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NPS / OPS Calculator

How to use the NPS to OPS comparison tool

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Updated 21 Apr 2026  ·  5 min watch  ·  By Manoj Parihar, HPFAS

This walkthrough shows how to use the NPS to OPS comparison tool to weigh your projected National Pension System outcome against the assured Old Pension Scheme pension, side by side, following DoPPW norms.

What this tool does

It projects your NPS corpus at retirement based on your contributions and years of service, converts a portion into an estimated annuity income, and compares that projected monthly figure against what OPS would guarantee at the same last drawn pay — so both options sit next to each other in the same terms.

What you'll need

  • Your current NPS contribution details and years already served.
  • Your projected or current basic pay at the comparison date.
  • An assumed rate of return for the NPS projection (a default is provided).

Reading your result

The result card shows your projected NPS monthly income alongside the OPS-equivalent pension, plus the underlying assumptions used for the projection so you can adjust them and see how sensitive the comparison is to contribution years or assumed returns.

NPS projections depend on assumed returns — OPS figures are fixed by rule. Treat the comparison as indicative, not a guarantee.
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Manoj Parihar, A Serving HPFAS officer
About the author
Manoj Parihar
A Serving HPFAS officer

The founder of HPFAS Insights is a seasoned HPFAS officer with nearly 25 years of hands-on experience in government accounting, pay fixations, pension revisions, and service regulations. Pairing decades of accounting expertise with a strong aptitude for modern technology, he focuses on designing smarter, optimized workflows for the accounting professionals, common government employees and general public. He created HPFAS Insights to share his extensive knowledge and practical wisdom with a community of professionals who value continuous learning.

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