No Graphing Calculator in Physics? What to Use

You don’t need a graphing calculator for most introductory physics courses, but you do need a scientific calculator that handles trigonometric, logarithmic, and exponential functions. This article explains what the calculator on this page computes, what you should enter, and what results you get, then covers why graphing calculators are often unnecessary and how to choose the right tool.

Formula

The calculator above computes average speed using the standard kinematic formula:

v = d / t

• v = average speed (meters per second, m/s)
• d = distance traveled (meters, m)
• t = time taken (seconds, s)

To convert to kilometers per hour, multiply by 3.6 (since 1 m/s = 3.6 km/h).

Worked Example

Using the default values from the calculator block: distance = 100 m, time = 10 s.

1. Divide distance by time: 100 / 10 = 10 m/s.
2. For km/h: 10 × 3.6 = 36 km/h.

The calculator shows 10.00 m/s and 36.00 km/h.

Why Graphing Calculators Are Often Not Needed

Most physics problems in high school and early college are solved algebraically, not graphically. You rarely need to plot a function to find an answer. Instead, you plug numbers into formulas, solve for unknowns, and use trigonometry for vectors. A graphing calculator’s main advantage—plotting graphs—is rarely tested on exams, and many instructors forbid them because they store notes and programs.

What you actually need is a scientific calculator with buttons for sin, cos, tan, log, ln, and exponentiation. These cover the vast majority of physics calculations. For example, resolving a force into components requires sine and cosine; radioactive decay uses natural logs; projectile motion uses quadratic equations. A graphing calculator does all of that, but so does a $15 scientific model.

When a Graphing Calculator Might Help

There are a few situations where graphing capability is genuinely useful:

• Visualizing motion graphs (position vs. time, velocity vs. time) to check your work.
• Solving equations numerically when an algebraic solution is messy (e.g., finding roots of a cubic).
• Curve fitting experimental data in lab reports.

But even then, free software like Desmos or a phone app can do the same without the cost. If your course explicitly requires a graphing calculator, check the syllabus first—many allow a standard scientific model.

How to Choose the Right Calculator

If you’re buying a calculator for physics, consider these factors:

• Exam rules: Check if your school allows graphing calculators. Many exams (like the AP Physics) allow only scientific calculators.
• Functions needed: Make sure it has sin, cos, tan, inverse trig, log, ln, and exponent (^).
• Display: A two-line display helps you see the expression and result simultaneously.
• Battery life: Solar-powered models are reliable for long exams.
• Cost: Scientific calculators are typically $10–$20; graphing models are $80–$150.

If you already own a graphing calculator, it will work fine—just be aware that it may be overkill and might be restricted in exams.

Common Mistakes and Misconceptions

One frequent error is mixing up units. Always convert to SI units (meters, seconds, kilograms) before calculating. For example, if distance is given in kilometers, multiply by 1000 to get meters. Another mistake is using degrees instead of radians in trigonometric functions. Most physics formulas assume radians, but many calculators default to degrees. Check the mode setting.

A common misconception is that a graphing calculator is required for all STEM majors. In reality, most undergraduate physics courses only require a scientific calculator. Some advanced courses may use computer algebra systems like Mathematica or Python, but that’s separate from a handheld calculator.

Alternatives to a Physical Calculator

If you don’t want to carry a calculator, there are reliable alternatives:

• Smartphone apps: Many free scientific calculator apps work offline and have all necessary functions.
• Online calculators: Websites like this one provide instant calculations for specific formulas.
• Computer software: For lab work, use spreadsheet programs or Python for complex calculations.

However, check your exam policy—most tests do not allow phones or internet-connected devices. A physical calculator is still the safest bet for exams.

Frequently Asked Questions

Can I use a graphing calculator on the AP Physics exam?

No. The College Board allows only scientific calculators on AP Physics exams. Graphing calculators are not permitted because they can store notes and programs. Check the current AP calculator policy on the official College Board website for the most up-to-date rules.

Is a graphing calculator worth the money for physics?

Only if you also take math courses that require graphing (like precalculus or calculus). For physics alone, a scientific calculator is sufficient and much cheaper. If you already have a graphing calculator, use it; if not, save your money.

What is the difference between a scientific and a graphing calculator?

A scientific calculator handles arithmetic, trigonometry, logarithms, and exponents. A graphing calculator does all that plus plots graphs, solves equations symbolically, and can run programs. For physics, the extra features are rarely necessary.

Do I need a calculator for physics at all?

Yes, for most courses. Physics involves numerical calculations, and doing them by hand is error-prone and time-consuming. A scientific calculator is the minimum requirement. Some introductory courses allow simple arithmetic, but as you progress, you’ll need trigonometric and logarithmic functions.

Can I use a phone app instead of a calculator for physics homework?

For homework, yes, most apps are accurate and convenient. But for exams, phones are usually prohibited. It’s wise to practice with a physical calculator so you’re comfortable using it under test conditions.

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in t | Time | s | 10 | 0
in d | Distance | m | 100 | 0
out v | Average speed | m/s | d / t | 2
out v_kmh | Speed in km/h | km/h | (d / t) * 3.6 | 2