Calculators
Calculate Unix timestamps, evaluate math expressions, compute checksums and entropy, and work with percentages. Our developer calculators provide instant results with no page reloads — everything updates in real time as you type.
Timestamp Converter
Convert between Unix timestamps and human-readable dates
Math Evaluator
Evaluate mathematical expressions with variables and functions
Checksum Calculator
Calculate CRC checksums and validate Luhn numbers
Entropy Calculator
Calculate Shannon entropy and character frequency distribution
Percentage Calculator
Calculate percentages, percentage changes, and percentage of values