## Interactive Math Applets/Calculators for *The Calculus of Happiness*

Not only are you surrounded by math, thanks to technology it’s something you can interact with directly. That’s why I’ve created the interactive math applets linked to below. These are connected to math content discussed in *The Calculus of Happiness. *Check out the Interactive Math page for more applets.

#### Diet and Nutrition

How many calories does your body burn each day? (see Equations 1.1-1.2 in *The Calculus of Happiness*)

How many calories does your body burn per minute of exercise? (see Equation 1.4 in *The Calculus of Happiness*)

What’s your maximum heart rate? (see Equation 1.6 in *The Calculus of Happiness*)

How to estimate your Total Daily Energy Expenditure (see Equation 1.8 in *The Calculus of Happiness*)

Calculating the (surprisingly positive) effects of swapping carbs for fats in your diet (see Equation 2.1 in *The Calculus of Happiness*)

#### Personal Finances and Investing

Estimating your federal income tax due (see Equation 3.4 in *The Calculus of Happiness*)

Calculating the monthly payment on a loan (including a mortgage) (see Equation 3.10 in *The Calculus of Happiness*)

If you converted your rent payment into a mortgage payment, how much house could you afford? (see Equation 3.11 in *The Calculus of Happiness*)

Calculating how long it’ll take you to pay off a loan (see Equation 3.14 in *The Calculus of Happiness*)

How to retire early with the help of math (see Equation 3.17 in *The Calculus of Happiness*)

#### Love and Dating

Estimating the number of potentially compatible partners in your area (see Equation 5.1 in *The Calculus of Happiness*)

An equation for dividing up something (like pizza) fairly between two people (see Equations 6.7a-6.7b in *The Calculus of Happiness*); see also the TIME magazine version.