# HeightPair

> Compare two heights on a chart drawn to scale. Mix feet and inches with centimeters, see the exact height difference, and download a PNG to share.

HeightPair provides browser-based height comparison, illustrative body visualization and source-based percentile calculations. Reference dimensions have explicit measurement definitions. One inch is exactly 2.54 cm. Internal comparison values use millimeters.

## Tools and diagrams

- [Height comparison](https://heightpair.com/) Compare people and reference objects on a shared scale, switch units, overlay silhouettes and export PNG images.
- [3D height comparison](https://heightpair.com/tools/3d-height-comparison/) Compare two human heights with an orthographic 3D camera, shared ground, rotation and overlay views.
- [Body visualizer](https://heightpair.com/tools/body-visualizer/) Explore an illustrative body mesh using height, weight, chest, waist, hips and inseam, with local shape controls and A/B comparison.
- [Height difference calculator](https://heightpair.com/tools/height-difference-calculator/) Calculate an absolute height difference, unit conversions and the ratio between two heights.
- [Height percentile calculator](https://heightpair.com/tools/height-percentile-calculator/) Compare height with WHO 2007 child and teen reference data or CDC/NHANES measured US adult quantiles.
- [Height difference chart](https://heightpair.com/resources/height-difference-chart/) Read static height-difference diagrams, inch conversions and example ratios for gaps from 5 to 30 cm.

## Methods and sources

- [Measurement scale](https://heightpair.com/sources/#comparison-scale) Units, endpoints and the shared baseline.
- [Body model](https://heightpair.com/sources/#body-model) Source mesh, measurement contours and intended use.
- [Percentile methods](https://heightpair.com/sources/#percentiles) Reference populations, interpolation and tail handling.
- [WHO height-for-age tables](https://www.who.int/tools/growth-reference-data-for-5to19-years/indicators/height-for-age) Original WHO 2007 growth reference.
- [CDC/NCHS anthropometric reference report](https://www.cdc.gov/nchs/data/series/sr_03/sr03-050.pdf) US adult height quantiles, Table 7.
- [Full tool and reference guide](https://heightpair.com/llms-full.txt) Input ranges, calculations, body templates, sharing, exports, MCP integration and the sourced catalog.

## Optional

- [About](https://heightpair.com/about/) Project overview and public contact.
- [Privacy](https://heightpair.com/privacy/) Browser storage, shared links, hosting and statistics.
- [Terms](https://heightpair.com/terms/) Use of the tools and reference information.

Contact hello@heightpair.com.