Crypto Compound Interest Calculator

Project crypto portfolio growth with compound interest or staking reinvestment.

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Enter your values and click Calculate

Compound interest is the most powerful force in wealth building — and crypto staking, yield farming, and DeFi lending put it to work at yields rarely available in traditional finance. When staking rewards are reinvested rather than withdrawn, the return compounds exponentially rather than linearly. This calculator models that compounding effect for any combination of starting balance, annual yield, time horizon, and monthly contributions. Ethereum staking currently yields 3–5% APY; some DeFi lending protocols offer 8–15%; liquidity pool positions can reach higher. The inputs are flexible enough to model all of these scenarios. The outputs separate final portfolio value into two components — total capital contributed (principal plus all monthly additions) and total yield earned — letting you see precisely how much of your ending balance was generated by compounding rather than new deposits. The difference between holding 5 years versus 10 years at the same APY illustrates compounding's accelerating effect clearly: the second half of a holding period generates disproportionately more yield than the first half. This tool models the mathematics of compounding. Actual crypto yields are not guaranteed, fluctuate with protocol conditions, and carry smart contract risk and tax implications that this tool does not address. Use these projections for planning context, not as financial forecasts.

How It Works

Monthly rate r = APY ÷ 12. Total periods t = years × 12. Future Value of Principal = P × (1 + r)^t. Future Value of Monthly Contributions = PMT × [(1 + r)^t − 1] ÷ r. Total Portfolio Value = FV_principal + FV_contributions. Total Yield = Total Value − (Principal + PMT × t). Worked example: $10,000 at 12% APY, 5 years, $200/month contributions. r = 0.12 ÷ 12 = 0.01. t = 60 months. FV_principal = $10,000 × (1.01)^60 = $10,000 × 1.8167 = $18,167. FV_contributions = $200 × [(1.01)^60 − 1] ÷ 0.01 = $200 × 81.67 = $16,334. Total = $34,501. Total contributed = $10,000 + ($200 × 60) = $22,000. Yield earned = $34,501 − $22,000 = $12,501. The contributions formula is the future value of an ordinary annuity — each monthly addition earns interest for all remaining periods. Dollars deposited early compound for the full duration; dollars added in month 59 barely compound at all. This is why front-loading contributions has an outsized long-term impact.

Examples

DeFi Yield Farming
$10,000 at 12% APY for 5 years, adding $200/month.
Result: Final value: ~$34,500 on $22,000 contributed — $12,500 in earned yield.
Staking Only
$50,000 staked at 5% APY for 10 years, no extra contributions.
Result: Final value: ~$82,450 — $32,450 in yield earned purely through compounding.
Long-Term Compound Growth
$10,000 at 12% APY for 10 years with $200/month contributions.
Result: Final value: ~$79,000 on $34,000 contributed — yield exceeds total contributions, showing compounding acceleration in the second half.

Frequently Asked Questions

What is APY in crypto?
APY (Annual Percentage Yield) reflects the effective return including compounding. If a staking protocol distributes rewards daily and you reinvest them, your effective return is higher than the quoted base rate. For example, a 12% APR compounded monthly results in an effective APY of approximately 12.68%. Always check whether a protocol quotes APR (simple) or APY (compounded) to avoid overestimating returns — the distinction matters more at higher rates.
Is 12% APY realistic in crypto?
Some staking and DeFi protocols do offer 5–20% APY, particularly during periods of high demand for liquidity or when new protocols offer elevated rates to attract capital. However, higher yields typically carry higher risks — smart contract vulnerabilities, protocol insolvency, liquidation cascades, and impermanent loss are all real mechanisms through which DeFi yields can be partially or fully lost. Rates also fluctuate constantly as market conditions change; the APY you earn today may be half that rate six months from now.
How does this differ from traditional compound interest?
The mathematical formula is identical — both use the same future value of an annuity equation. The practical differences are that crypto yields tend to be higher but more volatile, staking rewards are often distributed more frequently (daily or continuously rather than monthly), and the underlying asset can itself appreciate or depreciate in USD terms. Traditional savings accounts offer predictable but low yields; crypto yields offer higher potential but introduce principal risk that a bank deposit does not carry.

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