A simple equation that will save you money (2024)

You know how much that new TV costs, but how many hours will you work to pay for it?

That’s the question you should ask before swiping your credit card, according to MoneyNing founder David Ning. The financial guru said he uses a simple equation to discourage splurging: Divide the cost of a potential purchase by your hourly wage to determine whether it’s worth the work.

Cost of item / hourly wage = hours you’ll work to pay for it

According to Ning’s observations, $39.99 is what a lot of people spend on everyday purchases.

“If you get numb [to buying things] and $40 seems like nothing, but you’re making $10 an hour, you really have to work four hours just to make that money,” Ning told NBC News BETTER.

What's the best thing money can buy according to Ning? Freedom.

Salaried workers will need to do a little more math to figure out this equation, he said. For example, a person making $60,000 a year, after paycheck deductions, is probably making around $20 an hour, he said.

“So even if you make $60,000, that $40 purchase is still going to cost you two full hours,’” he said. “When you think about it that way, a lot of people are like, ‘Whoa, maybe that $40 isn’t really worth it.’”

Recurring purchases add up

Ning said most people don’t consider the amount they spend on recurring purchases, or the number of hours they work to pay for them.

“Something like cable TV is $100 every month,” he said. “So again going back to the $60,000 salary person — [which is] $20 an hour — you’re working 5 hours just for that TV subscription,” he said.

Recurring expenses are expenses people typically “just don’t think about,” he added, especially if the expense is automatically charged to a credit card.

Consider the true value of what you buy

Ning said he was raised with an understanding that frugality is a way of life. The son of Chinese immigrants who got by on little, the blogger doesn’t place much value on consumer goods. He said most products don’t have much value when you consider the amount of time it takes to work for them.

“For me personally, I need to see long-term value,” said Ning. He prefers spending his money on experiences, like family trips and vacations.

RELATED: The Ridiculously Simple Way to Save Money: Envelopes

“Experience is better than getting more stuff because when we buy stuff pretty much all the time after we use it once or twice after the initial hoopla kind of wears off, we’re just stuck there, toss it aside and there’s another thing we have to keep track of. And we don’t ever use it anymore,” he said. “But with experiences at least, we can cherish the memories and we get the value again and again.”

It’s all too easy for consumers to get tricked by marketers into thinking they need to buy new things to be satisfied, he warned.

“The marketing kind of plays into our psychology,” he said. “They tell us that it’s better, and in some ways, it is better. The house is bigger, the car has got the new car smell, runs better, looks nicer, and all that is true. But then [people] don’t think about how much it’s costing them.”

A simple equation that will save you money (1)

The more you save, the less you have to work

The 37-year-old worked in finance and IT for seven years before launching his financial blog in 2007, which he now runs full time.

“Most people work because they need the money or they want more money, but if they have the money already then they don’t have to work as much,” Ning said.

What’s the best thing money can buy according to Ning? Freedom.

“There’s like time-freedom and there’s also the peace-of-mind-type freedom,” he explained.

When you spend less on stuff, and save your money, you know you have a rainy day fund that brings you peace of mind, Ning said.

“If you’re really unhappy at work and you want a change, it kind of takes some savings in order to have the courage to say ‘no’ to your boss, and all that is freedom,” he explained.

“For a lot of people, if they really think about it, using money to buy that kind of freedom is way more important than getting that shiny new car again and again,” Ning concluded.

How to Decide if a Purchase is Worth the Work

  • Divide the cost of a potential purchase by your hourly wage to determine the number of hours you’ll work to pay for it (Cost of item / hourly wage = hours you’ll work to pay for it). Ask yourself: Is it worth it?
  • Use this calculation to determine if you are working too much to pay for recurring purchases, like cable and cell phone bills.
  • Consider the value of what you’re buying.
  • Money can buy freedom. The more you save, the more independence you have.
A simple equation that will save you money (2)

Julie Compton

Julie Compton is a freelance journalist in Brooklyn, New York. Follow her@julieallmighty

A simple equation that will save you money (2024)

FAQs

A simple equation that will save you money? ›

According to the 50/30/20 rule, divide your monthly after-tax income into three categories: 50% for needs, 30% for wants, and 20% for savings or paying off debt. Knowing exactly how much to spend on each category will make it easier to stick to your budget, and help keep your spending in check.

