Global tools

These are the calculators on Danfio that give the same answer in any country: PDF, image and file utilities, text and developer tools, date, unit and health arithmetic, and the business, selling and everyday formulas whose figures you supply yourself. No page here applies a U.S. tax rule, a U.S. fee schedule or an imperial default on your behalf: a currency symbol is a display setting rather than a claim about the answer, and nothing you enter leaves your browser.

A tool lands on this page only if taking the United States out of the picture would change nothing about it - not the arithmetic and not the result. Where one of these pages does need a rate or a jurisdiction, that value is an input you type rather than a default the page assumes for you. Loans, credit cards, insurance and tax filing sit on the U.S. hub instead, because their defaults and their calculations are the U.S. market’s.

Income & Payroll

Commissions, rates and the value of time - pure arithmetic you supply the figures for.

4 tools in this category

Business & Freelance

Invoices, quotes, project pricing and subscriptions, priced with rates you supply yourself.

9 tools in this category

Taxes

Sales tax, VAT and other calculations that only depend on the rate you type in.

1 tools in this category

VAT Calculator

Investing & Savings

Compounding, ROI, asset allocation and other math that works in any currency.

9 tools in this category

PDF & Documents

Merge, split, compress, sign and convert files in the browser, with nothing uploaded.

20 tools in this category

Developer Tools

Formatters, encoders, hashes and generators, run on the text you paste in.

20 tools in this category

Text & Writing

Counting, cleaning and transforming text in one click, on your own machine.

20 tools in this category

Everyday & Health

Dates, units, health and sleep arithmetic - the math of daily life, in any country.

17 tools in this category

E-commerce & Online Selling

Conversion, ad break-even, customer value and inventory math, with your own rates.

11 tools in this category

How these calculators work

Every figure here is arithmetic on the numbers you enter. Merge three PDFs and the page copies the pages it was given; format a JSON document and the page prints the text it received; convert five kilometers and the page multiplies by a fixed factor. Nothing is looked up from a table of national rules, so there is no tax year to check and no state to pick.

The boundary is drawn on the tool, not on the category it sits in. A VAT calculator is filed under Taxes but belongs here, because the rate is yours to enter and the arithmetic is the same in every country that charges one. A dimensional weight calculator is filed under E-commerce but belongs on the U.S. hub, because it divides by 139 - the divisor USPS, UPS and FedEx bill in inches and pounds.

Everything runs in your browser: a file you drop on one of these pages is read by the tab, not uploaded, which is what makes them usable for a draft, a payslip or a key you would not paste into a form. Treat every result as a check on your own arithmetic rather than a certification of it.

Where the country-specific tools went

Calculators that apply a U.S. rule or a U.S. market default - federal and state tax, payroll, loans and mortgages, credit cards and debt payoff, insurance and benefits - are collected on the U.S. tools hub, listed once each under the category it lives in.

U.S. tools

Disclaimer

This page is an index, not advice: every calculator it links to is an estimate from the numbers you enter, and none of them is financial, tax or legal advice.

Every tool here processes your data locally in your browser. See the full disclaimer for the limits that apply across the site.

Read the full disclaimer.