Mipango

Kikokotoo cha Riba

Tafuta kiasi cha mwisho na riba kwa riba sahili au riba mchanganyiko — inayochanganywa kila mwaka, nusu mwaka, robo mwaka, kila mwezi au kila siku.

Tumia desimali au sehemu kwa sehemu ya mwaka, k.m. 1.5

Tokeo

Weka thamani kisha bonyeza Kokotoa ili kuona tokeo.

Fomula

I=PrtI = Prt

Simple interest: principal × yearly rate (as a decimal) × years.

A=P(1+rn)ntA = P\left(1 + \frac{r}{n}\right)^{nt}

Compound interest: the rate is split over n periods a year, and interest earns interest.

Jinsi ya kutumia kikokotoo hiki

  1. Choose simple or compound interest and enter the starting amount, the yearly rate in % and the time in years.
  2. For compound interest, choose how often interest is added. Money is shown to 2 decimal places.

Mfano uliotatuliwa

1000 at 5% a year for 3 years, compounded yearly

r = 5% = 0.05, n = 1 and nt = 3.

A = 1000 × 1.05³ = 1157.625, which rounds to 1157.63.

Interest = 1157.63 − 1000 = 157.63; the effective annual rate is exactly 5%.

Maswali yanayoulizwa mara kwa mara

What is the difference between simple and compound interest?

Simple interest is only paid on the starting amount. Compound interest is also paid on interest already added, so it grows faster.

What is the effective annual rate?

The rate you really earn in a year once compounding is included — also called the APY. Monthly compounding at 5% gives about 5.1162%.