Savings Calculator

How to Use the Savings Calculator

Use this savings calculator to see how a starting balance and regular monthly deposits could grow over time, assuming a constant annual interest rate. Every figure is estimated in your browser — no data is sent anywhere.

1. Enter your initial deposit. Type the amount you already have set aside, such as 5,000. If you are starting from zero, leave it at 0 and rely on your monthly contributions.

2. Add a monthly contribution. Enter the amount you plan to add each month, for example 300. The calculator assumes the contribution is made at the end of every month.

3. Set the annual interest rate and time horizon. Enter the estimated annual rate of return, such as 4%, and the number of years you plan to save, for example 10. The projection assumes the rate stays constant.

4. Read the estimated results. The cards show your projected final balance, the total amount you contributed, and the estimated interest earned. A yearly breakdown table and a contribution-versus-interest bar help you see how compound growth builds over time. Use the copy button to save the summary.

What Is a Savings Projection?

A savings projection estimates how a balance could grow when interest is added to both your original deposit and the interest already earned — a process called compounding. The calculation uses the future value formula FV = P(1+i)^n + c x [((1+i)^n - 1) / i], where P is the initial deposit, c is the monthly contribution, i is the monthly interest rate and n is the number of months. When interest is paid monthly, the annual rate is divided by twelve and applied to the running balance each month. This is why the timing of deposits matters: money that stays invested longer earns interest for more periods, so early deposits do more work than later ones. A regular monthly contribution compounds too, because each new deposit starts earning interest as soon as it is added. The results shown here are only an estimate. They assume a constant annual return, no fees, no taxes and no withdrawals. Real savings accounts, bonds and investments change in value over time, and future returns are never guaranteed. This tool is for general information and planning only; it is not financial advice. Always check the terms of your own account and consider speaking to a qualified adviser before making decisions.

Common Applications

1. Preparing a home deposit. A couple contributes 500 per month at 3% for five years, starting from 10,000, and sees the estimated balance approach 42,000.

2. Building an emergency fund. Someone deposits 2,000 and then adds 150 per month at 2% for two years to estimate whether the cushion reaches a six-month expense goal.

3. Comparing scenarios. Changing the monthly contribution from 100 to 300 shows how much the extra saving effort weighs on the final balance.

4. Planning for education. Parents contribute 200 per month at 4% for eighteen years to estimate the capital available when studies begin.

5. Simulating a long horizon. Comparing 10 and 30 years with the same contributions shows how much compounding matters over extended periods.

How Compound Interest Grows Your Savings

Compound interest is interest that itself earns interest. In the first year the gains look modest, because they are calculated on a still-small balance. As the interest is added to the capital, the base grows larger and each year's gain increases. Over long periods this effect becomes striking: the second half of a savings horizon can produce more interest than the first half.

This is why time is as important an ingredient as the amount contributed. Doubling the horizon does not merely double the interest — in many cases it multiplies it by far more.

Regular Contributions vs. a Single Deposit

A single deposit placed early enjoys the greatest number of compounding periods and can therefore outweigh the sum of contributions spread over the same horizon. Contributing regularly, however, matches the pace at which most people actually save and smooths the effect of changing rates.

The calculator lets you test both approaches. Enter a large amount as the initial deposit with no contribution, then compare it with a small deposit plus a monthly contribution to see which path reaches the goal sooner.

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Guides

• How Much Should I Save Each Month?