Math & Numbers
Generate Fibonacci sequence with customizable start numbers, length, and output format. Includes golden ratio analysis and mathematical properties.
fibonacci-generatorMath & Numbers
Calculate sum of numbers with partial sums, cumulative sums, and statistics
sum-calculatorMath & Numbers
Calculate what day of the week a given date falls on
day-of-week-calculatorMath & Numbers
Convert between Arabic numbers and Roman numerals with validation and detailed results
roman-numeral-converterMath & Numbers
Convert between different density units (kg/m³, g/cm³, lb/ft³, etc.)
density-converterMath & Numbers
Calculate electricity costs based on power consumption and usage time
electricity-calculatorMath & 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-converterMath & Numbers
Advanced scientific calculator with support for complex mathematical functions and expressions
scientific-calculatorMath & Numbers
Calculate statistical measures for numerical datasets including mean, median, mode, standard deviation, and more
statistics-calculatorMath & Numbers
Calculate tips and split bills between multiple people with customizable tip percentages
tip-calculator