CPF & EPF Compound Interest Calculator
Calculate compound interest on savings and investments. See how CPF Special Account at 4%, Singapore Savings Bonds, and regular contributions grow over time. Free, no signup.
Compound Interest Calculator Tool
| Year | Balance | Interest Earned | Total Contributions |
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How to Use the Compound Interest Calculator
Enter your principal
Type your starting amount. This could be existing savings, a lump sum, or an investment. For CPF projections, enter your current CPF Special Account or Ordinary Account balance.
Set rate and period
Enter the annual interest rate and how many years you plan to invest. Use the slider for quick adjustments. For CPF SA, enter 4%. For equities, enter your own long-run assumption — the tool does not supply one, and no market return is guaranteed.
Add a monthly contribution
Even small monthly top-ups dramatically increase your final amount. Leave at 0 if you are not adding regularly. Try entering S$200 or S$500 to see how consistent contributions change the outcome.
Read your results
See your final balance, total interest earned, and the visual breakdown chart. Click "Show year-by-year breakdown" to see exactly how your balance grows each year — useful for retirement planning milestones.
The Power of Compounding — Why Time Is Your Greatest Financial Asset
The Magic of Compounding: Einstein's Eighth Wonder
Compound interest is the process of earning interest not just on your original principal, but also on the interest you have already accumulated. It sounds simple, but the long-run effect is extraordinary. Consider the difference between simple and compound interest on a S$10,000 deposit at 6% annual interest over 20 years. With simple interest, you earn S$600 per year — a total of S$12,000 in interest, giving you S$22,000. With annual compounding, you end up with S$32,071 — nearly S$10,000 more, for doing absolutely nothing differently.
The effect accelerates as the time horizon lengthens. The same S$10,000 at 6% for 40 years produces S$102,857 with compounding versus S$34,000 with simple interest. This exponential divergence is why financial educators stress starting early above all else. The rate matters, but the time matters more.
The saying "compound interest is the eighth wonder of the world" is widely attributed to Albert Einstein — though no written primary source confirms this. Regardless of its origin, the mathematical truth stands: a modest sum left to compound for long enough will always outperform a larger sum started later. The Rule of 72 neatly captures this: divide 72 by your annual return and you get the approximate number of years required to double your money. At 4% (CPF Special Account rate), money doubles in 18 years. At 7%, it doubles in about 10.3 years.
"If you invest S$10,000 at 7% p.a. for 30 years, you end up with S$76,123 — without adding another dollar."
CPF vs Private Investment: What the Numbers Show
Singapore's Central Provident Fund is one of the most generous government-mandated savings systems in the world. The CPF Special Account (SA) pays 4% per annum — a floor rate the Government has extended every year since it was introduced in 2008, currently to 31 December 2026. The Ordinary Account (OA) pays 2.5% p.a. (its own legislated floor), and the MediSave and Retirement Accounts share the SA's 4% floor (CPF Board, July–September 2026 quarter).
Compare this with market returns, which are not guaranteed. Whatever long-run equity figure you assume, it carries volatile years, currency risk for SGD-based investors, fees, taxes and the behavioural difficulty of staying invested through downturns — and it is a nominal number, so subtract the inflation you expect before comparing it with CPF's 4%. A government-backed 4% with no drawdowns is a demanding hurdle for a risk-averse saver to beat after costs.
Malaysia's Employees Provident Fund (EPF) is a comparable scheme. Its Simpanan Konvensional dividend ranged from 5.20% (2020) to 6.90% (2017) over 2015–2025, with 6.30% declared for 2024 and 6.15% for 2025 (KWSP); dividends are declared each year and are not guaranteed. The EPF's strong historical performance makes it arguably the best default savings vehicle for Malaysian workers. The practical implication for Singaporeans: maximise CPF contributions and top-ups first, then invest surplus savings in diversified instruments such as Singapore Savings Bonds or low-cost index funds.
