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Existing cash
Compound Savings Calculator
Project a savings balance from a starting deposit, monthly contributions, an annual savings rate and a fixed number of years.
Deposits and modeled interest
Separate the cash you deposit from the interest assumption so the real driver of growth remains clear.
Enter your figures, then press “Project the savings balance” to calculate your result.
No result yetComplete the fields and use the calculation button.
What compound savings growth means
The calculator applies one-twelfth of the entered annual rate each month and then adds the monthly contribution. It separates the ending balance into the starting amount, new deposits and modeled interest.
- The model compounds monthly at a constant entered rate.
- Actual deposit rates can change.
- The result separates money deposited from modeled interest.
Contribution and interest do different work
Showing both parts prevents a rate assumption from hiding an unaffordable savings pace.
Deposits
New cash
Interest
Modeled growth
Separate contribution power from rate effects
For short and medium saving periods, the amount deposited often drives more of the result than a small rate difference. The output keeps contributions visible so interest is not mistaken for the main source of progress.
Compare a zero-rate case with the entered rate. The gap shows exactly how much of the projection depends on credited interest rather than household cash flow.
Match the account to the deadline
A higher advertised return may come with withdrawal limits, conditions, market risk or a rate that can change. Money needed on a fixed date requires access and capital protection appropriate to that purpose.
Verify deposit protection, eligibility, balance tiers and early-withdrawal conditions from current official documents. This calculator models arithmetic only and does not compare products.
Update the projection when the rate changes
A constant rate keeps the calculation understandable, but actual savings rates can move. Recalculate after a material rate change, withdrawal or contribution adjustment.
Record the account, target, calculation date and assumed rate together. That makes the next review explainable and prevents a previous projection from being treated as a guaranteed maturity value.
- Starting balance
- New deposits
- Modeled interest
- Ending balance
Common questions about this calculator
Does this calculator guarantee the savings rate?
No. It holds the entered rate constant to explain the arithmetic. Actual rates, balance tiers, conditions and credited interest can change.
Why show deposits separately from interest?
The separation reveals how much progress comes from household contributions and how much depends on the rate assumption, which makes the projection easier to stress-test.