Japan Basic Old-Age Pension

Calculate Japan's basic pension amount from contribution months and exemption months (FY2026 basis).

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Calculation basis and official references

Reviewed on:

Formula basis

Credited months = paidMonths + fullExemptMonths * 4/8 + threeQuarterExemptMonths * 5/8 + halfExemptMonths * 6/8 + quarterExemptMonths * 7/8. The full amount multiplied by credited months and divided by eligible months is rounded to the nearest yen.

Calculation method

Applies the credited proportions for paid months and each exemption category to the full basic old-age pension amount for fiscal 2026.

Exclusions and checks required

  • The different exemption credit rates before March 2009 and from April 2009 are not separated.
  • The ten-year eligibility period, contribution deferrals, student payment exceptions, retroactive payments, additional pension, and transfer addition are not evaluated.

Example input:：All 480 contribution months paid: JPY 847,300 annually

birthDate
1960-01-01
paidMonths
480
fullExemptMonths
0
threeQuarterExemptMonths
0
halfExemptMonths
0
quarterExemptMonths
0

The example result is JPY 847,300 annually. This is an estimate from the entered months, not an official amount based on the individual's pension record.

Official references

FAQ

Who is this calculator for? Japan Basic Old-Age Pension

Calculate Japan's basic pension amount from contribution months and exemption months (FY2026 basis).

What values should I enter?

Applies to: Japan Pension

How should I interpret this estimate?

Applies the credited proportions for paid months and each exemption category to the full basic old-age pension amount for fiscal 2026.

How to use

  1. Enter your input values and press Calculate.
  2. Review the result and compare it with expected context.
  3. Credited months = paidMonths + fullExemptMonths * 4/8 + threeQuarterExemptMonths * 5/8 + halfExemptMonths * 6/8 + quarterExemptMonths * 7/8. The full amount multiplied by credited months and divided by eligible months is rounded to the nearest yen.

Official references