Educational

  • SAT Superscore Calculator
    Calculate your SAT superscore (US) by combining your best EBRW and Math section scores across multiple test attempts, out of 1600.
  • Passing Score / Pass Mark Calculator
    Find how many questions you must answer correctly to pass an exam. Enter the total questions and required pass percentage to get the minimum passing score.
  • Test Grade Calculator
    Free test grade calculator: enter correct answers and total questions to instantly get your score percentage and letter grade (A–F).
  • Easy Grader Calculator
    Free easy grader calculator: enter total questions and number wrong to instantly get the grade percentage and letter grade for any test or quiz.
  • GPA Needed Calculator
    Find the GPA you need in upcoming courses to reach your target cumulative GPA. Enter current GPA, credits earned, target GPA, and new credits.
  • Grade Calculator (Overall Course Grade from Weighted Categories)
    Calculate your overall course grade from weighted categories like homework, quizzes, and exams. Enter each score and weight to get your final percentage.
  • CGPA to GPA Calculator
    Convert your CGPA on the 10-point scale to a GPA on the US 4.0 scale instantly. Free, accurate CGPA to GPA calculator with the formula explained.
  • Chess Elo Rating Change Calculator
    Calculate your new chess Elo rating after a game. Enter your rating, opponent's rating, result, and K-factor to see the exact rating change.
  • Quiz Score Calculator
    Calculate your quiz or test score percentage and letter grade instantly. Enter correct answers and total questions to get your result and A–F grade.
  • NEWS2 Score Calculator
    Calculate the NEWS2 (National Early Warning Score 2) used by the UK NHS from 6 vital signs plus oxygen, with sub-scores and clinical risk band.
  • Wells Score Calculator for Pulmonary Embolism
    Calculate the Wells Score for pulmonary embolism (PE) from 7 clinical criteria. Get instant two-tier (likely/unlikely) and three-tier risk stratification.
  • CURB-65 Pneumonia Severity Score Calculator
    CURB-65 calculator scores community-acquired pneumonia severity (0–5) from Confusion, Urea, Respiratory rate, Blood pressure and Age ≥65, with mortality risk.
  • Factor Pairs Calculator
    Find every factor pair of a number — all (a, b) where a × b = N. Lists pairs, counts them, and shows the total number of divisors instantly.
  • Multiply Fractions by a Whole Number Calculator
    Multiply a fraction by a whole number instantly. Enter a/b and n to get the product, fully simplified, plus the decimal value. Free and easy.
  • Missing Factor Calculator
    Solve for the missing factor in N × ? = P. Enter the known factor and product to instantly find the unknown multiplier using division.
  • Squares & Cubes Table Generator
    Generate a squares and cubes table from 1 to N instantly. See n², n³ for every number plus the running totals. Free, fast math reference tool.
  • Multiply by Powers of 10 Calculator
    Multiply any number by a power of 10 (N × 10^k) and see how the decimal point shifts right or left. Fast, accurate place-value calculator.
  • Single Multiplication Table Generator
    Generate the multiplication table of any number N up to 20 rows. Instantly see N × 1 through N × 20 with products and the running sum.
  • Multiplication Grid Chart Generator
    Generate a full multiplication grid chart from 1 to N. Build a printable times table where each cell shows i × j, with totals and the largest product.
  • Skip Counting Calculator
    Skip counting calculator: count by 2s, 5s, 10s or any step from any start number. Generates the sequence, last term and sum instantly.
  • Volume of a Cylinder Calculator
    Calculate the volume of a cylinder instantly from its radius and height using V = πr²h. Also shows base area and total surface area.
  • Volume of a Sphere Calculator
    Calculate the volume of a sphere from its radius using V = (4/3)πr³. Instantly get volume, diameter, and surface area in any unit.
  • Distance = Rate × Time Calculator
    Solve d = r × t instantly. Find distance, rate (speed), or travel time from any two known values. Free, fast, and works with any consistent units.
  • Perimeter of a Rectangle Calculator
    Calculate the perimeter of a rectangle instantly using P = 2(l + w). Enter length and width to get perimeter, area, and diagonal.

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