These online calculators can save you cash
These online calculators can save you cash

Oh, dread. The electricity bill has arrived again. Not only are the numbers gargantuan, but you have no clue how the total climbed that high.

Saving money comes down to cost per unit in almost every case — cents per ounce at the grocery store, miles per gallon at the gas station, kilowatts per hour on the electric bill and cents per minute on the cell phone bill.

But if you look at the minutiae of your major expenses, you can begin to see how things add up.

The good news? There are online calculators that do most of the work for you, and we’ve analyzed a few to see if they’re accurate. Links to all are at right.

— Fuel economy: www.fueleconomy.gov

Talk about personalized. This U.S. Department of Energy site has a “Your MPG” feature, which tracks your fuel economy and compares it with EPA test ratings and the miles per gallon of others with the same vehicle (sharing your information is optional). It also allows you to maintain a fuel purchase record, which tracks how much you are spending on gasoline. You have to do the calculations yourself, but this site walks you through.

— Fuel cost calculator: www.fuelcostcalculator.com

This site, run by AAA, has a simple calculator that estimates the cost of a trip before you hit the road, using current regional gasoline averages.

For example: A trip from Dallas to Houston is about 478 miles round trip. If 15.94 gallons of gas are used in a 1999 Nissan Sentra, the estimated cost will be $32.82, not including stops for fast food.

— Hybrid car cost calculator: www.eere.energy.gov/cleancities/hev/calculator

Thinking about buying a hybrid vehicle? This Department of Energy site will allow you to compare the lifetime costs and air emissions of a hybrid to those of a conventional vehicle. It even has data on makes and models, so you won’t have to enter any information.

— Mortgage refinancing calculator: www.bankrate.com

This site run by a financial research group offers many personal-finance calculators, from determining mortgage payments to deciding between buying or leasing a car. Thinking about refinancing? One calculator offers personalized information by checking mortgage lenders in your ZIP code. On the home page, click on “Calculators” tab at the top. Then on “Should you refinance your mortgage?” under “Mortgage Calculators.”

For example: Your monthly payment is $1,200, your balance is $100,000 at 6.5 percent and you’ve got 15 years left on your loan. You want a loan term of 15 years at an interest rate of 5.5 percent. Your new payment would be $817.08.

This doesn’t include application fees, title searches and appraisal fees, so get that info before you calculate.

— Saving vs. borrowing calculator: www.finaid.org/calculators

Need more information about financial aid for your college-bound student? Check out this site, run by Monster.com, which offers a college cost projector, a loan calculator, an expected family contribution calculator, a student budget calculator and more. We’ll look at the saving vs. borrowing calculator, which analyzes the benefits of saving beforehand vs. taking out loans for school.

For example: If you save $200 a month for 10 years before school at a savings interest rate of 5.38 percent, your total savings will be $31,838.18. If you take out that much in a loan, with an interest rate of 8.5 percent and fees of 4 percent, you’ll end up with monthly payments of $411.20 for the 10 years after school. That’s more than double the payment per month of saving ahead of time.

— Retirement calculator: www.aarp.org

The retirement calculator at the American Association of Retired Persons site helps you determine how much you’ll need to retire on and how to get there from where you are. On the home page, click on “Money and Work,” then “Financial Planning and Retirement” on the left-hand menu. Scroll down to “Retirement Planning,” and click on “Retirement Planning Calculator.”

The first section analyzes your retirement needs. First, enter you and your spouse’s age, expected retirement age, life expectancy, salary and desired household income.

If you don’t know how much money you’ll need, click on “estimate” and another calculator pops up and asks you to enter monthly expenses.

— Second income calculator: http://moneycentral.msn.com

Thinking of staying home to raise the kids and cut back on child-care costs? This calculator considers the income of each spouse, plus taxes, work expenses and lifestyles expenses, to let you know if that extra income is worth it.

On the home page, click on the “Planning” tab, then click on the “Savings” tab. In the left-hand menu, click on “Savings Calculator.” Under “More Tools” you’ll find the Second Income Calculator.

— Price check calculator: www.smartmoney.com

Investing in stocks can be a crapshoot. Check out this calculator run by Smart Money magazine first, and it will help estimate a fair price to pay for a stock based on the company’s earnings, projected earnings and the stock’s volatility. Just enter the ticker symbol and the calculator will do the rest. Go to the Tools & Maps section in the left-hand menu, and then click on Price Check Calculator.

— Home energy analysis: www.energystar.gov

Gather a year of energy bills and go to this government-funded site dedicated to energy efficiency to determine your monthly and annual usage. The site also will compare your home’s efficiency to similar homes across the country and offers home improvements that save on energy costs.

You’ll enter basic information about your home, including square footage (conditioned floor area), number of inhabitants and year it was built. You then enter your energy usage and bill amounts for each month or for the last year.

— Cell phone plan comparison: www.letstalk.com

This retail site allows you to compare plans and phones from different providers.

Still need help? According to the site, most wireless phones offer a built-in timer that tracks your cumulative usage. Reset your timer for when your monthly billing cycle begins.

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