Retirement calculator
Estimate how a lump sum plus monthly contributions could grow over time, before inflation and fees.
Estimated future value
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Compound growth: (current savings, grown at your rate) + (monthly contributions, grown month by month). It doesn't account for inflation, fees, taxes, or changing returns — a real projection needs those.
Use this calculator to compare a starting savings balance and equal monthly contributions under a constant return assumption. Save the inputs beside each result and separate money put into the model from modeled growth. The output is a hypothetical future value, not a finding that you can retire or that a contribution is suitable for your household.
This explanation adds a private assumptions worksheet and a checked one-variable scenario comparison to the existing calculator. It does not recommend an investment, account type, contribution amount or retirement age. Valora is not a registered investment adviser and is not arranging advisor matches or introductions at this time.
The live model converts the assumed annual percentage into a monthly rate by dividing it by twelve. It rounds years times twelve to the nearest whole number of months. For each modeled month, the existing balance grows at that same monthly rate and an equal contribution is added at the end of the month.
The formula is the future value of the starting balance plus the future value of equal end-of-month contributions. At a zero-return input, the contribution portion is simply the monthly amount times the number of months. This is a timing convention, not a statement about when you actually save or what an investment pays.
The model uses a constant rate and a constant contribution throughout. Its displayed annual return is not an effective annual yield calculation: monthly compounding of the annual percentage divided by twelve is the implementation. Do not substitute an investment's quoted yield without checking what that quote means and which assumptions you want to compare.
The Investor.gov compound-interest tool also presents initial investment, monthly contributions, estimated interest rate and compounding frequency as separate inputs. It is background for distinguishing those concepts, not evidence that two tools use identical formulas or will give identical outputs. The scenarios below are calculated with Valora's own served formula.
Keep five fields with every comparison. You can write them in a private note without sending balances or statements through a public form. The worksheet makes the result reproducible and leaves real-world account questions outside the arithmetic.
Write down the hypothetical starting amount and what you intend it to represent. If it comes from a current record, keep the date beside it. Do not add an uncertain future payment into the starting balance without labeling that change. A scenario starting amount is not a finding about money available for withdrawals.
Write the amount entered and label it as an assumption. The calculator adds the same amount at each modeled month-end. If your actual contributions vary, stop or arrive at different times, note that mismatch. It does not check what you may contribute to a particular account or whether the amount fits household cash flow.
Save the years entered and the constant annual percentage. The model rounds the period to whole months. An assumed percentage is an input, not a forecast or an endorsed rate. A longer period or a higher return can change the number without answering whether either assumption is reasonable for you.
Calculate the starting balance plus the hypothetical monthly contributions over the modeled months. Keep that amount beside the ending value. The difference is modeled growth, which can be negative when the assumptions produce a loss. It is not guaranteed interest or a measure of investment skill.
Write the one input you changed and why you are comparing it. Then list what is not modeled: taxes, fees, inflation, changing returns, withdrawals, account rules and contribution changes. Record which question needs a separate review before a real decision. A neatly saved output should not erase those exclusions.
These are fictional arithmetic examples, not recommended returns or savings amounts. Each starts with $10,000, uses 20 years or 240 modeled months, adds contributions at month-end and rounds displayed dollars to the nearest whole dollar. There are no withdrawals, fees, taxes or inflation in these examples.
| Scenario | Monthly input | Annual return input | Starting balance plus contributions | Ending value | Modeled growth |
|---|---|---|---|---|---|
| A: baseline assumption | $500 | 6% | $130,000 | $264,122 | $134,122 |
| B: change return only | $500 | 3% | $130,000 | $182,359 | $52,359 |
| C: zero-return arithmetic check | $500 | 0% | $130,000 | $130,000 | $0 |
| D: change contribution only from A | $300 | 6% | $82,000 | $171,714 | $89,714 |
Compare A with B to isolate the constant-return assumption: the starting balance, contribution and time stay the same. Compare A with D to isolate the equal monthly contribution assumption. The difference between those outputs is a model comparison, not a recommendation to choose a rate or increase saving.
