Compound Interest Calculator — Final Amount & APY
See how a single deposit grows with compound interest. Pick how often the interest compounds — daily for crypto/stocks, monthly for HYSAs, quarterly for bonds.
Year 1 book value = purchase price minus first year depreciation.
Year 1 book value = purchase price minus first year depreciation.
A 5% rate compounded daily yields 5.1267% APY; compounded monthly it is 5.116%; annually, 5.0%. The difference is small at low rates, but at 20% or higher, daily compounding can add 0.5-1% extra per year. For practical purposes, monthly is the right default for most savings accounts.
How this calculator works
When straight-line depreciation applies
Straight-line is the most common depreciation method for financial reporting and taxes. Other methods (declining balance, sum-of-years digits) front-load depreciation but are more complex. GAAP and IRS both accept straight-line for most assets.
Compound Interest Calculator — Final Amount & APY
See how a single deposit grows with compound interest. Pick how often the interest compounds — daily for crypto/stocks, monthly for HYSAs, quarterly for bonds.
Year 1 book value = purchase price minus first year depreciation.
Year 1 book value = purchase price minus first year depreciation.
A 5% rate compounded daily yields 5.1267% APY; compounded monthly it is 5.116%; annually, 5.0%. The difference is small at low rates, but at 20% or higher, daily compounding can add 0.5-1% extra per year. For practical purposes, monthly is the right default for most savings accounts.
How this calculator works
When straight-line depreciation applies
Straight-line is the most common depreciation method for financial reporting and taxes. Other methods (declining balance, sum-of-years digits) front-load depreciation but are more complex. GAAP and IRS both accept straight-line for most assets.