Determine the right amount of daily caffeine for you with this calculator.

Up to 400 milligrams of caffeine a day is considered safe

Small, frequent doses can be more effective than large amounts, though caffeine can raise blood pressure and heart rate, especially in people with hypertension. While low doses of caffeine may help with depression by stimulating dopamine, excessive caffeine, particularly from energy drinks, can lead to anxiety and heart issues.

The American Heart Association says adults can safely drink up to five cups of coffee per day and regular consumption may improve cardiovascular health.

See how much daily sugar substitute intake the FDA considers to be safe

The agency states in this PDF graphic that a person weighing about 132 pounds would have to consume roughly a couple dozen sweetener packets daily—or more—to reach unsafe levels of consumption. The accumulated consumption would be across all sources, including diet beverages, sugar-free candies, and actual packets added to coffee.

Coffee is addictive, and those going through withdrawal often experience headaches and fatigue.

Coffee contains an average of 15mg of caffeine per fluid ounce, which is significantly more than most sodas.

Calculate your estimated yearly dose of ionizing radiation

This calculator from the EPA provides a value in millirems—the US unit for effective dose—based on a variety of exposure parameters, including the state a user lives in and travel-related sources of ionizing radiation, such as passing through screening machines.

Explore this interactive tool from the National Cancer Institute to calculate your risk of dying from various causes, including cancer.

Use this federal student loan calculator to estimate your monthly student loan payments and see which repayment option is right for you.

Coffee gives you energy, but it ultimately makes you more tired.

Understand distinctions between coffee types and other popular cafe beverages with this visual guide.

Use a CD rate calculator

This CD Rate Calculator allows you to determine your interest earnings and total savings balance at CD maturity. Enter your initial deposit, your interest rate, and your term length in months or years. Click here to use it.

Determine your carbon footprint using the Environmental Protection Agency's Carbon Footprint Calculator, which incorporates various emission factors involving home energy, transportation, and water production.

Use this mortgage calculator to estimate how much you can borrow, factoring in fundamentals such as financial standing, property cost, loan length, and more.

Use this tool to calculate the dollar value of your parental mental load, from meal planning to coordinating after-school care, then see resources that help generate solutions.

Cultivate your coffee taste with this interactive flavor wheel.

Calculate the financial outlook for your retirement

This simple calculator takes your age, income, planned contributions, and expected retirement needs into account to give you a portrait of how your financial condition will look when it comes time to start withdrawals.

Your DNA may determine whether you like coffee or tea

Whether people prefer coffee or tea may boil down to a matter of taste genetics. People with a version of a gene that increases sensitivity to the bitter flavor of caffeine tend to be coffee drinkers, according to a report. Read on for more.

Calculate your chance of success for IVF treatments

The efficacy of in vitro fertilization procedures varies widely based on age, health history, genetics, and more. This CDC calculator provides an estimate of success rates based on your personal information, relying on thousands of reported outcomes across the US.

Watch Danish coffee expert Asser Christensen explain the best way to grind coffee.

Take a quiz to discover your brain care score

Each year, nearly 800,000 Americans have a stroke. With such a high occurrence rate, you may be asking yourself what you could do now to prevent a future stroke. Researchers at Harvard collaborated to answer this question by coming up with a "Brain Care" scoring system. Take the quiz to learn the quality of your brain health today and pick up helpful insights to lower your risk of stroke and dementia well into the future.

Use this interactive calculator to see if you could rebalance the federal budget by adjusting taxes and spending.

Bees are more likely to remember a flower if its nectar contains caffeine

Plants want pollinators to keep coming back, so the finding suggests that some plants, such as Citrus and Coffea species, have evolved to include caffeine in their nectar. Researchers suggest the findings could help develop methods to reinvigorate pollinator populations.

There is a best way to wake up—but not a best time

Sleep and circadian rhythm researchers say that waking up at a consistent time each day—even on weekends—and viewing morning sunlight are the best ways to keep body functions running at their peak. (Some users may encounter a paywall.)

Most things you would get tested for at the doctor’s office are influenced by circadian rhythm

In this video, a Salk Institute Researcher offers daily habit tips focused on aligning with your circadian rhythms. She notes heart rate and blood pressure are highest in the afternoon, for example, and there’s a triglyceride peak in the morning. Generally, she says, it’s a good idea to schedule your doctor’s checkups at the same time of day each year so there’s consistency across your data.

Calculate the salary of a mother's work

While traditional parenting roles are changing, mothers do a ton of work at home, from cleaning and cooking to managing household finances. This quick calculator estimates the salary a mother (or caregiver) should receive based on number of...

Chocolate can be deadly in humans, but only after consuming extraordinary quantities

Based on tests with mice, the lethal dose of chocolate is estimated to be no more than 1,000 mg/kg. This means that the lethal dose of dark chocolate for the average US adult is about 6.5 kilograms (14.33 pounds), or about 8,300 Hershey's kisses, in one sitting.

Calculate whether or not you're in the American middle class

In 2022, roughly 52% of US adults lived in middle-income households. This income calculator can help you determine whether or not you're one of them. Specifically, the calculator lets you enter your household income, location, and more to see where you line up in Pew's government data.

Figure out what type of mutual fund is right for you with a tool that lets you compare different mutual funds, from rates to returns.

