Savings Calculator
Estimate a future savings balance or work backward from a target amount. Enter a starting balance, monthly deposit, APY, and term in years and months, then compare deposits with projected interest over time.
Additional
How to use the savings calculator
Choose Future balance when you know what you can save and want to see where it could grow. Enter your starting balance, monthly deposit, APY, and the time the money will remain saved.
Choose Savings goal when you know the balance you want to reach. Enter the target, what you have already saved, the expected APY, and the time available. The calculator works backward to estimate the monthly deposit required.
The result separates your deposits from projected interest. Open Savings schedule for the growth chart, yearly balances, and CSV export.
APY is usually the right rate for a savings account
Annual percentage yield, or APY, expresses the annual return after accounting for compounding. If a savings account advertises a 4.5% APY, enter 4.5 and leave the rate type set to APY.
Do not take an advertised APY and apply another compounding frequency to it. The effect of compounding is already represented in the APY.
If you instead have a nominal annual interest rate, open Additional, change the rate type, and choose how often that rate compounds.
| Rate | What it represents | When to use it | Compounding input |
|---|---|---|---|
| APY | Effective annual yield after compounding | Use the APY advertised for a savings account | Already included in the APY |
| Nominal annual rate | Annualized stated rate before the full effect of compounding | Use when the stated rate and compounding frequency are both known | Daily, monthly, quarterly, semi-annually, or annually |
Monthly deposits and interest do different jobs
A savings balance grows from two sources: money you add and interest earned on the balance. Early in a plan, deposits often account for most of the increase. As the balance becomes larger, the same annual yield can produce more interest in currency terms.
That is why the result shows a balance mix instead of presenting the final balance by itself. A large projected balance may still consist mostly of money you contributed.
The growth chart shows the same relationship over time, making it easier to see when interest begins to account for a larger share of the balance.
Working backward from a savings goal
Savings Goal mode answers a different question: how much needs to be added each month to reach a target balance by the end of the selected term?
The calculation first projects the starting balance forward at the entered rate, then solves for the fixed monthly contribution needed to close the remaining gap.
If the starting balance already meets the goal, or is projected to reach it without new deposits, the required monthly deposit is zero.
Beginning versus end-of-month deposits
Contribution timing changes how long each deposit has to earn interest. A beginning-of-month contribution enters the balance before that month's growth step. An end-of-month contribution enters afterward.
Beginning-of-month deposits therefore receive one additional monthly growth period. The difference is usually modest at first but can become more visible over long terms.
Choose the timing that most closely matches when money normally reaches the account.
| Timing | Monthly order | Effect |
|---|---|---|
| End of month | Interest, then deposit | The new deposit starts earning during the next monthly period |
| Beginning of month | Deposit, then interest | Each recurring deposit receives one additional monthly growth period |
Why compound interest becomes more visible over time
Interest left in the account becomes part of the balance that can earn interest in later periods. That is compound interest.
The annual percentage does not need to rise for the amount of interest earned each year to increase. A constant rate applied to a larger accumulated balance can produce a larger currency amount of interest.
The yearly schedule separates cumulative deposits, cumulative interest, and the interest added during each period so that effect can be inspected directly.
Why the real account balance may be different
A projection needs stable assumptions, so the entered annual rate and monthly deposit are held constant. Real savings-account rates can change, and promotional or balance-tier rates may apply only under specific conditions.
Financial institutions may calculate interest from daily balances and credit it on their own schedules. This calculator converts the annual return to an equivalent monthly growth rate so recurring monthly deposits can be modeled consistently.
Fees, taxes, withdrawals, irregular deposits, and inflation are not included. When the future rate is uncertain, comparing several rate scenarios is more useful than treating one long-term projection as a promise.
| Item | Calculator assumption | What may differ |
|---|---|---|
| Annual rate | Held constant for the full term | Savings-account rates can change |
| Monthly deposit | The same amount is added every month | Actual deposits may change or be skipped |
| Interest timing | Uses an equivalent monthly growth rate | An institution may calculate interest from daily balances and credit it on its own schedule |
| Fees and taxes | Not deducted | Account costs or taxes can reduce the amount retained |
| Inflation | Shows future nominal currency | Future purchasing power may be different |
Savings rates and investment returns are not interchangeable
A savings-account projection models interest credited to a deposit balance. An investment can rise or fall in value and may involve changing returns, fees, dividends, taxes, and loss of principal.
