🚀⚡Beginner

Find Compound Interest

Calculate compound interest

Compound Interest (CI) is interest calculated on both the initial principal and the accumulated interest from previous periods. It's called "interest on interest" and grows faster than simple interest.

📐 Formula

A = P × (1 + R/100)^T
CI = A - P

Final Amount

Principal

Rate (%)

Time (years)

📊 Simple vs Compound Interest (₹10,000 at 5% for 2 years)

Simple Interest

₹1,000

Compound Interest

₹1,025

C Program to Calculate Compound Interest

compound_interest.c

1#include <stdio.h>
2#include <math.h>  // For pow() function
3
4int main() {
5    float principal, rate, time, amount, ci;
6    
7    // Input values
8    printf("Enter Principal: ");
9    scanf("%f", &principal);
10    
11    printf("Enter Rate (%%): ");
12    scanf("%f", &rate);
13    
14    printf("Enter Time (years): ");
15    scanf("%f", &time);
16    
17    // Calculate: A = P × (1 + R/100)^T
18    amount = principal * pow(1 + rate/100, time);
19    
20    // Compound Interest = Amount - Principal
21    ci = amount - principal;
22    
23    printf("\nCompound Interest = %.2f\n", ci);
24    printf("Total Amount = %.2f\n", amount);
25    
26    return 0;
27}

Output

Enter Principal: 10000

Enter Rate (%): 5

Enter Time (years): 2

Compound Interest = 1025.00

Total Amount = 11025.00

📖 Code Explanation

Code	Explanation
#include <math.h>	Required for pow() function
pow(base, exp)	Calculates base raised to power exp
1 + rate/100	Convert percentage to decimal multiplier
ci = amount - principal	CI is the extra money earned