Formula
Monthly saving = (goal − current savings × (1 + monthly rate)^months) × monthly rate ÷ ((1 + monthly rate)^months − 1). If the rate is 0, monthly saving = (goal − current savings) ÷ months.
Savings Calculator
Estimate the monthly saving needed to reach a goal from current savings, time to goal and optional interest rate.
Worked example
Goal 10,000, current savings 1,500, 24 months and 3.5% annual interest gives a monthly rate of 0.035 ÷ 12. Current savings grow to about 1,608.83. The remaining future value is 8,391.17, so the equal monthly deposit is about 338.06.
Professional note
Master’s Tip: print the report twice—once with the expected rate and once with 0% interest. The 0% version is the conservative cash-only target, while the interest version depends on the account actually earning that rate.
Regional and unit assumptions
Standard or basis: future-value savings arithmetic with end-of-month deposits and monthly compounding. No tax, banking, pension, investment or government-benefit rule is claimed.
Assumptions and limitations
- Savings contributions are treated as equal monthly end-of-month deposits.
- Interest is estimated with monthly compounding from the entered annual rate.
- The result is before tax, fees, inflation, bonus interest conditions or account limits.
- If current savings can already reach the goal under the assumptions, the required monthly saving is shown as zero.
- This is planning arithmetic only, not financial advice.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Monthly saving = (goal − current savings × (1 + monthly rate)^months) × monthly rate ÷ ((1 + monthly rate)^months − 1). If the rate is 0, monthly saving = (goal − current savings) ÷ months.
Standard or basis
Standard or basis: future-value savings arithmetic with end-of-month deposits and monthly compounding. No tax, banking, pension, investment or government-benefit rule is claimed.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
Master’s Tip: print the report twice—once with the expected rate and once with 0% interest. The 0% version is the conservative cash-only target, while the interest version depends on the account actually earning that rate.
Related calculators
Questions
How do I calculate how much to save each month?
Subtract the future value of your current savings from the goal, then divide the remaining future value across the monthly contribution formula. With no interest, divide the remaining amount by the number of months.
Does this calculator include interest?
Yes, if you enter an annual interest rate. The page converts it to a monthly rate and compounds monthly. Enter 0 if you want a cash-only savings target.
Are deposits assumed at the start or end of each month?
This calculator assumes deposits are made at the end of each month. Start-of-month deposits would earn slightly more interest.
What if I already have enough saved?
The required monthly saving is shown as zero when current savings can already meet the target under the entered assumptions.
Does this account for tax or inflation?
No. Tax, fees, inflation and account rules are not included. Use the result as a planning estimate and check real account terms before relying on it.
Calculation note
Savings-goal arithmetic turns a future-value formula into a practical planning question: how much needs to be set aside each month so a target amount is available later?
A savings goal is a future-value problem
The target amount is the future value. Current savings may grow toward it, and regular deposits add more future value over time. The calculator shows those pieces separately so the result is not a black box.
Contribution timing matters
This page assumes monthly deposits happen at the end of each month. If deposits are made at the beginning of each month, each deposit has one extra month to earn interest, so the required deposit can be slightly lower.
Interest is not the same as certainty
A fixed formula can show the effect of an entered rate, but real savings accounts may have changing rates, tax withholding, fees, bonus conditions or withdrawal limits. That is why the printable report keeps the rate and assumptions beside the result.
Why a zero-interest check is useful
A 0% scenario shows the cash contribution needed without relying on earnings. Comparing it with the interest scenario gives a quick sense of how much the plan depends on the rate assumption.
Sources and further readingInvestor.gov: Compound Interest CalculatorConsumer Financial Protection Bureau: Savings