Vcalc.com has been online since 1999, which is an impressive track record for any website. It's essentially a collection of online calculators for math, science, finance, and more. The site loads fast, uses a secure connection, and has never appeared on threat lists or blacklists. So on the technical side, it's clean.
Where things get less clear is the lack of a privacy policy or terms of service. For a site that asks you to input numbers (and potentially personal information depending on the calculator), that's an oversight. Most U.S.-based web tools at least have a basic privacy page. Without one, you don't know what they do with any data you enter, even if it's just calculations. Also, vcalc.com doesn't set the browser protections that block clickjacking or enforce HTTPS-only connections — common for older sites, but worth noting.
Is vcalc.com a scam? Probably not. The history and infrastructure suggest a real project run by someone who has maintained it over the years. But the missing legal pages mean you should treat it like a useful tool, not a service you trust with personal information. If you're just calculating a mortgage payment or a physics formula, you're likely fine. If the site ever asks for your email or an account, that's a different conversation.