Everyday Calculators
Solve practical percentage, statistics, fuel and planning calculations locally.
Percentage Calculator
calculate a percentage of a value, percentage change, reverse percentage and increase or decrease scenarios.
Open tool →Secure Random Number Generator
generate unbiased cryptographically secure integers inside a chosen inclusive range.
Open tool →Arithmetic Mean Calculator
calculate count, sum, arithmetic mean, minimum and maximum from a pasted number list.
Open tool →Geometric Mean Calculator
calculate the geometric mean of positive values using logarithms to avoid avoidable overflow.
Open tool →Fuel Consumption Calculator
convert trip distance and fuel used into L/100 km, km/L, US MPG and imperial MPG.
Open tool →Date Duration Calculator
calculate signed elapsed days, hours, minutes and seconds between two local date-time values.
Open tool →ISO Week Date Calculator
convert a calendar date to its ISO week-year, week number and weekday without timezone ambiguity.
Open tool →Business Days Calculator
count Monday-through-Friday dates between two calendar dates with a clearly stated no-holiday rule.
Open tool →Calendar Quarter Calculator
identify the calendar quarter for a date, UTC-safe boundaries and elapsed or remaining days.
Open tool →Month Calendar Generator
generate a copyable monthly calendar with Monday-first or Sunday-first weekday ordering.
Open tool →Day of Year Calculator
calculate the ordinal day, days remaining and leap-year status for a calendar date.
Open tool →Weekday Occurrence Calculator
list every occurrence of a selected weekday within a calendar month using UTC-safe dates.
Open tool →Timezone Offset Converter
convert a wall-clock date and time between explicit UTC offsets without external timezone data.
Open tool →Date Offset Calculator
add or subtract days, weeks, months or years with UTC-safe validation and month-end clamping.
Open tool →Date Midpoint Calculator
calculate the exact UTC midpoint between two validated dates and times.
Open tool →Date Interval Overlap Calculator
calculate the exact overlap or gap between two validated UTC date-time intervals.
Open tool →Recurring Date Generator
generate a bounded sequence of UTC dates at a fixed daily or weekly interval.
Open tool →Nearest Weekday Calculator
move a weekend date to the nearest, previous or next Monday-through-Friday date.
Open tool →Month Boundary Calculator
find the first day, last day and day count for the month containing a validated UTC date.
Open tool →Simple Interest Calculator
Calculate principal interest and final balance using a transparent non-compounding formula.
Open tool →Compound Interest Calculator
Calculate compound growth from principal, annual rate, years and compounding frequency.
Open tool →Loan Payment Calculator
Estimate a fixed periodic loan payment from principal, annual rate and term length.
Open tool →Return on Investment Calculator
Calculate absolute gain and return on investment percentage from cost and final value.
Open tool →Profit Margin Calculator
Calculate gross profit and margin percentage from revenue and total cost values.
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