, used by Design Fit, population, and accommodate, is census-weighted. A single age is not.

## Where the number comes from

The calculation stays on the device. Nothing is sent to a Humanform server to produce the number. A [shared link](https://docs.humanform.app/sharing) describes the same population prediction. It is not a personal measurement and it is not a Vault entry.

## Units

The app can show millimetres, centimetres, or inches. This site does not publish measurement values. Read them in the app, with [humanform-cli](https://docs.humanform.app/cli), or through [MCP](https://docs.humanform.app/mcp).