This collection brings together useful everyday tools that don't fit into a single category - from academic calculators to security utilities, unit converters and Islamic finance tools.
The GPA calculator and grade calculator help students track their academic performance and calculate what scores they need on remaining assignments to reach their target grade.
The password generator creates cryptographically secure passwords using your browser's built-in security features - nothing is sent to any server. The QR code generator creates codes for URLs, WiFi networks, contact cards and more.
The unit converter handles 200+ conversions across length, weight, temperature, volume and more. The color palette generator helps designers create harmonious color schemes for their projects.
The subnet calculator helps network administrators calculate IP ranges, while the concrete calculator estimates material quantities for construction projects.
These tools solve small, practical problems. A few details help you use them well.
Passwords. The strength of a password comes from its length and randomness. A random password of 16 or more characters is far harder to guess than a short one with clever substitutions. Use a different password for each account and keep them in a password manager rather than reusing one.
QR codes. A QR code simply encodes text, such as a web address, Wi-Fi details or a contact card. Before you print one, scan it with a phone to make sure it opens the right place, and keep it large enough that a camera can read it from the distance people will stand.
GPA and grades. A weighted average multiplies each grade by its credit hours or weight, adds them up, and divides by the total weight. The Grade Calculator can also work backwards: given your current grade and the weight of the final exam, it shows what you need to score to reach a target. Grading scales differ by school, so match the scale your institution uses.
Subnets. A network written as 192.168.1.0/24 has 256 addresses, of which 254 are usable for devices because the first (network) and last (broadcast) are reserved. Each extra bit in the prefix halves the size, so /25 gives 128 addresses.
Concrete. Volume is length × width × depth, converted to the same unit. Because of spillage and uneven ground, buyers usually order 5% to 10% extra, so treat the figure as a minimum and check with your supplier.
Unit conversion. Always convert using the exact factor and round only at the end. For example, 1 inch is exactly 2.54 centimetres, and rounding too early can add visible error across a long chain of conversions.