About 7bc.site
7bc.site is a free online collection of premium calculators and generators built for business owners, freelancers, contractors, and independent professionals. We believe the math behind important financial decisions should be transparent, accurate, and accessible to everyone — not locked behind paywalls, sign-up walls, or generic templates that treat you like a lead to be captured.
Every tool on this site was built from scratch by our editorial team using standard, verified formulas. We cite our sources, show our work, and explain the results in plain English so you leave each page understanding the number in front of you — not just trusting a black box. When a calculator uses a tax rule, accounting standard, or regulatory threshold, we link to the original source so you can verify it yourself.
Our mission
Most online calculator sites fall into one of two traps. The first is the "calculator farm" — hundreds of thin, duplicated tools with no explanation, designed to capture search traffic and serve ads. The second is the "paywall calculator" — useful tools hidden behind email gates or premium subscriptions, forcing you to trade your contact information for a number you should be able to compute for free. We built 7bc.site to be neither.
Our mission is to be the calculator site we wished existed: deep, original content paired with working tools, all free, all private, all explained. We run lightweight ads to cover hosting and editorial costs — that's the entire business model. No data selling, no email lists, no upsells.
How we build calculators
Every calculator on 7bc.site follows a three-step build process. First, we identify the standard formula from authoritative sources — IRS publications for tax calculations, FASB guidance for accounting metrics, accepted finance textbooks for investment metrics, and official platform documentation for generators. Second, we implement the formula and test it against worked examples we can replicate by hand. Third, we write a plain-English explanation covering what the metric means, how to interpret the result, common pitfalls, and a worked example.
When tax rules, accounting standards, or platform policies change, we update the affected calculators and note the update date. You'll see a "Last updated" timestamp on every tool page. If you spot an error or an outdated formula, please contact us — we take corrections seriously and fix them quickly.
Privacy and data
Every calculation on 7bc.site runs entirely in your browser. The numbers you enter — your salary, expenses, client details — never leave your device. We don't have a server-side database of your inputs, we don't log them, and we don't sell them. The only data we collect is anonymous analytics (page views, general location) to understand which tools are most used and where to focus improvements. Read our Privacy Policy for full details.
Who we are
7bc.site is operated by a small team of finance professionals, freelance writers, and software developers who have collectively spent decades running small businesses, consulting for clients, and building web tools. We've felt the pain of bad calculators — both as users and as creators — and we built this site to be the resource we wished we had. We're not affiliated with any financial institution, accounting firm, or software vendor. Our recommendations are based on what works, not on partnerships or affiliate deals.
Get in touch
We love hearing from users. If you have a calculator request, spotted an error, want to suggest an improvement, or just want to say thanks, reach out. We respond to every message within two business days. If you're a journalist, researcher, or educator looking to cite our work, we're happy to provide methodology details and source citations on request.