The WHO labeled aspartame as 'possibly carcinogenic' but US regulators consider it safe

The International Agency for Research on Cancer, an arm of the World Health Organization, labeled aspartame—the artificial sweetener in Diet Coke—as one of several hundred possible cancer-causing substances in 2023. The determination was based on animal and human studies and "limited" evidence linking it to liver cancer. The WHO and US Food and Drug Administration both say the substance is safe at moderate levels. The FDA says a person weighing about 132 pounds would need to have 75 packets daily to reach an unsafe level.

A cup of coffee on Earth contains about 100 proton masses worth of dark matter

The estimate is based on Earth's location within the Milky Way and the dark matter cloud it resides in. Because scientists do not know the nature of dark matter, the mass may be accounted for with any number of dark matter particles of varying mass.

A life insurance cost calculator

The overall cost of life insurance coverage ranges widely. Factors like your term length, death benefit (the money paid out after death), health and lifestyle, and any added benefits can drastically change your monthly cost. This calculator can help you determine how much your desired coverage could run you per month.

Explore the complex relationship between calories and weight

What if you found out that weight loss is actually much more complex than "calories in, calories out" and that the 2,000 calorie-a-day recommendation may not actually be accurate?

Calculate your capital gains tax bill

If mental math is not your forte, a handy tool can help you figure out what you owe at tax time. Find the purchase and sales price of an asset, your taxable income, your tax filing status, and the length of time you held said asset, and you'll get your total for Uncle Sam.

Distinct plant species evolved to produce caffeine as a pesticide

Although it provides a defense against insects trying to eat caffeine-bearing plants, the molecule is an example of exaptation, where its original function was repurposed over time. Studies show that some plants now produce caffeine-laced nectar to help pollinators move more quickly and pollinate more efficiently.

A wedding cost calculator

Want to know how much your wedding will cost? Simply enter your wedding date, location, and a few more details about your wedding plans, and this tool will spit out an estimate for how much it will all cost—with details on how each estimate was figured, from a wedding dress or tux to ordering the cake. If you're planning a wedding soon (or just dreaming about planning one), explore this wedding cost generator.

This site sums up your entire life in statistics

If you’re able to read this statement, a lot has happened since you were born…and these statistics summarize what you have lived through! Input your birthday to find out about how many times your heart has beaten, how many breaths you’ve...

Calculate creator economy platform costs

The creator economy continues to be an attractive way to earn money for many people. While many platforms exist to help creators monetize their work, each has different feature sets and pricing models. This calculator helps workers decide which platform works best for them.

Before it was a drink, coffee was used for handwashing.

Listen to a '1440 Explores' podcast episode on the surprising story of how a humble Ethiopian berry reshaped religion, commerce, social life, slavery, and more.

Coffee was put on trial in Mecca in 1511, and its eventual acceptance helped coffee spread beyond religious use and into the world's first public coffeehouses, which ultimately gave birth to the London Stock Exchange.

What's your ACE score, and what does that mean for your health?

An ACE score is a way of measuring adverse childhood experiences, which can negatively impact health outcomes. Take this quiz to determine your score and what that means for your health. The Centers for Disease Control and Prevention and Kaiser...

The history of coffee

From its likely origins in what is now Ethiopia to today's worldwide consumption, this video uses a map to show how coffee conquered the world. Follow along and see how pilgrimages and centuries of trade influenced the spread of the beverage we all know so well.

A ‘rent vs. buy’ financial calculator

The New York Times built a continuously updated financial calculator to help potential homebuyers figure out which makes more sense given their individual situation: buying or renting a home. It takes into account how long someone plans to own the home for, mortgage rates, and more.

Use this annuity income calculator to estimate how much money someone can expect in their annuity payouts, depending on factors such as how much they invest and how long they expect to be paid.

Use this college navigator tool to make informed decisions about college options

Balancing the benefits and costs of higher education on a school-by-school basis can be overwhelming. This database from the National Center for Education Statistics provides an easily searchable database with comprehensive information on costs, student aid, outcomes for alumni, retention rates, and much more.

Search this citation-heavy database of nutrition and supplement research

Explore a reference site that aggregates and summarizes peer-reviewed studies on hundreds of supplements and dietary interventions. It is ad-free and funded by subscriptions, making it a health resource without a financial stake in what you buy.

Health officials recommend at least 150 minutes of aerobic exercise per week and 2 sessions of resistance training, targeting each major muscle group.

Are you burned out? Take this quiz

Have you ever wondered if what you’re experiencing is burnout, or just stress? This Psychology Today quiz may help you decide if you need to explore more mental health resources. You don’t have to create an account to take the quiz. Simply answer the questions and provide your ZIP code.

Memento Movi

Have you ever wanted life to be a little more like a movie? This somewhat absurd website shows you how far along you are in life, if your life was an actual film. Enter your birthday, how long you expect to live (using your best judgment!), and pick a film. The site will show you where you are in life—if your life was, say, "Inception" or "Wicked." A little silly, we know.

Use a prediction market profit or loss calculator

In order to calculate how much someone would make from a specific trade on a prediction market, this calculator asks for the purchase price of a given "yes" or "no" prediction, the number of contracts the trader plans to purchase, and more.

There is a template for how to live a better, healthier day, and it includes a digital sunset

Science suggests that early-morning exercise, later-morning peak work or social time, consistent exercise, and a "digital sunset"—starting to turn down the lights in the evening and avoid screens—are important for circadian health.