About Numelto
What Numelto is
Numelto brings together calculators and tools built to answer concrete questions — not "what's 15% of 200?", but "how much do I need to invoice to take home $2,000 a month?" or "am I better off buying or renting?". Alongside calculators (money, housing, self-employment, ecommerce, car, energy, pool, math, dates, marketing, and country-specific payroll/tax calculators), it includes tools that process files and data: PDF, image, text, developer utilities, and data/documents (CSV and Excel, e-invoicing XML, ID validators).
Why it exists
Plenty of everyday decisions (a mortgage, a sale price, an hourly rate, comparing two data exports) come down to calculations anyone could do in a spreadsheet — but almost nobody does, either because getting the formula right is fiddly or because it's just easier not to bother. The idea is to remove that friction: you enter your numbers or your file, the tool does the work, and it explains how it got that result.
Who's behind it
Numelto is a personal project by Manuel — not a company, not a team, no tax or financial advisors behind each tool. Every calculator is built and reviewed carefully, citing official sources when the result depends on a tax or regulatory figure (see the methodology page), but that's no substitute for a professional's advice on decisions that matter.
Privacy: what happens in your browser
Calculators always run in your browser: the numbers you enter are never sent to any server. Tools that work with files (PDF, image, CSV/Excel, invoicing XML) also process that file entirely in your browser — it's never uploaded to Numelto or any external service — and say so explicitly on their own page when that's the case. Numelto uses analytics to know which pages and tools get used (never file contents, file names, or anything you type into a tool), and may show ads in the future; see the privacy policy for the full detail.
Universal calculators vs. country-specific ones
Universal calculators (math, conversions, car, energy, pool, marketing...) use formulas that don't depend on any country's legislation. Payroll and tax calculators do depend on a specific country's rules (Mexico, Colombia, Argentina, Chile, Peru, Ecuador, the Dominican Republic or Spain): each one states its country, its currency and, where it applies, the official source it's based on.
How regulatory data is kept up to date
Regulatory figures (tax brackets, minimum wages, contribution rates, reference units) live centralized in the code together with the date they became valid and, once re-checked, the date of the last review — never scattered loose inside a calculator. See the methodology page for how and when they're reviewed.
No account needed
Numelto has no user accounts, no login, no paid plans: every calculator and tool is used directly, with nothing to create and no data saved on any server.
What “indicative result” means, and its limits
Most tools say this somewhere: they're simplified estimates, not a substitute for a real payslip, a tax return, or an accountant's analysis. An ID validator (tax ID, national ID, business registry number...) only checks that the format and check digit are correct — it doesn't confirm the person or company actually exists or is in good standing with the relevant authority. A tool that reads an e-invoice XML interprets its content, but doesn't replace official validation with the tax authority. When a calculator can't reliably reproduce a full official calculation, it says so explicitly instead of appearing more precise than it is.