Educational

  • 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.
  • ACFT Two-Mile Run (2MR) Score Calculator
    US Army ACFT Two-Mile Run calculator. Enter your 2MR time to get an estimated 0–100 point score and see if you pass the 60-point minimum.
  • ACFT Pass/Fail Calculator (US Army)
    US Army ACFT pass/fail checker. Enter your 6 event point scores to see if you pass: every event needs 60+ points and a 360+ total.
  • pH Calculator
    Calculate pH from hydrogen ion concentration [H⁺], or find [H⁺] from pH. Get pOH, [OH⁻], and whether a solution is acidic, neutral, or basic.
  • Moles Calculator
    Calculate the number of moles from mass and molar mass using n = m / M. Free, instant chemistry mole calculator for students and labs.
  • Molar Mass Calculator
    Free molar mass calculator. Enter any chemical formula (H2O, C6H12O6, Ca(OH)2) to get the molar mass in g/mol from standard atomic weights.
  • Sin Cos Tan Calculator
    Calculate sine, cosine and tangent of any angle in degrees or radians. Instant sin θ, cos θ, tan θ values plus the angle converted to radians.
  • Percent of a Number Calculator
    Find what X% of Y is in seconds. Enter a percentage and a number to instantly calculate the percent of a number using result = (percent/100) × number.
  • Common Multiples Calculator
    Find the common multiples of two numbers. Computes the LCM, GCD and lists the first shared multiples of a and b instantly.
  • Multiply a Number by a Percentage Calculator
    Quickly multiply any number by a percentage. Enter a value and a percent to find the result instantly using result = n × (p ÷ 100).
  • Halving Calculator
    Free halving calculator: instantly find half of any number by dividing it by 2. Works with whole numbers, decimals, and large values.
  • Army Promotion Points Calculator (US)
    US Army promotion points calculator for Sergeant (E-5) and Staff Sergeant (E-6). Add weapons, ACFT, awards, education and training points, capped at 800.
  • Blood Alcohol Content (BAC) Calculator
    Estimate your blood alcohol content (BAC%) using the Widmark formula from drinks, body weight, gender, and time. Educational estimate — never drive after drinking.
  • Letter Grade from Percentage Calculator
    Convert a percentage score into a letter grade (A, B, C, D, F) instantly using the standard 90/80/70/60 grading scale, plus approximate GPA points.
  • GPA from Letter Grades Calculator
    Calculate your unweighted GPA from letter grades without credit hours. Enter A, B+, C- etc. and get your average on a 4.0 or 4.3 scale instantly.
  • Percentage to Letter Grade Calculator
    Convert a percentage score into a letter grade (A, B, C, D, F) instantly using the standard 10-point US grading scale, plus 4.0 GPA equivalent.
  • GPA Improvement Calculator
    Project your new cumulative GPA after next term. Enter current GPA, credits earned, expected term GPA and term credits to see your improvement.
  • Percentage to CGPA Calculator
    Convert your percentage into CGPA on a 10-point scale instantly using the standard CBSE formula CGPA = Percentage ÷ 9.5. Fast, free and accurate.

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