Educational

  • Ten-Pin Bowling Score Calculator
    Calculate your ten-pin bowling score frame by frame. Handles strike and spare bonuses automatically across all 10 frames, max score 300.
  • GPA Score Calculator
    Calculate your GPA on a 4.0 scale. Enter each course's grade points and credit hours to get a credit-weighted grade point average instantly.
  • Net Promoter Score (NPS) Calculator
    Calculate your Net Promoter Score (NPS) from promoter, passive and detractor counts. NPS = % Promoters − % Detractors on the 0–10 scale.
  • Multiply Mixed Numbers Calculator
    Multiply two mixed numbers (like 2 1/2 × 1 1/3) instantly. Get the simplified fraction, mixed-number form, and decimal answer with full steps.
  • Days Until My Exam Calculator
    Count the days until your exam with this free study countdown. Enter your exam date to see days, weeks left, and total planned study hours.
  • Decimal Multiplication Calculator
    Multiply two decimal numbers instantly. See the product plus how the decimal places add up (places in a + places in b = places in product).
  • Multiplication Calculator
    Multiply two numbers instantly with this free multiplication calculator. Enter any two values (a and b) and get the exact product, with decimals supported.
  • Speed, Distance & Time Calculator
    Free Speed, Distance & Time calculator. Solve for speed, distance, or time using d = s × t. Supports km, miles, meters, hours, minutes & seconds.
  • Percentage to Letter Grade Calculator
    Convert a percentage score into a letter grade (A, B, C, D, F) and GPA using the standard 10-point grading scale. Fast and free.
  • Percentage to GPA Conversion Calculator
    Convert a percentage score to a GPA on the 4.0 scale using a simple linear formula. Enter your percentage and instantly get your equivalent grade point.
  • Percentage to Letter Grade Calculator
    Convert a percentage score to a letter grade (A, B, C, D, F) and 4.0 GPA equivalent using the standard 10-point US grading scale.
  • Combination Calculator (nCr)
    Calculate combinations without repetition (nCr) instantly. Enter n and r to find how many ways you can choose r items from n where order does not matter.
  • Percent Error Calculator
    Calculate percent error from experimental and theoretical values. Enter measured and actual values to get relative error as a percentage instantly.
  • Volume of a Rectangular Prism Calculator
    Calculate the volume of a rectangular prism (box) instantly with V = l × w × h. Also computes total surface area. Free, fast, and accurate.
  • Area of a Trapezoid Calculator
    Calculate the area of a trapezoid instantly from its two parallel bases and height using A = ½(b₁ + b₂)·h. Free, fast, and accurate.
  • Circumference of a Circle Calculator
    Calculate the circumference of a circle from radius or diameter using C = 2πr = πd. Get circumference, diameter, and area instantly with worked examples.
  • Field Goal Percentage Calculator
    Calculate basketball field goal percentage (FG%) instantly. Enter field goals made and attempted to get shooting efficiency as a percentage.
  • Volume of a Cone Calculator
    Calculate the volume of a cone instantly from its radius and height using V = (1/3)πr²h. Free, accurate cone volume calculator with worked example.
  • Scientific Notation Multiplication Calculator
    Multiply two numbers in scientific notation: (a×10^m)×(b×10^n). Get the normalized product, coefficient, exponent and decimal value instantly.
  • Repeated Multiplication (Exponent) Calculator
    Calculate a raised to the power n (repeated multiplication). Enter a base and exponent to instantly compute aⁿ = a×a×…×a with this free power calculator.
  • Money Multiplication Calculator
    Multiply money fast: enter unit price and quantity to instantly get the total cost. Free price × quantity calculator for shopping, invoices, and budgeting.
  • Multiplying Negative Numbers Calculator
    Multiply negative numbers instantly. See the product and the sign rule: two negatives make a positive, one negative makes a negative. Free and accurate.
  • Multiply Three Numbers Calculator
    Multiply three numbers instantly. Enter a, b and c to get the product a × b × c, including decimals and negatives. Fast, free and accurate.
  • Multiplication With Remainder Check Calculator
    Multiply two numbers and instantly verify with the fact family: a×b, b×a, p÷a and p÷b. Great for checking work and learning fact families.

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