Compound Interest Calculator (Philippines, ₱)
Project the future value of your savings or investment with monthly contributions and any compounding frequency. Compare time deposits, MP2, mutual funds, and stocks in Philippine peso.
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Your investment growth
Year-by-year projection
| Year | Year Contributions | Cumulative Contributions | Interest Earned | Year-End Balance |
|---|
What is compound interest?
Compound interest is when you earn interest not just on your original investment but also on the interest you’ve already earned. Over time, this snowballs — your money grows exponentially rather than linearly. Albert Einstein reportedly called it “the eighth wonder of the world” because of how dramatically it changes long-term wealth-building outcomes.
In the Philippines, compound interest powers most savings and investment products: time deposits, Pag-IBIG MP2, mutual funds, UITFs, stocks, and even credit card balances (where it works against you).
The formula
A = P × (1 + r/n)^(n×t)
For monthly contributions:
FV = PMT × [((1 + r/n)^(n×t) − 1) / (r/n)]
Where:
A = Final amount
P = Principal (initial investment)
PMT = Monthly contribution
r = Annual interest rate (decimal)
n = Compounding frequency per year
t = Time in years
Typical Philippine investment returns
Use these benchmarks to estimate your potential returns:
| Investment Type | Typical Annual Return | Risk Level |
|---|---|---|
| Savings Account (BDO, BPI, Metrobank) | 0.10% – 0.25% | Very Low |
| Time Deposit (6 months – 5 years) | 2.00% – 5.00% | Low |
| Retail Treasury Bonds (RTBs) | 5.00% – 7.00% | Low |
| Pag-IBIG MP2 | 6.00% – 7.50% | Low |
| Money Market UITF/Mutual Fund | 3.00% – 5.00% | Low |
| Bond Fund (UITF/Mutual Fund) | 4.00% – 7.00% | Low-Medium |
| Balanced Fund | 6.00% – 9.00% | Medium |
| Equity Fund / Index Fund (PSEi) | 7.00% – 12.00% | Medium-High |
| Direct Stocks (Philippine PSE) | 8.00% – 15.00% | High |
| Cryptocurrency / Speculative | Highly variable | Very High |
Past returns are not guaranteed. Always read product disclosures before investing.
How compounding frequency affects returns
The more frequently your investment compounds, the more interest you earn. For example, on ₱100,000 invested at 7% for 10 years:
| Compounding Frequency | Final Value | Interest Earned |
|---|---|---|
| Annual (1×/year) | ₱ 196,715 | ₱ 96,715 |
| Semi-annual (2×/year) | ₱ 198,979 | ₱ 98,979 |
| Quarterly (4×/year) | ₱ 200,160 | ₱ 100,160 |
| Monthly (12×/year) | ₱ 200,966 | ₱ 100,966 |
| Daily (365×/year) | ₱ 201,360 | ₱ 101,360 |
Sample computations
Example 1: Time deposit ₱500,000 at 4% for 5 years (annual compounding)
- Final value: ₱608,326
- Interest earned: ₱108,326 (before 20% withholding tax)
- After-tax interest: ~₱86,661
Example 2: ₱5,000/month for 20 years at 8% (monthly compounding)
- Total contributions: ₱1,200,000
- Final value: ~₱2,948,000
- Interest earned: ~₱1,748,000 (more than your contributions!)
Example 3: Retirement savings — ₱10,000/month for 30 years at 7%
- Total contributions: ₱3,600,000
- Final value: ~₱12,200,000
- Interest earned: ~₱8,600,000 (240% return on contributions)
The “Rule of 72” — quick mental math
To estimate how long it takes for your money to double, divide 72 by the annual interest rate:
- At 3% (time deposit): 72 ÷ 3 = 24 years to double
- At 7% (MP2): 72 ÷ 7 = ~10 years to double
- At 10% (equity fund): 72 ÷ 10 = ~7 years to double
- At 12% (aggressive stock portfolio): 72 ÷ 12 = 6 years to double
Frequently asked questions
For low-risk savers, Pag-IBIG MP2 typically offers the best risk-adjusted return (6-7.5% historical, tax-exempt). For moderate-risk, index funds tracking the PSEi have averaged 7-10% over long periods. For very low risk, RTBs (Retail Treasury Bonds) offer 5-7% with government backing. Diversifying across these usually beats picking just one.
Mostly no. Interest income from bank deposits and most fixed-income products is subject to 20% final withholding tax. Exceptions: Pag-IBIG savings (Regular + MP2) are 100% tax-exempt by law, and certain long-term bonds (5+ year holding period) qualify for preferential rates. Capital gains from stocks held over 1 year on the PSE are also tax-exempt for personal investors.
For typical Philippine rates (3-10%), monthly compounding earns about 0.3-0.6% more per year than annual compounding. Small per year, but over 20-30 years the difference becomes meaningful. For example, ₱1M at 7% over 30 years: annual compounding = ₱7.6M, monthly = ₱8.1M — a ₱500,000 difference just from compounding frequency.
Mathematically, lump-sum investing usually wins because your money has more time to compound. However, peso-cost averaging (investing monthly) reduces the risk of buying at a peak price and is psychologically easier for most people. If you have a lump sum and the market is at all-time highs, splitting it over 6-12 months is a reasonable middle ground.
Philippine inflation averages 3-4% per year. To beat it, your investments need to earn at least 4-5% after taxes. Savings accounts (0.25%) lose money to inflation. Time deposits (2-4%) barely keep up. MP2, RTBs, and equity funds reliably beat inflation over long periods. The longer your horizon (10+ years), the more you should tilt toward equities/funds vs cash savings.
Starting late. A Filipino who invests ₱5,000/month from age 25 to 55 (30 years) at 7% will accumulate ~₱6.1M. The same person starting at age 35 to 55 (20 years, same monthly amount) accumulates only ~₱2.6M — less than half. Time is your single biggest advantage in compounding. Start small if you must, but start now.
Yes — when you carry unpaid credit card debt. Most PH credit cards charge 3-3.5% monthly interest (~36-42% annually), compounded monthly. A ₱50,000 unpaid balance becomes ₱70,000+ in 12 months if you only make minimum payments. Always pay credit card balances in full or use the BIR online lending interest calculator to see the true cost of borrowing.
APR (Annual Percentage Rate) is the simple annual interest rate. APY (Annual Percentage Yield) includes the effect of compounding within the year. For 6% APR compounded monthly: APY = (1 + 0.06/12)^12 − 1 = ~6.17%. Banks often advertise APR for loans (looks lower) and APY for deposits (looks higher). Always compare apples to apples.