How ASEAN Savers Can Maximise Returns in 2026
Beyond CPF and EPF, ASEAN savers have an expanding toolkit of options. Singapore Savings Bonds (SSBs) offer step-up interest rates with full capital protection and monthly liquidity — ideal for emergency funds or risk-averse savers who want returns above the CPF Ordinary Account's 2.5%. The coupon steps up over the 10-year term, and MAS publishes the schedule for each monthly issue.
Robo-advisors such as Syfe and StashAway have lowered the barrier to globally diversified investing. For sums above your CPF and SSB allocations, a systematic monthly investment plan through a robo-advisor using dollar-cost averaging removes the need to time the market. Indonesian savers can look at BPJS Ketenagakerjaan and the ORI/SR retail government bonds, whose coupons are set at each issue. Thai workers enrolled in the Government Pension Fund (GPF) benefit from a matching contribution structure similar to employer CPF contributions in Singapore.
The universal lesson across all ASEAN markets: starting at 25 versus 35 with the same monthly contribution gives roughly twice the final balance at 65 at a 6–7% return (the 40-year annuity factor is about double the 30-year one), purely from the extra decade of compounding. Starting early is worth more than contributing more — though ideally, you do both.
The Rule of 72, an Einstein quote that isn't, and what CPF actually pays
Compound interest is often misattributed to Albert Einstein, who allegedly called it "the eighth wonder of the world" — no written source exists, but the sentiment is mathematically correct.
At 7% annual growth, money doubles roughly every 10.3 years — this is the Rule of 72: divide 72 by the interest rate to get the doubling time.
Singapore's CPF Special Account (SA) pays 4% p.a. — a floor rate extended each year since 2008, currently to 31 December 2026 (CPF Board).
Malaysia's EPF declared dividends between 5.20% and 6.90% a year over 2015–2025 (6.15% for 2025) — declared annually, never guaranteed (KWSP).
Starting to invest at 25 vs 35 with the same monthly contribution gives roughly 2× the final balance at 65 at a 6–7% return — purely due to time.
Daily compounding earns only marginally more than monthly compounding at typical savings rates — the frequency difference is far less impactful than rate or time horizon.
CPF interest is computed monthly and credited once a year, so "Monthly" compounding is the closer match for a CPF projection (CPF Board).
Singapore Savings Bonds (SSBs) offer step-up interest rates with full capital protection — ideal for risk-averse savers who want above-CPF OA returns.
The difference between 5% and 7% annual returns over 30 years on a S$100,000 investment is over S$300,000 — small rate differences compound dramatically.
Inflation at 3% p.a. halves your purchasing power in about 23 years — real returns (above inflation) matter more than nominal rates when planning for retirement.
Frequently Asked Questions
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Simple interest is calculated only on the original principal: interest = P × r × t. Compound interest is calculated on the principal plus all previously accumulated interest. Over time, this snowball effect means compound interest grows exponentially while simple interest grows linearly. For example, S$10,000 at 6% for 20 years: simple interest yields S$22,000; compound interest (annual) yields S$32,071.
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More frequent compounding produces slightly higher returns, but the difference is often overstated. Going from annual to monthly compounding on a 4% rate adds about 0.07 percentage points of effective annual return (4.00% becomes 4.07%). Going from monthly to daily adds almost nothing measurable. In practice, the compounding frequency matters far less than the rate itself and the length of your investment period. For CPF, interest is calculated monthly and credited annually.
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Use 4% for CPF Special Account (SA) and MediSave projections. Use 2.5% for CPF Ordinary Account (OA) projections. CPF Retirement Account (RA) also earns 4% p.a. Set compounding frequency to "Annually" for a conservative estimate. Note: CPF SA interest is actually calculated monthly and credited at year-end, so "Monthly" compounding is slightly more accurate.
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The rate is pegged, and the floor is a policy decision that has been renewed every year. The SA, MediSave and RA rate is reviewed quarterly as the 12-month average yield of 10-year Singapore Government Securities plus 1% (3.09% for May 2025–April 2026), subject to a floor of 4% p.a. that the Government has extended to 31 December 2026. The OA rate is the 3-month average of major local banks' rates, subject to a legislated 2.5% minimum. CPF savings are backed by the Singapore Government (CPF Board).
