Why Each Life Phase Is Longer in Hijri Terms
Because the Hijri year contains approximately 354 days compared to 365 in the Gregorian year, every span of time measured in Hijri years is slightly longer than the same span in Gregorian years. This means your school years, your working life, and your retirement will each last more Hijri years than Gregorian years.
When planning education, career, and retirement, the length of each phase changes slightly between lunar and solar years. Using حساب فرق العمر بين شخصين for your ages at school start, first job, and expected retirement lets you compare how long each life stage lasts in both calendars — which affects how pension schemes, service bonuses, and benefits tied to years of service are calculated in Hijri-primary employment systems.
Planning Each Life Phase with Dual-Calendar Precision
Education: School and University Years
In most countries, school enrollment and graduation are governed by Gregorian dates. But in Saudi Arabia and some Gulf states, the academic calendar ties to both systems. A student who begins school in Hijri year 1410 and graduates university in 1432 has spent 22 Hijri years in formal education — which is approximately 21 years and 4 months in Gregorian terms. Knowing both figures matters when presenting credentials internationally.
Career: The Working Years
Most employment contracts, social security records, and professional licenses specify experience in years. For someone who worked in Saudi Arabia from 1430 H to 1460 H, that is 30 Hijri years of service — but approximately 29 Gregorian years. The discrepancy matters for immigration points systems, international licensing, and pension portability agreements between countries.
Retirement: The Final Phase
Retirement planning that crosses calendar systems requires careful calculation. A person who expects a 20-year retirement in Gregorian terms should understand that those same 20 years will have passed roughly 20 Hijri years and 7 months of their life. For families that observe inheritance rules tied to age or life expectancy calculations, this difference has legal and financial implications.
| Life Phase | Gregorian Duration | Hijri Duration |
|---|---|---|
| Primary school (6–12) | 6 years | 6 yrs 2 mo |
| Secondary school (12–18) | 6 years | 6 yrs 2 mo |
| University (18–22) | 4 years | 4 yrs 1 mo |
| Early career (22–40) | 18 years | 18 yrs 7 mo |
| Senior career (40–60) | 20 years | 20 yrs 7 mo |
| Retirement (60–80) | 20 years | 20 yrs 7 mo |
Calculate Your Life Phase Lengths in Both Calendars
Enter your ages at school start, first job, and expected retirement — see each phase in Gregorian and Hijri years side by side