What is the formula for save money? ›

The 50-30-20 rule recommends putting 50% of your money toward needs, 30% toward wants, and 20% toward savings. The savings category also includes money you will need to realize your future goals.

What is the equation for saving? ›

Saving is national income minus consumption, s = ni-c. (1) National income equals national product, ni = np. (2) National product is consumption plus investment, np = c+i.

What is the math for saving money? ›

Savings rate and math

The formula for savings rate is pretty simple: Savings Rate = (Income – Expenses) / Income = Savings / Income. Based on that formula, there are two ways to increase your savings rate: You increase your savings. You decrease your income.

How can math save you money? ›

Using math also can help develop savings and spending plans. For example, if you want to buy a PlayStation 4, which costs roughly $400, you can figure out how much allowance money to save per week or month. Doing the math helps you set realistic goals for saving.

What is the formula for price savings? ›

Cost savings is calculated by subtracting the new price of the item of interest from the original price. The difference is then divided by the original price, and the results are multiplied by 100 to obtain the cost savings percentage.

How much will I have if I save $100 a month for 30 years? ›

Investing $100 per month, with an average return rate of 10%, will yield $200,000 after 30 years. Due to compound interest, your investment will yield $535,000 after 40 years. These numbers can grow exponentially with an extra $100. If you make a monthly investment of $200, your 30-year yield will be close to $400,000.

What is the formula for calculating savings? ›

Savings rate is calculated by dividing your monthly savings amount by your monthly gross income, and then multiplying that decimal by 100 to get a percentage. You can also use your annual savings amount and your annual gross income for this calculation.

What is the golden rule of saving formula? ›

In market equilibrium, the marginal product of capital equals the real interest rate r. Under the golden-rule of saving, r = n; the real interest rate equals the rate of population growth. In figure 3, the capital-widening ray is parallel to the line tangent to the intensive production function.

What is the 4 rule for savings? ›

The 4% rule limits annual withdrawals from your retirement accounts to 4% of the total balance in your first year of retirement. That means if you retire with $1 million saved, you'd take out $40,000. According to the rule, this amount is safe enough that you won't risk running out of money during a 30-year retirement.

What is the trick to saving money? ›

Set savings goals

One of the best ways to save money is to set a goal. Start by thinking about what you might want to save for—both in the short term (one to three years) and the long term (four or more years). Then estimate how much money you'll need and how long it might take you to save it.

What is the mathematical equation of money? ›

In equation form, it is represented by MV = PY, where M is money supply, V is the velocity of money, P is price level or inflation, and Y is the real output or real GDP.

How does math help you with money? ›

Maths skills can help you to calculate how much you need to save each month, and to track your savings progress. They can also help you to make decisions about where to save your money, such as in a savings account or a high-yield investment account.

How do you solve money in math? ›

Solving Money Math Word Problems
  1. Identify what the word problem is asking. ...
  2. Take note of keywords in the question. ...
  3. Write the equation using the information given in the problem.
  4. Solve the equation to find the solution, using the correct operation.
  5. Check your work and make sense of the answer.

How can I make a lot of money with math? ›

Math majors can qualify for a wide range of high-paying jobs, especially if they also study engineering or computer science. Some of the most common math careers are actuary, statistician, research analyst, teacher, and mathematician.

What is the correct formula for savings? ›

How To Calculate Your Savings Rate. Savings rate is calculated by dividing your monthly savings amount by your monthly gross income, and then multiplying that decimal by 100 to get a percentage. You can also use your annual savings amount and your annual gross income for this calculation.

What is the 50 30 20 rule of money? ›

Key Points. The 50-30-20 rule is a simple guideline (not a hard-and-fast rule) for building a budget. The plan allocates 50% of your income to necessities, 30% toward entertainment and “fun,” and 20% toward savings and debt reduction.

What is the formula for savings plan? ›

The 50/20/30 savings formula( often termed as savings calculator) is a common rule of thumb and a straightforward way to budget every month. Here's the breakdown of the 50/20/30 formula. The 50/20/30 formula prioritizes your essential needs and treats saving like your other monthly payments.

What is the 50 25 25 rule in saving? ›

Originally, the 50/25/25 method designates 50% of your paycheck (weekly, biweekly, monthly, etc.) to your bills (rent, phone, car), 25% of your paycheck to your long-term savings account and the last 25% to leisurely spending (ordering out, shopping, etc.).

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