Health
Calculate pregnancy due date based on last period or conception date
due-date-calculatorMath & Numbers
Calculate electricity costs based on power consumption and usage time
electricity-calculatorValidation
Validate email addresses and check deliverability
email-validatorMath & Numbers
Convert between different energy units (joules, calories, kilowatt-hours, BTU, etc.)
energy-converterFinance
Check if a string is an Ethereum address. Does not validate address checksums.
eth-address-validatorMath & Numbers
Convert between different force units (newton, pound-force, kilogram-force, dyne, etc.)
force-converterSecurity
Generate hash values (MD5, SHA1, SHA256, SHA512)
hash-generatorDevelopment
Encode and decode HTML entities
html-entity-encoderNetwork
Convert integers (128-bit) to IPv6 addresses. Supports batch conversion.
integer-to-ipv6Network
Convert IPv4 addresses to IPv6 addresses. Supports IPv4-mapped and IPv4-compatible formats.
ipv4-to-ipv6Network
Convert IPv6 addresses to integers (128-bit). Supports batch conversion.
ipv6-to-integerHealth
Calculate optimal macro nutrient distribution based on goals and calories
macro-nutrient-calculator