When to use this calculator
Estimate a balance after equal withdrawals under a constant-return assumption. A negative result means the simple schedule would have exhausted funds before the end.
Explore the savings & interest calculators for other questions in this topic. For a related calculation, use the Savings Goal Time Calculator: Find how many whole months of fixed contributions reach a savings goal without interest.
PUTTING IT INTO PRACTICE
Savings Drawdown Balance: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Starting balance | 12,000 |
| End-of-month withdrawal | 100 |
| Nominal annual return (%) | 0 |
| Months (integer) | 12 |
| Result | 10,800 currency units |
- Check the input labels and enter the example values above.
- Apply the relationship: Balance = start × (1+m)^n − withdrawal × ((1+m)^n−1)/m.
- The result is 10,800 currency units, rounded for display.
How to interpret your result
A negative result means the simple schedule would have exhausted funds before the end.
Match the quoted rate to its compounding convention. A nominal rate, effective annual rate and continuous rate are not interchangeable. Contribution timing also matters when interest is included in a future-value model.
Frequently asked questions
Is a future savings value a forecast?
It is a scenario based on your entered rate and contributions. Changing rates, fees, tax or interrupted payments can change the actual outcome.
When is the savings drawdown balance calculator useful?
Estimate a balance after equal withdrawals under a constant-return assumption. A negative result means the simple schedule would have exhausted funds before the end.
How do I use the savings drawdown balance calculator?
Enter starting balance, end-of-month withdrawal, nominal annual return (%), months (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Balance = start × (1+m)^n − withdrawal × ((1+m)^n−1)/m.
What should I check before using the result?
A negative result means the simple schedule would have exhausted funds before the end.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: compound interest ↗. This is a topic reference, not an external review or endorsement of this tool.
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