Calculadora & Conversor Pro
A standard and scientific calculator with a unit converter, in the Brazilian format: decimal comma and thousands dot. It opens with one click from the browser toolbar and calculates offline. The extension interface is in Brazilian Portuguese.
Install it in your browser
Calculadora & Conversor Pro is already in the Chrome, Edge and Firefox extension stores. Pick yours.
Math, the Brazilian way
Decimal comma, thousands dot and the operation in progress always visible.
Calculates offline
The calculator and the converter work offline. Only the Offers tab uses the internet.
Optional Pro version
History of the last 20 calculations and 9 extra converter categories, for a one-time payment of R$ 19.90 (Brazilian reais).
Calculator, scientific mode, converter and Pro
Calculator in the Brazilian format 
Scientific mode 
Unit converter 
Light, dark and Pro history
Calculations and conversions made simple
Standard calculator
Addition, subtraction, multiplication, division and percentage. Click the result to copy it.
Scientific mode
Sine, cosine and tangent in degrees, square root, square, log, ln and pi. The applied function appears above the result.
Unit converter
Length, mass, temperature, data and time, with the result shown as you type and a button to swap units.
Full keyboard support
Numbers, comma, operators, Enter, Backspace and Esc work as expected.
Remembers where you left off
On reopening, the extension restores the last calculation, the tab, the mode and the chosen units.
Accessible
Light and dark themes, full keyboard navigation, screen reader support, high contrast and respect for the reduce-motion setting.
You know what the extension does
No sign-up and no tracking
The extension asks for no sign-up, collects no personal data and uses no usage analytics or personalized advertising.
Data stays in your browser
The calculation, the preferences and, in the Pro version, the license key and the history stay only in the browser's local storage.
Payment on Stripe
Buying Pro opens Stripe's payment page. Payment details never pass through the extension.
Offers with affiliate links
The Offers tab has affiliate links (Lomadee and Amazon). If you buy, Klivfy may earn a commission at no extra cost to you. It is the only tab that uses the internet.
Where to use it
Browser
Available: extension for Chrome, Edge and Firefox on the computer.
Language
The extension is available in Brazilian Portuguese.
Questions about Calculadora & Conversor Pro
Where can I install it?
In the Chrome, Edge and Firefox extension stores, using the buttons on this page.
Is the extension free?
The calculator, scientific mode and basic converter are free. The Pro version is optional, with a one-time payment of R$ 19.90 (Brazilian reais) and no subscription.
What does the Pro version include?
The history of the last 20 calculations and conversions, with an option to undo when clearing, and 9 extra converter categories: volume, speed, area, energy, pressure, fuel, power, angle and frequency.
Does it need internet?
Not to calculate or convert. Only the Offers tab, with affiliate links, uses the internet.
Does the extension collect my data?
It asks for no sign-up and collects no personal data. What it stores stays in the browser's local storage.
Which languages is it available in?
Brazilian Portuguese.