Useful tools for files, numbers and everyday tasks
ConverteArq brings together free online tools and clear, practical guides. Start with the energy converter or browse the current English tools below.
Available in English
Energy converter
Convert joules, calories, kilowatt-hours and electronvolts with documented conversion factors.
Open the converterLength converter
Convert meters, centimeters, kilometers and common imperial units.
Open the converterNumber base converter
Convert non-negative integers between binary, octal, decimal and hexadecimal.
Open the converterPercentage calculator
Calculate percentages, percentage change and reverse an increase or discount.
Open calculatorMore from ConverteArq
Our wider collection includes PDF and image tools, calculators, technology coverage and explainers. Those pages are currently available in Brazilian Portuguese; we are translating them in reviewed batches.
News and technology
Read source-linked reporting and commentary in Portuguese while English editions are prepared.
Browse current reporting in Portuguese