Despite the abundance of free graphing software, Texas Instruments' de facto monopoly and the continued demand for its use in standardized testing have kept the cost and design of graphing calculators largely unchanged for decades.

Try out an emulated version of the TI-84 Plus CE, the graphing calculator released by Texas Instruments in 2015.

As of 2025, the College Board has banned the use of calculators with computer algebra systems on the SAT and PSAT.

View a library of custom programs that can be loaded onto graphing calculators, including productivity tools, reference materials, games, and interactive applications, such as prom proposals.

Slide rules—ruler-sized mechanical calculators with a component that slides out to show relationships between numbers—were used by engineers at NASA during the Apollo missions.

Designed in 1937 by Harvard graduate student Howard H. Aiken, the 'Harvard Calculator' was used by the US Navy to solve advanced physics problems.

One of the first mechanical calculators—the Pascaline—was built in the 1640s by French mathematician Blaise Pascal to help his father, who worked as a tax collector.

Unsatisfied with the designs provided by an Apple engineer, Steve Jobs designed the original Mac calculator in about 10 minutes.

VisiCalc was the first electronic spreadsheet, released with Apple II's personal computer in 1979

Before 1979, managers were essentially information processors working off paper ledgers. Scenario modeling was slow, manual, and expensive. Companies were understood as organizations that built things with financial analysis as secondary. VisiCalc made calculation so cheap that you could work iteratively, setting out forecasts and tweaking assumptions until you got the answer you wanted. Oks argues It created a new way of seeing the world.

The cost of college has more than tripled over the past five decades

Determining the all-in cost for each student’s specific circumstances can be tricky. But what is behind the rise in price? Analysts point to a number of factors—lack of transparency around cost, expansive government support, increased administrative burdens at schools, and more.

Track how college tuition has changed over the years across different types of institutions

The dramatic rise in the cost of higher education has a number of causes, ranging from increased number of students to administrative expansion at institutions. Even when accounting for inflation, the cost to pursue a degree has tripled over the past six decades. See data from the National Center for Education Statistics breaking out costs by institution type and year.

The first commercially successful calculating machine—the arithmometer—was patented in 1820 but not mass-produced for over three decades, likely because its inventor was focused on his insurance business.

Explore galleries of featured submissions from the Desmos Art Contest—a yearly competition where students from around the world submit original work made with graphing calculator tools.

Explore the history of the iPhone from 2007 to 2023.

From 1991 to 2024, lithium-ion battery cell prices have fallen by 99%

The decrease from about $10,000 to $50 per kilowatt-hour has been driven by innovations in battery chemistry, improvements in manufacturing and supply chains, and increases in global cumulative production, which have caused average price declines of 19% each time it has doubled.

See how the cost of college tuition has changed overtime

Since the middle of the 20th century, higher education has been viewed as a stepping stone to well-paying professional careers for millions of Americans. But, it can be costly. As of 2024, annual tuition currently ranges from around $10K for an in-state, four-year public university to almost $40K for private institutions.

College tuition has climbed 600% in 40 years

The cost of attending college has outpaced inflation in the US. Tuition has climbed more than 600% in the past 40 years; more than three times the inflation rate. Many students have racked up student loans to cover rising college costs, while others have chosen not to attend college altogether.

Americans spend an average of $200 on tax preparation services like TurboTax and H&R Block

In 2025, about half of Americans were able to file taxes directly with the IRS for free. It was the second year of the agency's new program, which cuts out intermediaries. Though tax preparation has been free for many Americans, critics say tax companies upsell customers.

Is Domino’s pizza inflation-proof?

A Big Mac Extra Value Meal is nearly $11 in 2025, compared to $4.59 in 1993. A Taco Bell crunchy taco costs $1.79 today, but was only 59 cents in 1990. Inflation impacts the price of many fast-food items—but the price of a Domino's pizza hasn't changed much at all in the past two decades.

Slick interfaces and bundling helped solidify Excel as the corporate planning tool

First initiated in the 1980s, the Excel spreadsheet built off predecessors like Lotus and VisiCalc, leveraging a novel graphic interface to entice new customers and packaging the program with other Microsoft Office products. Forty years later, the tool faces challenges from Google and AI, but retains devoted users.

How much money you'd have now if you bought bitcoin years ago

Do you ever wonder how much money you'd have now if you bought bitcoin in 2019? 2018? 2017? This calculator provides the answer. Plug in the amount of bitcoin you would have purchased, plus the year and the currency.

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.

Calculators convert input values into a form of scientific notation—a fixed set of digits with a decimal multiplied by a base to some exponent—to store and process very large or very small quantities efficiently at the cost of rounding errors.

The pregnancy test industry is worth roughly $769M

The inventor of the at-home pregnancy test, Margaret Crane, largely hasn't taken credit for her invention until recently.

The average cost of college has doubled in the 21st century

Even for students attending in-state, public universities, the cost of attending college has risen dramatically, exceeding $27K with fees and living expenses per year.

NASA purchased about 60% of all integrated circuits from 1961 to 1965

The US government adopted the new technology to support the development of the Apollo Guidance Computer, which would help astronauts fly to the moon. This drove manufacturing up and costs down, setting the stage for the modern computing era.

Calculate the value of a paper savings bond

An IRS tax refund is the only way to buy a paper savings bond, but if you have an old paper savings bond you can determine its current value with this calculator. The calculator only works for paper savings bonds of Series EE, Series I, Series E, and savings notes.