Scenario C checks that, with no growth, the output equals the starting balance plus contributions. It is not a worst-case scenario. Negative returns can produce lower results, and actual changing returns are outside this constant-rate model.
The starting balance is included in the "starting balance plus contributions" column, so that column does not mean all the money was newly saved during the 20 years. In A, $120,000 of hypothetical monthly contributions is added to the $10,000 starting amount. The growth column subtracts that combined amount from the unrounded ending value, then rounds for display.
If two results differ in balance, contribution, period and return, you cannot tell which change explains the difference without another comparison. Start with a labeled baseline, duplicate its assumptions and change one input. Keep the reason for the comparison beside the saved result.
This method makes the arithmetic easier to explain. It does not turn the baseline into the right plan. You can explore a different assumption without deciding that it is affordable, permitted by an account or likely to occur. Keep those findings separate.
If the real question is irregular saving, a period without contributions or withdrawals before the end date, this model does not directly represent that sequence. Do not hide the sequence inside an average monthly number and call the result a cash-flow projection. Ask what additional analysis is needed and label any shortcut you use.
The result is a nominal dollar amount under the inputs. Inflation is excluded. A future balance therefore does not, by itself, tell you what that money will buy or what household spending it will support.
The inflation calculator is a related existing tool for an inflation-assumption question. It is not automatically integrated with this savings model. Record its inputs separately and do not add or subtract two outputs without explaining the comparison you intend to make.
Fees and taxes are also excluded from the savings-growth calculation. Do not label the ending value "after-tax retirement income" or assume that a particular account will make it available on the modeled date. The worksheet's missing-review field is there to keep those questions visible.
The calculator does not compare the balance with your actual future spending, choose a withdrawal strategy or model how returns arrive over time. It cannot establish that savings will last or supply a safe retirement date. A large-looking ending value is still only the answer to the inputs you entered.
For a separate fixed-withdrawal model, the how long savings will last calculator has a different purpose and its own limits. Its constant-return result is not evidence of lifelong security. The retirement calculator collection helps locate related tools without implying that their outputs form one complete plan.
If you compare tools, read each tool's assumptions rather than treating the labels as interchangeable. The compound-interest calculator addresses a related growth question, but this page's added value is the monthly-contribution worksheet and scenario explanation for this existing retirement-growth model. Choose the tool that matches the question, then keep its assumptions with the result.
You can bring the saved worksheet to a conversation by saying which assumption you compared and what remains unresolved. Ask how a professional would review household cash flow, account constraints and the factors this model leaves out. Request the written work product, costs, exclusions and follow-up rather than expecting a calculator screenshot to stand in for a plan.
Keep the question and a list of records separate from confidential documents. Ask how records should be shared securely after independently checking the professional and scope. A Valora inquiry requests information for a response; it does not book an appointment, recommend an investment or arrange an advisor introduction.
Use retirement savings growth as a transparent comparison of a starting balance, equal month-end contributions, time and a constant return assumption. Keep the inputs, money put in and modeled growth together. The comparison can prepare a useful question, but account rules, purchasing power, costs and a retirement decision still need their own review.
It models a starting balance and equal end-of-month contributions at a constant monthly rate equal to the annual percentage divided by twelve. Years times twelve is rounded to whole months. At zero return, the contribution portion is the monthly amount times the modeled months. It excludes inflation, fees, taxes, withdrawals and changing returns.
No. They are fictional inputs used to demonstrate the served model and isolate one change at a time. They are not forecasts, recommended rates or evidence of what an investment will earn.
Add the starting balance to the equal monthly contributions over the modeled months. Subtract that combined amount from the illustrative ending value. The difference is modeled growth, not guaranteed interest; the starting balance is not a new contribution made during the period.
No. It checks the arithmetic when no growth is assumed. Negative returns can produce lower results, and changing real-world returns are outside this constant-rate model.
No. It does not compare the result with your actual spending, choose withdrawals, check account rules or model changing returns, taxes, fees and purchasing power. A hypothetical future value is not a retirement decision.
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