9 Free Tools + Life Planning
Every way to measure
your time, free.
Nine free tools covering your exact age, retirement countdown, birthday planning and your kids' ages — plus the milestone badges, share cards and life stats built around them. No sign-up, instant answers.
🧭 Calculators
Exact Age Calculator
Years, months, days, hours, zodiac & birthday countdown.
Age
Date Difference
Exact years, months, days, hours between any two dates.
Date
How Old Was I On…?
Your exact age on any past date in history.
Age
Chinese Age
Traditional East Asian age reckoning.
Age
Half-Birthday
Your exact half-birthday date.
Age
Days Until Birthday
Countdown to your next birthday with a progress bar.
Date
Retirement Countdown
Exact days left until your target retirement age.
Life
Baby Age Tracker
Track your baby's age in weeks, months and days.
Life
Day of Week Finder
What day of the week was any date in history?
DateAge Gap Calculator
Your exact age gap, plus the “half your age plus 7” rule.
Relationships
🗺️ Life Planning
Milestone Badges
Unlock badges for epic day milestones.
Life
Share Your Age Card
Design and share a beautiful age card.
Life
Life Stats
Heartbeats, meals eaten, Earth orbits — the fun math behind your exact age.
Life
Newsletter
Get milestone reminders and new tools in your inbox.
Life
📖 Guides
Finance & Planning
Retirement Age Calculator: UK, US and Europe 2026 Guide
UK State Pension age is 66 rising to 67. US Social Security FRA is 67 for those born 1960+. Every European country explained.
Finance & PlanningWhat Age Can You Retire in the US? Full 2026 Retirement Age Guide
A deep dive on US retirement age rules, Social Security timing strategy, and how to plan around it.
Calculator GuideAge Calculator: How to Calculate Your Exact Age
The formula, common mistakes, and why leap years trip up manual math.
Calculator GuideHow Old Am I? Calculate Your Age From Your Birthday
Why your birthday alone isn't enough — you need the full date of birth.
Calculator GuideHow to Calculate Age on a Specific Date
A worked example for computing age as of any date, not just today.
Calculator GuideAge Difference Calculator: How to Calculate the Exact Age Gap
The formula and a worked example for the gap between two people.
Calculator GuideHow Many Days Have I Been Alive?
Why leap years add extra days, and day-count milestones worth knowing.
Calculator GuideHow Many Weeks Have I Been Alive?
Why 'weeks lived' is a popular way to visualize an entire life.
Calculator GuideHow Old Was I on a Specific Date?
Dating old photos and historic events — find your age on any past day.
Calculator GuideHow Many Months Old Am I?
Why straight day-based math gets it wrong.
Calculator GuideHow Many Days Between Two Dates?
Inclusive vs exclusive counting, explained.
BirthdayHow Many Days Until My Birthday? Free Birthday Countdown Calculator
The psychology of birthday timing, global traditions, and the most common birth dates in the UK and US.
BirthdayWhat Day of the Week Was I Born? Find Your Birth Day Free
Why Tuesdays are the most common birth day, and the Doomsday Algorithm explained.
ParentingAge Calculator for Kids: Baby Age Tracker, Weeks, Months & Milestones
Developmental milestones by age, UK school readiness dates, and the relative age effect explained.
Culture & RelationshipsAge Gap Calculator: Does Your Relationship Pass the “Half Your Age Plus 7” Rule?
The internet's favorite dating-age formula, explained — plus a free calculator to check your own numbers.
Read the article → Lifestyle10 Things to Do the Week Before a Major Birthday
A practical checklist for the week before a major birthday.
Explore the other Agevly pillars