Math & Numbers
Convert decimals into simplified fractions or mixed numbers with configurable tolerance and denominator limits
decimal-to-fraction-calculatorDate & Time
Expand RRULE-based VEVENT recurrence into concrete occurrences and export them as JSON or a flattened ICS calendar
ics-calendar-recurrence-rule-expanderMath & Numbers
Evaluate fraction expressions, simplify results, and show decimal plus mixed-number forms
fraction-calculatorMath & Numbers
Convert miles per hour to kilometers per hour with configurable decimal precision
mph-to-kmhDate & Time
Calculate duration, time gap, and business-day differences between two timestamps in different time zones with DST awareness
timezone-duration-calculatorMath & Numbers
Convert Fahrenheit to Celsius with configurable decimal precision
fahrenheit-to-celsiusMath & Numbers
Convert feet to meters with configurable decimal precision
feet-to-meterMath & Numbers
Convert miles to kilometers with configurable decimal precision
miles-to-kmMath & Numbers
Convert inches to centimeters with configurable decimal precision
inches-to-cmMath & Numbers
Convert meters to feet with configurable decimal precision
meter-to-feetMath & Numbers
Estimate required sample size for proportions or means using confidence level, margin of error, and optional finite population correction
sample-size-calculatorMath & Numbers
Calculate z-scores, cumulative probability, tail probability, and interval probability for a normal distribution
normal-distribution-calculator