Everyday Calculators — Age, Dates, Tips & Hours
15 live calculators · free, instant & privateTime & Date
Age calculatorFree, instant and private — runs entirely in your browser.Open calculator →Time calculatorAdd/subtract durations, hours between times, decimal hours for payroll.Open calculator →Date difference calculatorDays between two dates, including a working-days-only count.Open calculator →Countdown CalculatorLive days, hours, minutes and seconds to any date — with working days left and event presets.Open calculator →Business Days CalculatorUS federal and UK bank holidays built in, plus custom weekend patterns.Open calculator →Days between dates calculatorExact gap in days, weeks and business days — or add days to a date.Open calculator →
Food & Dining
Tip calculatorFree, instant and private — runs entirely in your browser.Open calculator →Grocery Budget calculatorFree, instant and private — runs entirely in your browser.Open calculator →Bill split calculatorFree, instant and private — runs entirely in your browser.Open calculator →Pizza Party calculatorhow many pizzas to order, any sizeOpen calculator →
School & Grades
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About these calculators
Small questions come up constantly — how old exactly, how many days until, what's a fair tip, how many hours did I work this week. These everyday tools answer them instantly and completely. The age calculator gives your precise age in every unit down to live-ticking seconds, plus your next-birthday countdown and life milestones like your 10,000th day.
They're deliberately simple on the surface and thorough underneath: leap years, uneven month lengths and time zones are handled with calendar-exact arithmetic, so the answer matches what an official form or HR department would compute. As with everything on ListCalc, your inputs never leave your device.
More from ListCalc
Every category, same promise: runs in your browser, shows its math, never sees your numbers.