Developer & Networking5 min read
Compression Ratio vs Space Saving, Explained
A 48 MB file compressed to 12 MB is a 4:1 ratio and a 75% space saving. Learn to convert between them and why 10:1 to 100:1 saves little more.
The Calcylator Blog
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Developer & Networking guides
18 articles
- Developer & Networking5 min read
Decimal to Binary: Divide by 2, Read Backward
Convert any whole number to binary by halving it and reading the remainders from the bottom up. 45 becomes 101101; here is the method and a check.
- Developer & Networking6 min read
Download Time from File Size and Speed
Divide the file size in megabits by the speed in Mbps: 500 MB at 50 Mbps takes 80 seconds, because a byte is 8 bits and Mbps is not MB/s.
- Developer & Networking5 min read
Hex to Decimal: Convert Hexadecimal by Hand
To turn hex into decimal, multiply each digit by a power of 16 and add: 1A3F becomes 6,719. Includes the A to F table, colour codes and a quick shortcut.
- Developer & Networking5 min read
Megapixels: Image Size and Print Resolution
Megapixels are width × height ÷ 1,000,000. A 6000 × 4000 photo is 24 MP and prints about 20 × 13.3 inches at 300 PPI. See how to size for print.
- Developer & Networking4 min read
IP Address Subnet Calculation: Network, Broadcast, Hosts
Give an IPv4 address and prefix and you can derive its network, broadcast and host range. 10.20.77.130/27 sits in 10.20.77.128 to .159 with 30 hosts.
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