Using an expected investment return as though it were a guaranteed savings APY can make a projection look more certain than the underlying investment really is. Use a savings rate here when the money is being modeled as cash savings.
Savings formulas
The annual return is converted to an equivalent monthly rate, then the balance is processed month by month. Savings Goal mode uses the same monthly model to solve for the recurring deposit required.
- Entered APY as a decimal
- Effective annual yield calculated from a nominal rate
- Nominal annual interest rate as a decimal
- Nominal compounding periods per year
- Equivalent monthly growth rate
- Projected balance after month m
- Starting balance
- Monthly contribution
- Number of months in the projection
- Total amount deposited
- Projected interest
- Savings goal
Examples
Saving $200 a month for 10 years
Starting balance: $5,000; monthly deposit: $200; APY: 4.5%; term: 10 years; deposits at the end of each month.
Total deposits are $29,000. The projected balance is about $37,859.98, including about $8,859.98 of interest.
How much to save each month for a $50,000 goal
Savings goal: $50,000; already saved: $10,000; APY: 4%; term: 5 years; deposits at the end of each month.
The required monthly deposit is about $571.68. Under the entered assumptions, total deposits are about $44,301.02 and projected interest is about $5,698.98.
Beginning versus end-of-month deposits
Starting balance: $0; monthly deposit: $100; APY: 12%; term: 1 year.
Beginning-of-month deposits grow to about $1,276.65. End-of-month deposits grow to about $1,264.65.
Beginning timing gives every deposit one additional monthly growth period.
Nominal 5% interest compounded monthly
Starting balance: $10,000; monthly deposit: $0; nominal annual rate: 5%; monthly compounding; term: 1 year.
The effective annual yield is about 5.1162%, producing a projected balance of about $10,511.62.
A term that does not end on a full year
Starting balance: $10,000; monthly deposit: $250; APY: 4%; term: 1 year 6 months.
The 18-month projected balance is about $15,233.39, made up of $14,500 in deposits and about $733.39 in interest.
Frequently Asked Questions
What is the difference between APY and an interest rate?
APY reflects the annual effect of compounding. A nominal annual interest rate does not. If a savings account advertises APY, use APY mode.
Can I use this for a high-yield savings account?
Yes. Enter the account's advertised APY. If the APY is variable, remember that the real rate may change after the calculation is made.
How do I calculate how much I need to save each month?
Switch to Savings goal, enter the target amount, what you have already saved, the expected APY, and the time available. The result estimates the fixed monthly deposit required.
Can I enter years and months?
Yes. The term can run from 1 month through 100 years, so periods such as 18 months or 5 years 6 months do not need to be rounded to a whole year.
Can the APY be 0%?
Yes. At 0% APY, the projected balance is the starting balance plus scheduled deposits, and projected interest is zero.
Can I start with no savings?
Yes. Enter 0 for the starting balance and build the projection entirely from monthly deposits.
Why does beginning-of-month timing produce a higher result?
The deposit enters the balance before that month's interest step, so each recurring contribution receives one additional monthly growth period.
Does this calculator use compound interest?
Yes. Interest remains in the projected balance, so it can contribute to later interest calculations. The result separates accumulated interest from money deposited.
Will the result exactly match my bank statement?
Not necessarily. Actual accounts may use daily balances, specific crediting dates, changing rates, tiered rates, fees, or other account rules that are not reproduced by this monthly projection.
Does the calculator include taxes or inflation?
No. Interest is shown before any applicable tax, and future balances are not adjusted for inflation.
What if my bank uses AER or another effective annual rate?
If the quoted rate is an effective annual rate that already includes compounding, use APY mode and enter that annual effective rate. Check the account disclosure when the terminology is unclear.
Does changing the currency convert the amounts?
No. Currency selection changes how amounts are displayed. Keep every amount in one consistent currency.
What is included in the CSV export?
The CSV includes each yearly period, months elapsed, currency, projected balance, cumulative deposits, cumulative interest, and interest earned during that period.