How this calculator works
Most savings calculators answer only half the question. You either know how much you can stash each month and want to know when you'll get there, or you have a hard deadline — a wedding, a down payment, a trip — and need to know how much to set aside. This tool does both, and crucially it accounts for the interest your savings earn along the way, which a back-of-the-envelope "goal divided by months" never does.
In "my monthly amount" mode, it counts the months until your balance — growing with interest as you go — reaches the goal. In "my deadline" mode, it solves for the exact monthly deposit needed, recognising that your existing balance keeps growing too, so you don't have to save the whole gap yourself. Either way, it shows how much of the goal comes from your deposits versus interest.
The method
The monthly growth rate is derived from your APY so the compounding matches a real savings account.
- Saving $500/month: you reach it in about 46 months, with roughly $2,600 from interest.
- Interest pulls the date forward: the higher your yield, the sooner you arrive on the same monthly amount.
- Your head start compounds: the $5,000 already banked keeps growing on its own, shrinking what you must contribute.
- The split: between your head start and interest, you personally deposit well under the full $30,000.
Acronyms used on this page
- APY
- Annual Percentage Yield
- CD
- Certificate of Deposit
Reaching it sooner — and safely
Three levers shorten the road to any goal: save more each month, start with more, or earn a higher yield. The first is the most powerful, but the third is the easiest to ignore — parking goal money in a checking account earning nothing leaves real time and money on the table when high-yield savings accounts and short-term CDs are available. For any goal you'll need within a few years, keep the money safe and liquid — a high-yield savings account, money-market account, or CD — rather than investing it, since a market dip right before your deadline could derail the plan. The single most reliable trick is to automate the monthly transfer so saving happens before you can spend it.
Frequently asked questions
How much should I save each month?
Set your deadline and this solves the exact monthly amount, counting growth on both your existing balance and ongoing deposits — so you don't save the full gap out of pocket.
How long will it take to save X?
Enter your goal, current savings, monthly amount, and rate, and it counts the months to the target. Interest shortens the timeline, so a higher-yield account gets you there sooner.
Where should I keep short-term savings?
For goals within a few years: a high-yield savings account, money market, or short-term CD — safe, liquid, and earning interest. Stocks are usually too risky for money you'll need soon.
Does the interest rate really matter for a few years?
Yes — it both shortens the timeline and covers part of the goal. On a multi-year goal, the difference between 0% and a few percent can be hundreds or thousands of dollars and several months.