年齢計算機 – 生年月日から正確な満年齢を計算
生年月日を入力するだけで、満年齢、生まれてからの日数、月数、時間、秒数を安全・完全無料で算出します。
⚡ 年齢計算機 – 生年月日から正確な満年齢を計算
完全な暦法精度
うるう年や月ごとの日数の違いを正確に反映します。
瞬時のリアルタイム計算
ページを再読み込みすることなく一瞬で算出します。
100%ブラウザ内処理
入力データはサーバーに送信されず、手元の端末で安全に処理されます。
How It Works — Simple 4-Step Process
Find your precise age in four quick, easy steps without confusing manual calendar math.
Enter Your Date of Birth
Select your birth day, month, and year from the interactive calendar.
Choose Date to Compare
Defaults to today, or choose any historical past or future date.
Click Calculate
Our calculation engine compares the two dates with full leap year calibration.
Explore Lifetime Statistics
See your age in years, months, days, hours, minutes, and your next birthday countdown.
Common Uses for Our Age Calculator
People around the world rely on accurate age calculation for daily needs, legal milestones, and life planning.
Passport & Visa Applications
Verify exact age requirements for travel documents and government forms.
School & Sports Admissions
Check eligibility based on regional birthday cutoff dates.
Milestones & Next Birthday
Find out the exact day of the week and countdown for upcoming birthdays.
Infant Development Milestones
Track baby age accurately in weeks and months for medical checkups.
全15種類の精密計算ツールを見る
33言語に対応した高速で数学的に正確な計算ツール。
よくある質問
❓ How is exact age calculated with leap years?
Our calculator uses Gregorian calendar rules, adding 366 days for leap years (including century leap year checks) and adjusting for the varying number of days in each month.
❓ Is my birth date stored on any server?
No. All calculations run 100% client-side in your web browser. No personal birth details are ever sent to or stored on any server.
❓ Can I calculate how old I will be in the future?
Yes! Simply change the "Date to Compare" to any future date to see your exact age on that day.
❓ Can I include my exact birth time?
Yes, check "Exact Birth Time" to calculate your elapsed life down to the exact minute and second.