Educational

  • Cube Number Calculator (n³)
    Free cube number calculator. Enter any number to instantly find its cube (n³ = n × n × n). Works with whole numbers, decimals, and negatives.
  • Plus/Minus GPA Calculator
    Calculate your GPA on a plus/minus 4.0 scale. Enter letter grades (A, A-, B+, ...) and credits to get a credit-weighted grade point average.
  • PHQ-9 Depression Score Calculator
    Calculate your PHQ-9 depression screening score (0–27) from the 9 standard items and see the matching severity band, from minimal to severe.
  • Gleason Score & Grade Group Calculator
    Calculate the prostate cancer Gleason score from primary and secondary patterns and convert it to the ISUP/WHO Grade Group (1–5).
  • Weighted GPA Calculator (5.0 Scale)
    Calculate your weighted GPA on a 5.0 scale. Honors/AP courses earn extra points (A=5.0) while regular courses use the standard 4.0 scale.
  • GPA from Number of Each Letter Grade Calculator
    Compute your GPA on a 4.0 scale by entering how many A, B, C, D and F grades you earned. Fast, free grade distribution GPA calculator.
  • QBR Calculator (NCAA Passer Rating)
    Calculate NCAA college football QBR / passer rating from completions, attempts, yards, touchdowns and interceptions using the official formula.
  • GPA Scale Converter
    Convert a GPA between any two grading scales — 4.0, 5.0, 10.0, or 100 — instantly. Enter your GPA, current scale max, and target scale max.
  • Required Final Exam Percentage Calculator
    Find out the exact percentage you need on your final exam to reach your target course grade, based on your current grade and the final's weight.
  • Coin Word Problem Calculator
    Practice US coin word problems. Enter coin counts and your guessed total; the calculator checks your answer and shows the step-by-step worked solution.
  • Surface Area of a Sphere Calculator
    Calculate the surface area of a sphere instantly with A = 4πr². Enter the radius to get surface area, diameter, and volume. Free and easy to use.
  • Surface Area of a Cylinder Calculator
    Calculate the total surface area of a cylinder from its radius and height using A = 2πr² + 2πrh. Free, instant, with lateral and base areas shown.
  • Volume of a Cube Calculator
    Calculate the volume of a cube instantly with V = a³. Enter the side length to get volume, surface area, and space diagonal in any units.
  • Percentage of a Total Calculator
    Find out what percent X is of Y instantly. Enter a part and a total to calculate the percentage using % = (X / Y) × 100. Free and easy.
  • ACFT Points Needed to Pass Calculator
    Find how many ACFT points you still need to hit your target total and the average score required per remaining event. Quick US Army fitness planner.
  • 529 College Savings Calculator
    Estimate how much your 529 college savings plan will grow with monthly contributions and compound returns. Free future value calculator for US families.
  • APFT Sit-Up Score Calculator
    Calculate your US Army APFT sit-up score (0–100 points) from reps and age band. Find out if you pass the 2-minute sit-up event.
  • APFT Push-Up Score Calculator (US Army)
    Estimate your US Army APFT push-up score (0–100 points) from reps, age and gender. See points per rep, reps for a max score, and the pass threshold.
  • APFT 2-Mile Run Score Calculator
    Estimate your US Army APFT/IPFU 2-mile run score (0-100) by age group and gender. Enter your run time to get points instantly.
  • MMSE Calculator (Mini-Mental State Examination)
    Free Mini-Mental State Examination (MMSE) calculator. Add up the 7 domain scores to a total out of 30 and see normal, mild or severe impairment categories.
  • GRE Score Calculator
    Add your GRE Verbal (130–170) and Quant (130–170) scaled scores to get your total GRE score on the 260–340 scale, plus your position in the band.
  • Final Exam Impact Calculator
    Calculate your course grade after the final exam. Enter your current grade, expected final score, and final exam weight to see the impact instantly.
  • AP® Psychology Score Calculator
    Estimate your AP® Psychology score (1–5) from multiple-choice correct answers and FRQ points using composite-score cut points. US College Board exam.
  • AP® Statistics Score Calculator
    Estimate your AP® Statistics exam score (1–5) from multiple-choice and free-response points. US College Board exam — uses typical composite cut scores.

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