Howcast - Learn about debt-to-income ratio in this Howcast finance tutorial with expert Gregory McGraime.

Howcast - You've just seen the car of your dreams, but you're not sure if the price is right. In a few steps, you can calculate your potential car payments and decide if you'll be able to afford a new ride.

Howcast - Whether you need to lose 5 pounds or 100, use points to eat sensibly and stay on track toward a slimmer you.

Howcast - Your body fat percentage helps you determine your diet and exercise needs. The number gives you an idea of how much of your body is composed of fat, muscles, and tissue.

Howcast - A body fat calculator estimates the amount of fat you are carrying based on measurements at various parts of your body.

Howcast - Learn how to use a newspaper as a weapon in this self-defense video from Howcast.

Howcast - Learn how to calculate your body mass index (BMI) -- your body fat measurement based on height and weight -- in this Howcast video.

Howcast - Learn about body mass index (BMI) -- your body fat measurement based on height and weight -- in this Howcast video.

Howcast - Learn the difference between being overweight and being obese in this Howcast video.

Howcast - Learn what obesity is in this Howcast video.

Howcast - The density of salt water depends on how much salt is dissolved in it. Calculate the density of a particular sample with the method described here.

Howcast - The Federal-State Unemployment Insurance Program provides unemployment benefits to eligible workers who are unemployed through no fault of their own. Specific eligibility requirements and benefits may vary from state to state.

Howcast - Each month, the United States Government conducts a sample survey to measure the extent of unemployment in the country. To calculate the national unemployment rate, the survey places people in three categories: employed,...

Howcast - Net present value is the difference between an initial cost outlay and the present value of expected cash flow.

Howcast -The price on the tag is probably not the price you will end up paying. Follow these steps to determine how much your new purchase will really cost.

Howcast -You can find the volume of various 3-D objects using a few simple mathematical formulas.

Howcast -The real gross domestic product of a country measures the value of its economic activity. But how can you calculate it?

Howcast -Return on investment, or ROI, is the overall profit made on an investment expressed as a percentage of the amount invested -- one of the most important gauges of business success. Learn how to figure out your ROI.

Howcast -If you have scrap gold -- gold with no artistic or antique value -- you can calculate its market value before taking it to a dealer.

Howcast - Losing weight is easier when you know the number of calories you need versus the number you're actually consuming. These guidelines will help.

Howcast -Whether you are calculating the square footage of a piece of land, your house, or a room, the steps are similar.

A carbon footprint is an equation that estimates just how much you, personally, are contributing to global warming—and all you have to do is plug some info into an online calculator. Figuring out how to make your footprint smaller, of...

If you fear you're off to summer school, ease the stress of uncertainty with some simple math and know when to seek help with your grades.

Standard deviation quantifies how diverse the values of your data set are, and is useful in determining how different your numbers are from each other.