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Both are mandatory provident fund systems. CPF (Singapore) pays floor rates — 2.5% for OA and 4% for SA/MediSave/RA — on savings invested in Special Singapore Government Securities. Malaysia's EPF (KWSP) declares a dividend each year from actual investment returns; over 2015–2025 the Simpanan Konvensional dividend ranged from 5.20% to 6.90%. However EPF returns are not guaranteed and vary annually. CPF provides more certainty while EPF has delivered higher historical returns. Both are among the best pension systems in ASEAN.
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The Rule of 72 is a mental shortcut: divide 72 by your annual interest rate to estimate the number of years it takes to double your money. At 4% (CPF SA), doubling takes 72 ÷ 4 = 18 years. At 7% (approximate long-run equity returns), doubling takes about 10.3 years. At 2.5% (CPF OA), doubling takes about 28.8 years. It is a rough estimate — exact results require the compound interest formula — but it is useful for quick comparisons.
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Yes — with a simplification. SSBs have step-up rates (higher rates in later years), so a single average rate is not perfectly accurate. As an approximation, use the 10-year average yield published on the MAS website for your chosen SSB issuance, set frequency to "Annually", enter your investment as principal, and set years to 10. This gives a reasonable estimate. For precise SSB projections, use the official MAS SSB calculator at mas.gov.sg.
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Work backwards from the monthly income you want. For the CPF side, the CPF Board's CPF LIFE Estimator shows the payout your Retirement Account is projected to deliver from 65; the gap between that and your target is what private savings must fund. Use this calculator for that gap: enter current savings as principal, the monthly top-up you can sustain, your years to retirement, and a rate you are willing to defend — then read the year-by-year table to see when the balance crosses the figure you need. Change one input at a time to see which lever matters most.
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Yes, and it is important to account for this. This calculator shows nominal returns — the raw dollar amount. To estimate real (inflation-adjusted) returns, subtract the inflation you expect from your interest rate (SingStat publishes Singapore's CPI history). If you enter 7% and expect 2% inflation, your real return is about 5%; CPF SA at 4% against the same 2% is about 2% real. Inflation at 3% p.a. halves purchasing power in about 23 years.
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No. It computes nominal growth only, with contributions treated as arriving at the end of each compounding period and no withdrawals. Fund fees, platform charges, withholding tax on foreign dividends and inflation all reduce what you actually keep — enter a rate net of fees if you know it, and read the inflation question above for real returns. Everything runs in your browser; nothing you type is sent to a server.
Method & sources
How it computes
Future value with periodic contributions, A = P(1 + r/n)^(nt) + PMT·[((1 + r/n)^(nt) − 1)/(r/n)], evaluated year by year with the monthly top-up converted to a per-period contribution (×12/n); the zero-rate case is linear. Nominal growth only — no fees, tax or inflation.
What this tool implements
- Discrete compounding at n = 1, 2, 4, 12 or 365 periods a year; contributions treated as end-of-period (ordinary annuity)
- Zero-rate case handled as the r→0 limit of the annuity factor (linear accumulation)
- Reference rates quoted on the page: CPF OA 2.5% and SA/MediSave/RA 4% p.a. floors (CPF Board, July–September 2026 quarter; 4% floor extended to 31 Dec 2026)
- Rule of 72 quoted as an approximation of ln 2 ÷ ln(1 + r)
Sources
- Brealey RA, Myers SC, Allen F, Edmans A. Principles of Corporate Finance. 14th ed. New York: McGraw-Hill; 2022. Chapter 2, present and future value and annuities.
- cpf.gov.sg — earning attractive interest
- kwsp.gov.my — epf declares 6 15 dividend for simpanan konvensional and 6 15 for simpanan shariah
- mas.gov.sg — singapore savings bonds
What can make this go out of date
- CPF interest rates — CPF Board reviews the OA rate quarterly (3-month average of major local banks' rates, 2.5% legislated floor) and SA/MA/RA quarterly (12-month average 10-year SGS yield + 1%, 4% floor currently extended to 31 December 2026)
- EPF Simpanan Konvensional dividend — declared once a year by KWSP, typically late February/early March
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