💳 Interest Rate Percentage Calculator

Calculate the interest on your loan or investment with this easy percentage-based tool.

💡 What This Tool Does

Quickly find out how much interest you’ll pay or earn, based on:

Principal Amount ($): Annual Interest Rate (%): Time Period (Years):

Simple Interest Earned: $0.00

Total Future Value: $0.00

Principal Amount ($): Annual Interest Rate (%): Time Period (Years): Compounding Frequency:

Compound Interest Earned: $0.00

Total Future Value: $0.00

Effective Annual Rate (EAR): 0.00%

Principal Amount ($): Desired Future Value ($): Time Period (Years): Compounding Frequency:

Required Annual Rate: 0.00%

Total Interest Needed: $0.00

Interest = Principal × Rate × Time

Future Value = Principal + Interest

Example: $1,000 at 5% for 5 years
Interest = $1,000 × 0.05 × 5 = $250
Future Value = $1,000 + $250 = $1,250

Future Value = Principal × (1 + Rate/n)^n×Time

n = compounding periods per year

Example: $1,000 at 5% compounded annually for 5 years
Future Value = $1,000 × (1 + 0.05)⁵ = $1,276.28

Rate = n × [(FV / P)^1/(n×T) - 1]

Example: $1,000 → $1,276.28 in 5 years (annual compounding)
Rate = [(1276.28 / 1000)^1/5 - 1] = 5%

Principal	Rate	Time	Simple Interest	Compound Interest (Annual)
$1,000	5%	5 years	$250	$276.28
$5,000	7%	10 years	$3,500	$4,835.36
$10,000	3%	20 years	$6,000	$8,083.66

Interest =
Principal × Interest Rate × Time ÷ 100