Calculator Inputs
Example Data Table
| Scenario | Goal | Start | Rate | Term | Frequency | Timing |
|---|---|---|---|---|---|---|
| Starter savings goal | 50,000 | 5,000 | 7.0% | 5 years | Monthly | End |
| Faster plan | 50,000 | 10,000 | 6.0% | 4 years | Monthly | Beginning |
| With one-time boost | 80,000 | 8,000 | 7.5% | 6 years | Biweekly | End |
These examples show inputs only. Your results depend on your selections above.
Formula Used
When payments are constant and no one-time amount is added, the calculator uses the standard future value model:
- End-of-period payments: FV = PV(1+r)n + PMT × (( (1+r)n − 1 ) / r)
- Beginning payments: FV = PV(1+r)n + PMT × (( (1+r)n − 1 ) / r) × (1+r)
For payment increases and one-time contributions, it simulates each period and finds the payment that reaches the goal using a binary search. Rates are converted to a per-payment rate using an effective annual rate.
How to Use This Calculator
- Enter your target future value and your current balance.
- Choose an annual rate, optional annual fee, and compounding frequency.
- Set the term and how often you plan to contribute.
- Select whether contributions happen at the beginning or end of each period.
- Optional: add an annual payment increase and a one-time contribution.
- Click Calculate to see the required payment and schedule preview.
- Use the CSV and PDF buttons to export your plan.
If you are unsure about the rate, run multiple scenarios to see how sensitive the payment is to small changes.
Define the goal and timeline
A target term payment plan starts with three numbers: current balance, desired future value, and the deadline. For example, starting with $10,000 and aiming for $50,000 in 10 years sets the requirement. Payment frequency matters because monthly, biweekly, or weekly deposits create different period counts. Choose a start date so the schedule aligns with cash flow.
Translate annual rate into per-payment rate
The calculator converts an annual rate into a per-payment rate based on compounding and payment frequency. Monthly compounding with monthly payments often yields a per-payment rate near APR/12, but daily compounding can be slightly higher. If you include an annual fee, the model reduces the net annual rate before building the schedule. The effective annual rate is shown to compare scenarios on the same basis.
Payment sizing and sensitivity
With constant payments and end-of-period timing, the payment uses the future value annuity relationship. In the example above, a 6% annual rate requires about $194 per month. If the rate drops to 5%, the payment rises to roughly $216, an increase of about 11%. Shortening the term is more demanding: fewer periods means less time for compounding to work. This is why small changes in rate or time can shift the required payment.
Using increases and one-time boosts
If your income is expected to grow, an annual increase (such as 3% per year) can reduce the starting payment while still reaching the target. One-time deposits, placed at a chosen period, can also lower the ongoing payment because they act early in the growth curve. Use these features to match reality: bonuses, tax refunds, or planned windfalls.
Reading the schedule and validating the plan
The schedule lists each period’s deposit, any one-time amount, interest earned, and the ending balance. Compare cumulative contributions with the ending balance to see how much comes from growth versus saving. Run three cases—base, optimistic rate, and conservative rate—then select a payment you can maintain under conservative assumptions month after month.
FAQs
What is a target term payment?
It is the periodic deposit required to reach a chosen future value by a specific date, given a starting balance, rate assumptions, and payment frequency.
Why does the required payment sometimes show as zero?
If your current balance can grow to the target with the assumed rate and term, additional deposits may not be needed. Try a lower rate or shorter term to stress test.
How does “Beginning” versus “End” timing affect results?
Beginning timing assumes payments happen at the start of each period, giving deposits slightly more time to earn interest. This usually reduces the required payment compared with end timing.
What does an annual increase change?
It raises each payment over time by a fixed annual percentage. This can lower the first payment, but later payments become larger, which may better match growing income.
How are weekly and biweekly terms handled?
When you enter a term in years or months, the calculator estimates the number of weekly or biweekly periods from the calendar. Downloads include the full period-by-period schedule used.
Should I use a nominal rate or an effective rate?
Use the annual rate you expect to earn, then choose the compounding that matches the account. The tool also shows an effective annual rate to help compare options consistently.