Simple & Compound Interest Calculator

Simple & Compound Interest Calculator Online | Advanced Financial Tool by CALBD CALBD · Smart Interest Calculator Light / Dark Simple & Compound Interest Calculator Calculate simple and compound interest, view detailed breakdowns, and keep a history of your calculations with this modern financial calculator. Interest settings Switch between simple and compound interest with one […]

Calculator

Simple & Compound Interest Calculator Online | Advanced Financial Tool by CALBD
CALBD · Smart Interest Calculator

Simple & Compound Interest Calculator

Calculate simple and compound interest, view detailed breakdowns, and keep a history of your calculations with this modern financial calculator.

Interest settings
Switch between simple and compound interest with one click.
Currency
% p.a.
Years
Current mode: Simple interest
Simple interest
Awaiting input
Total amount
Principal + interest
Interest share
Interest vs principal
Principal share
Interest share

Breakdown & insights
View tables, formulas, history and analytics for your calculations.
Analytics & learning
No breakdown yet
Run a calculation to see year‑by‑year or month‑by‑month interest details.
Period Opening balance Interest Closing balance
Calculation time: ms Total calculations: 0

Simple interest formula

I = P × R × T

Where:

  • P = Principal amount (initial investment or loan)
  • R = Annual interest rate (in decimal, i.e. % ÷ 100)
  • T = Time in years

Simple interest grows linearly with time and is always calculated on the original principal only.

Compound interest formula

A = P × (1 + r / n)n × t

Where:

  • A = Future value (principal + interest)
  • P = Principal amount
  • r = Annual interest rate (decimal)
  • n = Number of compounding periods per year
  • t = Time in years

Compound interest grows faster because interest is periodically added back to the balance and itself earns interest.

Total saved calculations: 0

Tips

Click any history item to reload its values into the calculator. Use “Add to favorites” to tag important scenarios for quick access.

Formula

Add formula and method from ACF "Calculator Details".

Example

Example input and output can be added in the content block above.

FAQ

Simple & Compound Interest Calculator Online | Advanced Financial Tool by CALBD
CALBD · Smart Interest Calculator

Simple & Compound Interest Calculator

Calculate simple and compound interest, view detailed breakdowns, and keep a history of your calculations with this modern financial calculator.

Interest settings
Switch between simple and compound interest with one click.
Currency
% p.a.
Years
Current mode: Simple interest
Simple interest
Awaiting input
Total amount
Principal + interest
Interest share
Interest vs principal
Principal share
Interest share

Breakdown & insights
View tables, formulas, history and analytics for your calculations.
Analytics & learning
No breakdown yet
Run a calculation to see year‑by‑year or month‑by‑month interest details.
Period Opening balance Interest Closing balance
Calculation time: ms Total calculations: 0

Simple interest formula

I = P × R × T

Where:

  • P = Principal amount (initial investment or loan)
  • R = Annual interest rate (in decimal, i.e. % ÷ 100)
  • T = Time in years

Simple interest grows linearly with time and is always calculated on the original principal only.

Compound interest formula

A = P × (1 + r / n)n × t

Where:

  • A = Future value (principal + interest)
  • P = Principal amount
  • r = Annual interest rate (decimal)
  • n = Number of compounding periods per year
  • t = Time in years

Compound interest grows faster because interest is periodically added back to the balance and itself earns interest.

Total saved calculations: 0

Tips

Click any history item to reload its values into the calculator. Use “Add to favorites” to tag important scenarios for quick access.

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