Savings Interest Calculator

See how compound interest grows your money over time. Compare banks, neobanks, and DeFi.

Simulation
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Currency
Inflation adjusted
Future Balance
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$0 earned in 30 years
Simulation of deposits at 6.00% APY

Compare Your Future Balance

Same deposit, same period — different rates.

¹ Revolut Standard plan. Up to 2.25% on Ultra.
² ING rate after 6-month promotional period.
³ EU average for traditional savings accounts (ECB, Oct 2025).

How This Savings Calculator With Monthly Deposits Works

This compound interest calculator with contributions lets you see how much your savings will grow over time across different providers — from traditional banks to neobanks and DeFi lending protocols. Enter your initial deposit, set up monthly deposits or other recurring contributions, choose a time horizon from 5 to 30 years, and adjust the interest rate to see results instantly.

The compound interest formula used is: FV = P × (1 + r)t + C × [((1 + r)t − 1) / r], where P is your principal, r is the annual rate, t is the number of years, and C is your annual contribution. Each year, interest is earned on your full balance including previously earned interest — that's the power of compounding.

All results update in real-time as you change any input. You can also toggle between USD and EUR, or enable the inflation-adjusted savings calculator mode to see your returns in today's purchasing power rather than nominal value.

Savings Interest Rates Compared

European savings interest rates as of February 2026
Provider Type Interest Rate (AER) Deposit Protection Access
unflat DeFi 4–7% Not government insured Instant
Revolut Neobank 2.00% €100K EU DGS Instant
ING Bank 1.25% €100K EU DGS Instant
Traditional Banks Bank 0.50% €100K EU DGS Instant

How Much Will $10,000 Grow at Different Rates?

The table below shows how a $10,000 initial deposit with $500 monthly contributions grows over time at different interest rates. These examples illustrate the power of compound interest and why even small differences in savings account interest rates lead to dramatically different outcomes over 10, 20, or 30 years.

Projected savings growth: $10,000 initial + $500/month contributions
Interest Rate After 5 Years After 10 Years After 20 Years After 30 Years
0.50% (Traditional Bank) $40,554 $71,880 $136,924 $205,294
2.00% (Neobank) $42,265 $77,888 $160,644 $261,522
4.00% (DeFi — conservative) $44,664 $86,839 $200,580 $368,944
6.50% (DeFi — high yield) $47,863 $99,738 $268,188 $584,393

After 30 years, the difference between a traditional bank at 0.50% and a DeFi yield of 6.50% is over $379,000 — from the exact same deposits. This is why choosing where to save matters. Use the savings interest calculator above to run your own numbers with your exact deposit amount and monthly contributions.

How Much Will My Savings Grow?

A compound interest calculator helps you see what most people underestimate: the exponential nature of long-term savings growth. When interest is compounded, you earn returns not only on your original deposit but also on every bit of interest accumulated before it. Over 10 or 20 years, this effect becomes dramatic.

How much interest will I earn on my savings? The answer depends on three things: the bank interest rate offered, how much you deposit, and — most importantly — time. A modest savings account interest rate of 2% looks small in year one, but over 30 years with monthly contributions, it produces a balance far larger than the sum of your deposits.

The difference between savings interest rates matters more than most people think. At 0.50%, savings growth over time is barely above what you put in. At 4–7%, compound interest transforms your deposits into a meaningfully larger sum. That gap widens every year, which is why comparing bank interest rates early makes such a big impact.

Use the savings calculator above to model your own scenario. Try different rates, switch between time horizons, and toggle inflation adjustment to see what your savings are really worth in today's money.

Frequently Asked Questions

How much interest will I earn on my savings?
It depends on your interest rate, deposit amount, and time horizon. At a traditional bank rate of 0.50%, $10,000 earns about $253 over 5 years. At 6.50% (DeFi lending), the same amount grows to $13,700. Use our calculator above to see your exact numbers.

What is a good savings account interest rate in 2026?
In Europe, traditional banks offer 0.3%–0.6%. Neobanks like Revolut and Trade Republic offer around 2.00%. High-yield options like DeFi lending protocols offer 4%–7%, though with different risk profiles. The ECB deposit facility rate is currently 2.00%.

How does compound interest work?
Compound interest means you earn interest on your interest. Your balance grows by the interest rate each year, and the next year's interest is calculated on the new, higher balance. The formula is: Future Value = Principal × (1 + rate)years. Over long periods, this creates exponential growth.

Is it safe to earn higher interest through DeFi?
DeFi lending protocols like those used by platforms such as unflat offer higher yields because borrowers must deposit more collateral than they borrow (overcollateralized). However, unlike bank deposits, these are not government-insured. Smart contract risk and stablecoin risk exist. Never deposit money you cannot afford to lose.

Why do banks pay so little interest on savings?
Traditional banks use your deposits for their own lending and investments, keeping most of the profit. They also have high overhead costs (branches, staff, compliance). Digital-first platforms and DeFi protocols have lower costs and can pass more yield to depositors.

What is the difference between APY and APR?
APR (Annual Percentage Rate) is the simple interest rate without compounding. APY (Annual Percentage Yield) includes the effect of compound interest, so it's always equal to or higher than APR. For savings accounts, APY gives you the true picture of what you'll earn. A 6% APR compounded monthly equals roughly 6.17% APY. When comparing savings accounts, always compare APY to APY for an accurate comparison.

What is the Rule of 72?
The Rule of 72 is a quick way to estimate how long it takes to double your money. Divide 72 by your interest rate, and you get the approximate number of years. At 2% interest, your money doubles in about 36 years. At 6%, it doubles in just 12 years. At a traditional bank rate of 0.50%, it would take 144 years. This simple rule shows why even small rate differences have an enormous impact over time.

How much should I save per month?
A widely cited guideline is the 50/30/20 rule: 50% of income for needs, 30% for wants, and 20% for savings and debt repayment. However, the right amount depends on your goals, income, and expenses. Even $100 per month at a 6% return grows to over $100,000 in 30 years thanks to compound interest. The most important step is to start — use the calculator above to see how your monthly contribution grows over time.

How often is interest compounded on savings accounts?
Most banks compound interest daily or monthly. DeFi protocols typically compound continuously or with each blockchain block. The more frequently interest compounds, the faster your balance grows. This calculator uses annual compounding for simplicity, which provides a conservative estimate. With daily compounding, your actual returns would be slightly higher than shown.