Interest
Principal
Interest Rate
Time
Interest
Equation
I = Interest
p = Principal
r = Interest rate
t = Time (in years)
I
=
prt
I
=
p
⨯
r
⨯
t
I
=
I = prt
Works best on Firefox
Future Value of Single Amount
Present Value
Interest Rate per Compounding Period
Number of Compounding Periods
Future Value
Equation
FV = Future Value
pv = Present value
i = Interest rate per compounding period
n = Number of compounding periods
FV
=
pv
(
1
+
i
)
n
FV
=
pv
(
1
+
i
)
n
FV
=
pv
(
)
n
FV
=
pv
(
)
FV
=
FV = pv( 1+i )^{ n }
Works best on Firefox
Future Value of Annuity
Regular Deposit per Compounding Period
Interest Rate per Compounding Period
Number of Compounding Periods
Future Value
Equation
FV = Future Value
d = Deposit amount per compounding period
i = Interest rate per compounding period
n = Number of compounding periods
FV
=
d
(
1
+
i
)
n
−
1
i
FV
=
d
(
1
+
i
)
n
−
1
i
FV
=
d
(
a
)
n
−
1
i
FV
=
d
(
b
)
−
1
i
FV
=
d
1
⨯
c
i
FV
=
e
i
FV
=
FV = d {( 1+i )^{n} - 1} over {i}
Works best on Firefox
Present Value of Single Amount
Future Value
Interest Rate
Number of Compounding Periods
Present Value
Equation
PV = Present Value
fv = Future value
i = Interest rate per compounding period
n = Number of compounding periods
PV
=
fv
(
1
+
i
)
n
PV
=
fv
(
1
+
i
)
n
PV
=
fv
(
a
)
n
PV
=
fv
b
PV
=
PV = { fv } over { (1+i)^{n}
Works best on Firefox
Present Value of Annuity
Regular Withdrawal
Interest Rate
Number of Compounding Periods
Present Value
Equation
PV = Present Value
d = Deposit per compounding period
i = Interest rate per compounding period
n = Number of compounding periods
PV
=
d
1
−
1
(
1
+
i
)
n
i
PV
=
d
1
−
1
(
1
+
i
)
n
i
PV
=
d
1
−
1
(
a
)
n
i
PV
=
d
1
−
1
(
b
)
i
PV
=
d
1
−
c
i
PV
=
d
1
⨯
e
i
PV
=
f
i
PV
=
PV = d {1 - {1} over {(1 + i)^{n}}} over { i }
Works best on Firefox