Result
$2,039.53 required per month for the entered retirement target
The current $500.00 monthly plan is $1,539.53 below the minimum whole-cent contribution that reaches the entered target in this constant-rate projection. This is a planning scenario, not financial advice or a sustainable-withdrawal guarantee.
- Current monthly contribution
- $500.00
- Additional monthly contribution needed
- $1,539.53
- Projected current plan
- $1,345,951.81
- Target at retirement
- $3,146,351.37
- Projection at required contribution
- $3,146,359.17
- Target in today's dollars
- $1,500,000.00
Hypothetical planning estimate only. Constant return, inflation, spending, income, contribution, and withdrawal assumptions are not guarantees. This model excludes fees, taxes, market sequences, lifespan, benefit changes, and personalized financial advice. Read the full disclaimer.
More
At a glance
- Cost
- Free
- Login
- Not required
- Best use
- Calculate the minimum whole-cent monthly contribution needed to reach an inflation-adjusted retirement spending target.
- Output
- Browser result with print and PDF options
- Reviewed
- 2026-08-09
Result summary
Quick answer
With the sample inputs, this calculator returns $2,039.53 required per month for the entered retirement target. Current monthly contribution: $500.00. Use $2,039.53 required per month for the entered retirement target as the first whole-cent fixed monthly contribution that reaches the modeled target, then test budget fit and more conservative assumptions.
This solves the monthly savings gap
The result is the smallest whole-cent fixed nominal monthly contribution whose unrounded projection reaches the modeled spending-based target. Use the Retirement Calculator for the broader target-versus-trajectory view.
Publisher Published by EverydayCalc Editorial Editorial standards and limitations
Each calculator shows its formula and defines the inputs. Worked examples make the math checkable. The page also names the limits that can change the result.
Last calculation review:
Review scope: formula implementation, example parity, visible assumptions, source links, and result presentation. This is editorial and calculation QA, not professional financial, tax, legal, medical, engineering, or safety review.
Results are estimates based on the inputs provided and the assumptions shown on this page. For financial, tax, legal, medical, or other high-stakes decisions, verify results with a qualified professional or official source.
Instructions
How to use this calculator
Open the short walkthrough for choosing and checking inputs.
The calculator inflates the part of retirement spending not covered by entered nonportfolio income, divides it by the entered withdrawal rate, and searches for the smallest whole-cent fixed monthly contribution whose unrounded projection reaches that future target.
Page guide
On this page
Jump directly to the part of the calculator you need.
Calculation details
Formula and methodology
See the exact math used to produce the result.
Required monthly savings = the smallest whole-cent fixed nominal contribution whose unrounded projection reaches the inflation-grown spending target at retirement age.
Before acting
Assumptions to check
Review the real-world details that can change the estimate.
The key inputs are Current age, Planned retirement age, Current retirement savings, Current monthly contribution, Desired annual retirement spending (today's dollars), annual spending, non-portfolio income, withdrawal assumption, return, inflation, and timing. The solver tests unrounded projections and rounds the required fixed nominal contribution up to the first sufficient cent.
More guidance Examples, methodology, and planning checks Open the worked example, review notes, reference tables, and practical next checks.
When to round up
The target test uses unrounded projections and proves that one cent less misses whenever a positive contribution is required. Displayed money rounds to cents. Contributions remain flat in nominal dollars, and taxes, fees, market sequence, changing benefits, and changing spending are excluded.
When to use this calculator
- Working backward to the fixed monthly contribution needed for a retirement target
- Checking whether the current contribution reaches the target
- Testing the first sufficient whole-cent contribution under one scenario
Tips for better estimates
- Use the same assumptions as the retirement target you are comparing.
- Verify the amount still fits the monthly budget.
- Rerun after balance, income, spending, rate, or retirement-age changes.
How this calculator is reviewed
This page is checked for inputs, formulas, examples, assumptions, topic fit, and related links. For this calculator, the review also covers current and retirement ages, current savings and contribution, spending, non-portfolio income, return, inflation, withdrawal assumption, whole-cent threshold, fees, taxes, and changing cash flow.
The sample result is covered by automated tests, and the page links to related calculators and, where available, supporting guides so readers can check the assumptions before acting. If a formula, label, or assumption looks off, send the page URL and your inputs through the contact page.
Sources to verify assumptions
Use these official and consumer-reference sources to check the terms and rules behind the inputs. The calculator result still depends on the values and method you select.
Worked example
Example inputs: Current age: 35; Planned retirement age: 65; Current retirement savings: $100000; Current monthly contribution: $500 /month; Desired annual retirement spending (today's dollars): $60000 /year; Expected annual pension, Social Security, or other income (today's dollars): $0 /year; Planning withdrawal rate: 4 %; Assumed annual return: 7 %; Assumed annual inflation: 2.5 %; Contribution timing: End of each month. With those values, the calculator returns $2,039.53 required per month for the entered retirement target. The current $500.00 monthly plan is $1,539.53 below the minimum whole-cent contribution that reaches the entered target in this constant-rate projection. This is a planning scenario, not financial advice or a sustainable-withdrawal guarantee.
Example scenarios
- Use $2,039.53 required per month for the entered retirement target as the first sufficient whole-cent contribution under the entered target and growth assumptions.
- Compare the required amount with the current monthly plan, then test whether the difference fits the household budget.
- Rerun the calculation after a balance update, missed contribution, spending change, benefit estimate, or retirement-age change.
Quick reference chart
| Sample result | $2,039.53 required per month for the entered retirement target |
|---|---|
| Current monthly contribution | $500.00 |
| Additional monthly contribution needed | $1,539.53 |
| Projected current plan | $1,345,951.81 |
| Target at retirement | $3,146,351.37 |
| Best next step | Use the whole-cent amount as a modeled savings target, then test whether it fits the budget and rerun the plan for missed deposits, lower returns, higher inflation, fees, taxes, or a changed retirement age. |
FAQs
Retirement Savings Gap Calculator questions
Is this the same as the Retirement Calculator?
No. The Retirement Calculator shows where the current plan may land at a selected age. This page solves the minimum fixed monthly contribution for an entered spending target.
Does this decide the right retirement spending target?
No. You enter spending, other income, and the withdrawal-rate assumption. The result only solves the contribution required under those inputs.
Why can the required contribution differ from my current plan?
The current plan may project below or above the entered target. This page searches all whole-cent monthly amounts and reports the smallest one whose unrounded projection reaches it.
Are taxes, fees, and changing Social Security benefits included?
No. Verify benefit estimates, account fees, contribution limits, taxes, healthcare, and current program rules separately.
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Common planning mistakes
Rounding the needed contribution down, using assumptions that differ from the target, ignoring budget feasibility, treating fixed nominal deposits as permanent, and omitting fees, taxes, and market risk.
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If this calculator helps a blog post, classroom resource, forum answer, seasonal guide, or local planning page, link to the canonical calculator URL so readers can run their own numbers and check the assumptions.
EverydayCalc.org, "Retirement Savings Gap Calculator", last updated August 9, 2026, https://everydaycalc.org/calculators/retirement-savings-gap-calculator/Was this calculator helpful?
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