Math & Numbers
Convert days to weeks with configurable decimal precision
days-to-weeksMath & Numbers
Convert whole days to exact calendar years from a specified start year
days-to-yearsMath & Numbers
Convert US cups to US fluid ounces with configurable decimal precision
cup-to-ozMath & Numbers
Convert decimals into simplified fractions or mixed numbers with configurable tolerance and denominator limits
decimal-to-fraction-calculatorFinance
Calculate debt payoff plan using the snowball method (pay smallest balance first)
debt-snowball-calculatorMath & Numbers
Calculate what day of the week a given date falls on
day-of-week-calculatorMath & Numbers
Convert between different data storage units (bit, byte, KB, MB, GB, TB, etc.)
data-storage-converterDate & Time
Check if date ranges overlap with each other
date-overlap-checkerDate & Time
Validate if dates are within a specified range
date-range-validatorMath & Numbers
Calculate the digital root of numbers. The digital root is the recursive sum of digits until a single digit is obtained.
digital-root-calculatorMath & Numbers
Convert US cups to liters with configurable decimal precision
cup-to-literMath & Numbers
Group exponent λ(n) from prime factorization with φ(n) comparison, primitive-root existence, Korselt's Carmichael-number detection, and optional sample-unit verification.
carmichael-function