The FE Exam On-Screen Calculator
One of the most common concerns among FE exam candidates is the on-screen calculator. Unlike other engineering exams where you can bring your own scientific calculator, the FE exam provides a built-in calculator within the Pearson VUE testing software. Getting comfortable with this tool before exam day is critical for managing your time and avoiding calculation errors.
Calculator Features
The on-screen calculator provided during the FE exam is a scientific calculator with the following capabilities:
- Basic arithmetic operations (addition, subtraction, multiplication, division)
- Trigonometric functions (sin, cos, tan) and their inverses
- Logarithmic functions (log base 10 and natural log)
- Exponential function (e to the power of x)
- Square root and nth root
- Powers and exponents
- Memory storage and recall (M+, M-, MR, MC)
- Pi constant
- Parentheses for order of operations
How It Differs from Your Personal Calculator
If you are accustomed to a TI-84, TI-36X, or Casio scientific calculator, the on-screen calculator will feel different in several ways:
- No physical buttons: Clicking on-screen buttons is slower than pressing physical keys. This makes complex calculations take longer.
- No equation solving: The calculator cannot solve equations symbolically. You must isolate variables by hand and plug in values.
- No matrix operations: You cannot perform matrix multiplication or find determinants directly. Use the formulas from the FE Reference Handbook for these calculations.
- No graphing: There is no graphing capability. Sketch graphs on your erasable notepad if needed.
- No unit conversion: You must handle unit conversions manually using conversion factors from the FE Reference Handbook.
Strategies for Fast Calculations
Use Keyboard Shortcuts
Many on-screen calculators accept keyboard input. You can type numbers and operators directly from the keyboard instead of clicking on-screen buttons. This is significantly faster for entering long expressions. Practice using keyboard input during your study sessions with the NCEES practice exam software.
Break Complex Calculations into Steps
Instead of trying to enter an entire complex expression at once, break it into intermediate steps. Calculate the numerator, store it in memory (M+), calculate the denominator, then divide the memory value by the denominator. This reduces errors and makes it easier to catch mistakes.
Round Intermediate Values Carefully
Rounding too early can introduce significant errors, especially in multi-step calculations. Keep as many decimal places as possible in intermediate steps and only round your final answer. If you store intermediate values in calculator memory, they retain full precision.
Estimate Before Calculating
Before plugging numbers into the calculator, make a rough mental estimate of the expected answer. This helps you catch gross errors like entering the wrong exponent or forgetting a conversion factor. If your calculated answer is orders of magnitude different from your estimate, something went wrong.
Common Calculation Mistakes
- Angle mode errors: Make sure you are in the correct angle mode (degrees vs. radians) before using trigonometric functions. This is one of the most common sources of errors on the FE exam.
- Order of operations: The calculator follows standard order of operations, but complex expressions with multiple levels of nesting can lead to mistakes. Use parentheses liberally to enforce the correct evaluation order.
- Sign errors: Pay careful attention to positive and negative signs, especially when subtracting negative numbers or working with thermodynamic sign conventions.
- Unit mismatches: The calculator does not track units. You are responsible for ensuring all values are in consistent units before calculating.
Practice with the NCEES Software
NCEES provides a practice exam that uses the same software interface as the actual FE exam, including the on-screen calculator. Purchase and complete this practice exam before your test date. Even if you do not complete a full-length timed session, spend at least an hour getting comfortable with the calculator interface. This small investment of time can save you significant stress and lost time on exam day.
When to Skip the Calculator
Not every question requires detailed calculations. Some FE exam questions are conceptual and can be answered without using the calculator at all. Others can be solved by estimating or by inspecting the answer choices. Before reaching for the calculator, consider whether you can quickly identify the correct answer through logical reasoning or elimination.