About Metrifold

Metrifold is a growing collection of free calculators, generators and practical tools for jobs where a spreadsheet, an old desktop program or a sheet of scrap paper is still the usual answer. Each tool aims to do one job properly and hand you something usable, such as a full-size template, a CAD file or a fully worked calculation. The first tools cover sheet-metal fabrication, craft templates and ingredient blending.

Operator and contact

Built and maintained by Tomoya Williams. For questions and error reports, email [email protected].

How the tools are checked

The maths for every tool is covered by automated tests. Results are compared with independently computed reference values and published worked examples. For exported files the tests read the files back: DXF files are parsed and their arcs and lines measured, PDF templates are opened with a PDF reader to confirm page sizes, ruler lengths and pattern dimensions in millimetres, and images are decoded to confirm their size and recorded print resolution.

These checks are digital and cannot account for your printer. Print templates at 100% / Actual size and measure the printed ruler or scale bar before relying on them, and check critical dimensions before cutting material or committing a batch. The tools are provided as-is, without warranty.

Privacy

• Your inputs are processed in your browser. Calculations, previews and downloads are produced on your device. There is no Metrifold server that receives or stores what you enter.
• Images stay on your device. Artwork you add to a generator is read and processed inside the page. It is not uploaded to Metrifold's servers or anywhere else.
• Your theme preference. If you choose Light or Dark, the site remembers only that preference in local storage on your device. Choose System to clear it. Tool inputs and artwork are not saved there.
• No accounts. There is nothing to sign up for, and no newsletter prompts.
• No AI or paid APIs. The tools are ordinary code running in your browser. Nothing you enter is sent to an AI service.
• Cookie-free analytics. Metrifold uses Cloudflare Web Analytics to understand traffic and performance, such as page views, the websites that link here and how quickly pages load. Cloudflare says it collects this without cookies or local storage. No advertising scripts are currently loaded by Metrifold.
• Videos. A few pages show one of Metrifold's own YouTube videos as a still image. Nothing is loaded from YouTube until you press play; then the video plays in YouTube's privacy-enhanced player (youtube-nocookie.com), and YouTube's own privacy policy applies to it.
• Hosting. The site is served as static files by Cloudflare Pages. Like any web host, Cloudflare handles technical data such as IP addresses to deliver and protect the site, and may keep standard server logs.
• Settings in the page address. Tool settings can appear in the address (for example ?D=600) so you can bookmark or share a result. Like any web address, it is sent to the host when a page loads and is included in what the analytics script reports. Cloudflare says Web Analytics does not record query strings.

Advertising and privacy choices

We are preparing Google AdSense to help support these free tools. Advertising is not active yet. The site currently includes ownership-verification information and an ads.txt record; these do not load advertising scripts, set advertising cookies or send tool inputs to Google.

When advertising is enabled, Google's certified consent platform provides Consent, Do not consent and Manage options choices for visitors covered by European regulations, including the UK, EEA and Switzerland. The footer's Privacy and cookie settings control lets you reopen those choices where the service is available. Changing or withdrawing consent does not prevent you from using the tools. The consent platform may store your choice on your device.

We do not pass calculator inputs, project settings, artwork or exported files to the advertising service. Like any third-party script running on a web page, advertising code can access page context; our browser-only processing does not mean the entire page makes no network requests.

Read Google's advertising privacy information, how Google uses information from partner sites and Google's ad-personalisation controls. Those account controls are separate from this site's consent choices.