Retirement Monthly Contribution Required Calculator

📖 Overview

Use this tool to back-solve monthly savings needed for your retirement objective.

Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.

This computes required monthly contribution to reach a target future value from current savings and expected return.

The Formula

Monthly PMT = (FV − PV × (1+r)ⁿ) × r ÷ [(1+r)ⁿ − 1]

FV	Target future value (retirement nest-egg goal)
PV	Current savings balance
r	Monthly return rate = Annual rate ÷ 12 ÷ 100
n	Number of months until retirement

💡Starting early is the most powerful lever. Contributing $400/mo at 7% for 30 years yields the same result as $1,400+/mo over just 15 years.

Goal	Current $0, 7%, 30yr	Current $50k, 7%, 30yr	Current $100k, 7%, 20yr
$500k	$409/mo	$191/mo	$706/mo
$1M	$817/mo	$599/mo	$1,412/mo
$1.5M	$1,226/mo	$1,008/mo	$2,118/mo
$2M	$1,634/mo	$1,416/mo	$2,824/mo

Use this tool when you need a fast decision during active planning or execution.
Use this before committing money, time, or tradeoffs that are hard to reverse.
Use this to compare options using the same assumptions across scenarios.

Results can be misleading if key inputs are missing, stale, or unrealistic.
Very small or very large values may amplify rounding effects and interpretation risk.
If assumptions change mid-decision, recalculate before acting.

💡 Revisit assumptions annually.

💡 Use multiple return assumptions for conservative planning.

💡 Run a best-case, base-case, and worst-case scenario before deciding.

💡 Use recent real values, not ideal assumptions, for better accuracy.

❓ Why can required contribution be zero?

Current savings plus growth may already meet your target.

❓ Is return guaranteed?

No, market return is uncertain and this is a projection.