Basic Interest Calculator

The amount borrowed, lent or invested.
A negative rate is permitted and produces negative interest.
Used only to convert a term given in days into a fraction of a year.
Enter this when solving for the rate, the principal or the time.
Interest
100.00
Simple Interest Calculator
Final amount
1,100.00
Principal
1,000.00
Annual rate
5.0000 %
Time
2.000000 year
Interest per day
0.1370
Interest per month
4.1667
Worked out from OpenStax, Elementary Algebra 2e - simple interest and proportional relationships and 1 other source.
Simple, non-compounding interest only: no fees, taxes, payments, variable rates or compounding.

How this is worked out

3 steps
  1. Term in years t = 2 + 0/12 + 0/365 = 2
  2. I = P x (r/100) x t = 1000 x (5/100) x 2 = 100
  3. A = P + I = 1000 + 100 = 1100

Results are general information, not financial, tax, legal, medical or engineering advice.