Check the current Consumer Price Index

The Consumer Price Index is a metric that attempts to capture price changes felt by consumers by averaging a basket of about 80,000 items, each weighted to reflect the impact of changes on households.

The first smartwatch was made by Microsoft in 1994

Coproduced by Timex, the Timex DataLink 150 featured a small LCD screen and could transfer data to and from a Windows PC. Like the Windows XP Tablet that launched in 2002, the smartwatch did not sell well, and both products are considered to have been released before their time.

Introduced in 1981 for $1,795, the Osborne 1 was the world's first commercially successful portable laptop, despite weighing 24.5 pounds and having no battery.

Microsoft Excel is used by over a billion people worldwide

The upstart computer software company Microsoft launched its columns-and-rows spreadsheet program in 1985, enabling users to sort information, create charts, and perform calculations with minimal friction. It would be coupled with Microsoft Word and PowerPoint in 1990 as part of the Microsoft Office for Windows.

Moore's Law came from observing exponential computing growth in the 1960s

In 1965, Gordon Moore, cofounder of Intel Corporation, observed a four-year trend of constant growth rate in computing power. Hypothesizing the trend would continue, his observation became the benchmark that the computing industry has worked to maintain for 60 years.

Among the smallest mass-produced mechanical calculators in history, the Curta was designed by Austrian engineer Curt Herzstark while imprisoned in a Nazi concentration camp during World War II.

How much do you pay in gas taxes?

The average national price jumped from $3.02 to $4.12 per gallon between March and April in 2026, but state prices range widely, from $3.66 in Texas to $5.79 in California, driven by differences in taxes, proximity to supply, and local competition.

You can find the value of a dollar dating back to 1635

The value of a dollar hasn’t been consistent throughout history. An inflation calculator lets you compare the value of dollars from any two years over the past four centuries.

The US lags behind other developed countries in math and science scores

The Programme for International Student Assessment, administered every three years by the OECD to 15-year-olds, scores US students below the OECD average in math (465 vs. 472) and only slightly above average in science (499 vs. 485). These figures place US pupils in the lower half of developed nations.

It cost the IRS $0.36 to collect $100 in 2024

It costs the IRS a significant amount of money to do part of its job—collecting money. For instance, the Internal Revenue Service spent $16.1B to collect $4.7T in taxes in 2023.

College sticker prices can be misleading, as most students don't actually pay the advertised price due to financial aid.

Check the real-time price of bitcoin

Bitcoin has gone through several boom and bust cycles. Those peaks and valleys sit on top of a steadily rising value, growing as the currency gains wider adoption. As of 2024, bitcoin’s total market value was over $1.3T, with more than 19.6 million coins in circulation. Still, the value fluctuates.

The iPhone's impact in 10 charts

It's been almost 20 years since Steve Jobs first unveiled the iPhone, the device that would come to define Apple for years and change not just the smartphone industry but the world at large. 10 examples of the iPhone's impact include its all-screen touch interface and the way it led to the rise of app culture.

Customers wrote just one check a year in 2024, on average

Major retailers like Target have stopped accepting checks in recent years as real-time payment systems are increasingly being implemented across the US. This shift is considered an improvement in safety—as checks are vulnerable to fraud—but can lead to some exclusion for those without access to digital devices.

The history of graphics processing units began with hardware for displaying visuals in arcade machines, but the transition to 3D graphics led to the microchips and software that power today's AI data centers.

CES debuted in 1967 amid a wave of miniaturization in at-home electronics

The rapid development of integrated circuits—the basis of computing power—in the 1960s catalyzed an industrial shift toward miniature devices, including pocket transistor radios, smaller TVs, and more. This first consumer electronics trade show (with a slate of 117 exhibitors and 17,000 attendees) sought to make everyday electronics accessible and portable. See a timeline of early consumer tech with photos.

Ray Bradbury wrote 'Fahrenheit 451,' his landmark dystopian novel, on a rented typewriter in the basement of a UCLA library.

Explore a college affordability and transparency guide

From the US Department of Education, this portal provides everything you need to evaluate colleges. The college scorecard provides handy data on every school, from graduation rates to annual average earnings out of school, while the net cost calculator directs you to each school's calculator that allows you to estimate the cost of college based on your unique circumstances.

ATMs drastically expanded access to checking accounts in the 1960s

The invention disrupted the local bank industry, allowing customers to access cash around the clock and when out of town. The innovation also reduced the headcount needed for bank services and created a new revenue stream via ATM fees for noncustomers. This 50-year anniversary retrospective revisits the cash kiosk.

College sticker prices can be misleading, as most students don't actually pay the advertised price due to financial aid.

Charting the most popular email providers since 1997

The email is the most stable feature of the Internet; a rare digital product that changed little over the decades. Nonetheless, the major email service providers have vastly shifted. Watch this time-based chart which shows the number of users of the top 10 email providers since 1997, and see how totally nonexistent Gmail skyrockets to dominance by today.

A technological breakthrough altered how Billboard determined what was popular.

Abaci, the plural of abacus, allowed individuals to perform arithmetic and tally quantities by moving pebbles called calculi, from which the word 'calculator' is derived.

Since 2025, AI data center growth has created shortages and price hikes in graphics processing units and their supporting hardware, including high-speed memory.