Savings Goal Calculator
Calculate how much you need to save monthly to reach your savings goal. Account for starting balance and interest earned.
Reaching a $50,000 goal in five years from $5,000 saved at 4% interest requires saving $662 a month — and the $5,000 you already hold contributes $6,105 of the target on its own.
Calculator
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How This Calculator Works
The calculator determines the monthly savings needed to reach a target amount, accounting for compound interest on both existing savings and future contributions.
Worked example
Using the defaults — a $50,000 goal, $5,000 already saved, 4% interest, over 5 years:
With monthly compounding, r = 4% ÷ 12 = 0.003333 and n = 60 months.
Grow what you already have. $5,000 × (1.003333)^60 = $6,105. Your existing savings cover $1,105 of the goal through interest alone, doing nothing else.
Find the remaining gap. $50,000 − $6,105 = $43,895 that must come from new contributions and their own growth.
Solve for the payment. The annuity factor is ((1.003333)^60 − 1) ÷ 0.003333 = 66.30. Then $43,895 ÷ 66.30 = $662 a month.
Separate the two sources. You contribute $662 × 60 = $39,725. The remaining $50,000 − $5,000 − $39,725 = $5,275 comes from interest. The starting balance earns $1,105 of that and the contributions earn the rest.
Enter 50000, 5000, 4 and 5 above to reproduce the $662 monthly figure. Contributions are assumed to arrive at the end of each month, which is the conservative convention and produces a slightly higher required payment than month-start contributions.
The same $50,000 goal at different horizons
Compressing the timeline raises the monthly requirement sharply, because there is less time for compounding to do the work.
| Time to goal | Monthly needed | Total contributed | Interest earned | Growth share |
|---|---|---|---|---|
| 2 years | $1,787 | $42,899 | $2,101 | 4.2% |
| 3 years | $1,162 | $41,829 | $3,171 | 6.3% |
| 5 years (default) | $662 | $39,725 | $5,275 | 10.6% |
| 10 years | $289 | $34,672 | $10,328 | 20.7% |
Every row reaches exactly $50,000. The 2-year path requires $1,787 a month while the 10-year path requires $289 — a 6.2× difference for the same outcome. Time is the most powerful input a savings plan has.
Common mistakes with this calculation
- Assuming the interest rate is guaranteed for the whole period. A 4% rate is available today; it was 0.5% in 2021 and may be 1.5% again. For goals more than two or three years out, either assume a lower rate or accept that the required contribution will rise if rates fall.
- Forgetting that the goal itself inflates. A $50,000 house deposit in five years may need to be $58,000 if prices rise 3% a year. Saving toward today's price reaches a goal that has already moved. Set the target in future dollars.
- Saving toward a short-term goal in a volatile asset. Equities can fall 20% in the year you need the money. For goals inside five years, a high-yield savings account, money market fund, or short-term CD ladder protects the balance. Take risk with the horizon, not the goal date.
- Ignoring tax on the interest. Interest in a taxable account is taxed annually as ordinary income. At a 22% marginal rate, 4% becomes roughly 3.1% after tax, which raises the required monthly contribution. Use a tax-advantaged account where the goal allows.
When this calculator does not apply
- The rate is held constant for the whole term, which no savings product guarantees.
- It assumes every monthly contribution is made, on time, with no gaps or withdrawals.
- It ignores inflation, so the target is expressed in today's dollars.
- Tax is not modelled. Interest in a taxable account is worth roughly a fifth less at a 22% marginal rate.
- It assumes a single goal. Most households save for several at once, competing for the same monthly capacity.
Frequently Asked Questions
What interest rate should I use?
High-yield savings accounts typically offer 3-5% APY. For longer goals, you might invest for higher returns (7-10%) but with more risk.
Can I save less if I start earlier?
Yes. Starting earlier means more compound interest works in your favor, so you need to contribute less each month to reach the same goal.
Sources & Methodology
This calculator uses standard financial formulas. See our methodology page for the full formula derivation.
- Consumer Information on Saving Consumer Financial Protection Bureau
- Your Insured Deposits Federal Deposit Insurance Corporation
- National Rates and Rate Caps Federal Deposit Insurance Corporation
- Share Insurance Coverage National Credit Union Administration
- Consumer Price Index US Bureau of Labor Statistics
Last reviewed .
Key takeaways
- A $50,000 goal in five years from $5,000 at 4% requires $662 a month.
- Your starting $5,000 grows to $6,105 on its own, covering $1,105 of the target.
- Total interest earned over the plan is $5,275 — 10.6% of the goal.
- Compressing the timeline from 10 years to 2 years raises the monthly payment 6.2 times.
- For goals inside five years, protect the balance rather than chasing return.