doomath Calculator
Compound Interest Calculator
Model compound growth with starting capital and recurring contributions.
InputsChange a value to recalculate instantly
ResultUpdates as you type
PHYSICAL SIMULATOR
Financial Compound Growth & Milestone Simulator
LIVE ENGINE 60FPS
Exponential Compound Growth Curve
Interactive compounding trajectory showing principal vs. earned interest acceleration over time.
Compounding Acceleration Active
FORMULA & STEPSCompound Interest Calculator — Mathematical Derivation & Steps
4 StepsSequential Calculation Breakdown
1
Initial Principal & Periodic Parameters
Identify starting balance, periodic contribution, nominal monthly compounding rate and total periods.
2
Lump Sum Compounding Growth
Calculates the future value of the initial lump sum alone.
3
Annuity Future Value of Contributions
Compounded return on the recurring monthly deposits over time.
4
Total Portfolio Valuation
Final combined balance across the full investment horizon.
λ DooMathWork with this calculation
Local · deterministic · optionalQuick mathNatural-language-style shortcuts for deterministic arithmetic.
Calculator guide
How to use the Compound Interest Calculator
Model compound growth with starting capital and recurring contributions.
01Set inputsChoose values, units and assumptions.
02Apply the modelUse the stated mathematical relationship.
03Read the resultCheck the output against the assumptions before using it.
What this calculator does
Model compound growth with starting capital and recurring contributions.
Formula & method
The result is calculated from the inputs and assumptions shown in the calculator.
Assumptions & notes
Review the inputs, units and assumptions before using the result for a real decision.