CalcolaFacile
Free online calculators and developer tools
Practical tools for percentages, VAT, margins, markup, salary estimates, unit conversions and developer workflows. Use JWT, JSON, Base64, timestamp, URL encoding, UUID and LLM token tools directly in your browser.
Available tools
VAT Calculator
Add or remove VAT at 22%, 10% and 4%.
JSON Formatter
PopularFormat, validate, minify and copy JSON directly in your browser.
Unit Converter
Convert length, weight, temperature, volume, area, speed and pressure.
Percentage Calculator
Calculate percentages, discounts, increases and decreases.
Margin Calculator
Calculate profit and margin from cost and selling price.
Markup Calculator
Calculate percentage markup from product cost.
Net Salary Calculator
Estimate monthly take-home pay from gross annual income.
Inverse Discount Calculator
Find the original price from a discounted price and discount percentage.
JWT Decoder
Decode the header and payload of a JSON Web Token directly in your browser.
LLM Token Estimator
Estimate token usage and approximate cost for text used with AI models.
Base64 Encoder/Decoder
Encode and decode Base64 directly in your browser.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and back.
URL Encoder/Decoder
Encode and decode URLs for query strings, APIs and redirects.
UUID Generator
Generate UUID v4 identifiers for APIs, databases, tests and software development.
Why use CalcolaFacile?
CalcolaFacile collects small, fast online tools for everyday calculations, business pricing and developer work. You can calculate percentages, VAT, margins, discounts, salary estimates and unit conversions, or use browser-based utilities for JWT, JSON, Base64, timestamps, URL encoding, UUID generation and LLM token estimation. Each page includes simple explanations, practical examples and instant results directly in the browser.