Save Calculator
Save calculator works out Deposit needed each period and Balance reached from Savings target, Amount already saved and Regular deposit. The default figures on this page give deposit needed each period of 150.83; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Rate per period = 0.33333333%, over 60 periods
- The 0 already saved grows to 0
- Deposits must supply 10000
- Deposit = that amount / annuity factor = 150.83 per period
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the save calculator calculates
Connects a starting balance, a regular deposit, an interest rate and a savings target: it solves for the deposit you need to make, for how long it will take to get there, or for the balance a given plan reaches, and splits the result into deposits and interest.
How to use this save calculator
Enter Savings target, Amount already saved, Regular deposit and How often you deposit. Deposit needed each period updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Deposit needed each period, Balance reached and Deposit periods needed.
The method follows Time-value-of-money identity FV = PV(1+i)^n + PMT[(1+i)^n - 1]/i, with the annuity-due factor (1+i) and 12 CFR Part 1030 (Regulation DD), Appendix A - Annual Percentage Yield Calculation.
Deposit needed: 12% a year compounded monthly, three monthly deposits example
With What do you want to work out?: deposit, Savings target: 1333.311, Amount already saved: 1000, Interest rate: 12, the calculator returns Deposit needed each period: 100, Total paid in: 300. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Deposit needed each period, Balance reached and Deposit periods needed. The inputs you can vary are Savings target, Amount already saved, Regular deposit, How often you deposit, Deposits are made and Interest rate.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to save $10,000 in 6 months?
Connects a starting balance, a regular deposit, an interest rate and a savings target: it solves for the deposit you need to make, for how long it will take to get there, or for the balance a given plan reaches. Open “How this is worked out” beside the result to see each step for your own figures.
How much a day to save $1000 a month?
On the figures this page opens with — savings target 1,333.311, amount already saved 1,000, interest rate 12% and how long you will save for 0.25 years — the deposit needed each period is 150.83. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What information do I need for the save calculator?
You need Savings target, Amount already saved, Regular deposit, How often you deposit, Deposits are made, Interest rate, That rate is and How long you will save for. The page opens with default figures that give deposit needed each period of 150.83, so you can see the scale before entering your own.
What does this save calculator show?
It shows Deposit needed each period, Balance reached, Deposit periods needed, Years needed, Months needed, Total paid in, Interest earned and Rate per deposit period, with the working and any warnings for your entries.
Can I check how the save calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.