Numarly

Retirement Calculator

Estimate how much wealth you can build for retirement.

What is it?

Retirement planning estimates the corpus you'll build by investing a fixed monthly amount from now until your retirement age, based on an expected rate of return.

Formula

FV = P × [((1+r)^n − 1) / r] × (1+r)

Where P = monthly investment, r = monthly return, n = number of months until retirement

Formula Explanation

This is the same SIP future-value formula applied over the specific window between your current age and retirement age. The number of months is calculated directly from the age gap, so a larger gap between current and retirement age gives compounding significantly more time to work.

Example Calculation

Starting at age 30, investing $15,000/month until retiring at 60 (30 years) at 12% return builds a corpus of roughly $52,900,000, from $5,400,000 invested.

How to Use

  1. Enter your current age and planned retirement age.
  2. Enter your monthly investment amount.
  3. Enter the expected annual return.
  4. View your projected retirement corpus and total amount invested.

Benefits

  • Frames retirement planning around your actual age gap rather than an arbitrary duration.
  • Shows how much of the final corpus comes from contributions vs. compounding growth.
  • Easy to experiment with different retirement ages to see the impact.

Use Cases

  • Setting a realistic monthly SIP target for retirement based on your timeline.
  • Comparing how retiring 5 years later changes your projected corpus.
  • A starting point before using the Financial Freedom calculator to check if the corpus is sufficient.

What Your Result Means

The retirement corpus is your projected total savings at your target retirement age, assuming consistent monthly investing at the stated return. Compare this figure against the Financial Freedom calculator's "required corpus" (25× annual expenses) to see if you're on track.

Tips

  • Even a few extra years of investing time can dramatically increase your corpus due to compounding.
  • Combine with a Step-Up SIP approach as your income grows over your career.
  • Cross-check your target corpus against the Financial Freedom calculator's 25x-expenses benchmark.

Common Mistakes

  • Not accounting for inflation when setting a target corpus — today's "enough" may not be enough decades later.
  • Using an overly optimistic return rate for a multi-decade projection.
  • Starting retirement planning late and underestimating how much time affects the outcome.

FAQs

How much should I invest monthly for retirement?

This depends on your target corpus, current age, and years remaining until retirement — try adjusting the monthly amount here to see how it affects your final corpus.

Does this account for inflation?

No, this shows the nominal future value. Consider using the Inflation or Financial Freedom calculators alongside this one to plan for rising costs.

Should I increase my SIP over time?

Many investors use a Step-Up SIP, increasing contributions annually in line with income growth, to build a larger retirement corpus faster.

How do I know if my corpus target is enough?

Use the Financial Freedom calculator to estimate your required corpus based on your expected monthly expenses in retirement (using the 25x annual expenses rule), then compare it to your projected corpus here.

This calculator provides estimates based on the expected return you enter. Actual investment returns vary with market performance.

Last updated: July 25, 2026