Why it exists
Many refrigerant PT charts and tap drill charts are published as supplier PDFs: fine on a desk, hard to read on a phone on a roof. FieldCharts puts the same kind of reference on fast pages that read cleanly on a phone, and pairs the charts with calculators where one helps, so you can type the reading you have instead of scrolling a grid.
Where the numbers come from
Refrigerant saturation pressures are computed with CoolProp, an open-source thermophysical property library, and every refrigerant is checked against a manufacturer's published chart before it is published. Thread, drill, wire, sheet metal and pipe tables are compiled from the governing standards and manufacturer references and cross-checked against two independent published sources. Each page lists its sources, and the methodology page explains how every value is made.
Who publishes it
FieldCharts is published by Goods Media LLC, a small software company in Arizona. It is free to use, with no account and nothing to buy. The site will be supported by display advertising; ads will never sit above a tool or inside a result.
Use it with judgment
These are reference values for people who already know the work. The equipment or product manufacturer's data always governs: charging charts, torque specifications and installation manuals come first. FieldCharts is not professional advice and is not affiliated with any manufacturer, standards body or agency it cites. See the terms.
Found a number that looks wrong? Email hello@fieldcharts.com with the page and the source you are comparing against. Every fix is logged on the corrections page.