Investment
Total amount due or received
The combined form avoids computing interest separately when all you need is the final figure.
The Formula
A = P + I = P(1 + rt)
The combined form avoids computing interest separately when all you need is the final figure.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| A | Final amount | currency | Principal plus all interest over the term. |
What Each Symbol Means
Acurrency
Final amount
Principal plus all interest over the term.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate simple interest page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Simple Interest, filed under Finance. Every number the guide produces comes from substituting into this one line.