Internet and Networking Calculators: Bandwidth, Encoding and Passwords
These tools cover everyday networking and web tasks: estimate how long a download will take from the file size and connection speed, encode or decode Base64 text, and check password strength. For a deeper understanding of network delays and how packets travel, try the interactive networking simulations in the Virtual Lab.
5 free internet calculators
IP Subnet Calculator
Network/broadcast address, host range and host count for an IPv4 address + CIDR prefix.
Open calculator →Password Generator
Generate a random password with the character sets and length you choose.
Open calculator →Bandwidth Calculator
Estimate how long a file transfer will take, given size and connection speed.
Open calculator →Base64 Encode / Decode
Convert text to Base64, or decode a Base64 string back to text.
Open calculator →URL Encode / Decode
Percent-encode text for safe use in a URL, or decode it back.
Open calculator →Frequently asked questions
How do I estimate file download time?
Divide the file size in bits by the connection speed in bits per second. The bandwidth calculator does this and handles the unit conversions.