About Vanta Calc
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What we are
Vanta Calcis a privacy-first hub of free online calculators for finance, health, math, date and time, conversions, construction, science, everyday tasks and technology. Every calculation runs locally in your browser — your inputs never leave your device, no account is required, and we don't track what you compute.
Who builds it
Vanta Calc is built by the team behind Mzansify.co(opens in new tab), a South African tax and finance calculator suite covering PAYE, VAT, transfer duty, bond repayments and other South-Africa-specific tools. That work has shaped how we think about precision, transparency, and showing the local context behind every number. Where global rules differ from South African ones, we say so on the calculator page.
How we build calculators
Each calculator on Vanta Calc is more than an input form. We aim for every page to show:
- The formula behind the result, written in plain English
- A worked example with realistic numbers
- The assumptions and limitations of the calculation
- Common questions and edge cases
- A short list of related calculators so you can keep working without bouncing between tabs
See our methodology page for how formulas are sourced and reviewed, and what the "last reviewed" date on a calculator means.
Privacy by design
Vanta Calc is a static site. There is no backend that processes calculator inputs, no database that stores your numbers, and no signup. The calculations happen entirely in your browser. We use standard, privacy-respecting analytics for aggregate page traffic only — see our Privacy Policy for the full detail.
Found a problem?
Calculators have edge cases. If a result looks wrong, a formula looks outdated, or an assumption needs to be clearer, please tell us — see the Contact page for ways to reach us. Reports are how we keep these tools honest.