Educational

  • Heron's Formula Calculator
    Find the area of any triangle from its three side lengths using Heron's formula. Free calculator showing area, semi-perimeter and perimeter instantly.
  • Multiply Powers with the Same Base Calculator
    Free calculator to multiply powers with the same base using a^m × a^n = a^(m+n). Add the exponents and get the simplified result instantly.
  • Doubling Calculator
    Double any number instantly. Enter a value and the doubling calculator multiplies it by 2 to show the result, supporting decimals and large numbers.
  • Area Model Multiplication Calculator
    Multiply two numbers with the area model (box method). See the partial products ac, ad, bc, bd in a grid and how they sum to the final answer.
  • SAT Percentile Calculator
    Estimate your SAT total score percentile (US). Enter a 400–1600 score to see what percent of test-takers you scored higher than, based on national data.
  • VO2 Max Estimate Calculator (Cooper Test)
    Estimate your VO2 max from the Cooper 12-minute run test. Enter meters covered in 12 minutes to get your aerobic fitness score in mL/kg/min.
  • Scrabble Word Score Calculator
    Calculate the Scrabble score of any word using standard English letter values, double/triple word multipliers, letter bonuses, and the +50 bingo bonus.
  • Cricket Batting Average Calculator
    Calculate a cricket batting average instantly. Enter total runs scored and number of times out to get runs per dismissal, the standard batting metric.
  • NIHSS Stroke Scale Calculator
    Calculate the NIH Stroke Scale (NIHSS) by summing 11 neurological items for a total stroke severity score from 0 to 42 with category.
  • 3-Point Percentage Calculator
    Calculate basketball 3-point shooting percentage (3P%) from 3-pointers made and 3-point attempts. Instant, accurate, and free.
  • GPA After Retaking a Class Calculator
    Estimate your new GPA after retaking a course with grade replacement. Enter your current GPA, credits, old grade and new grade to see the change.
  • Z-Score (Standard Score) Calculator
    Calculate the z-score (standard score) from a raw value, mean, and standard deviation. Free online z = (x − μ) / σ calculator with worked examples.
  • GPA to CGPA Calculator
    Convert a 4.0-scale GPA to a 10-point CGPA instantly. Enter your GPA to get the equivalent CGPA and approximate percentage.
  • CGPA to Percentage Calculator (10-Point Scale)
    Convert your 10-point CGPA to percentage instantly using the standard CBSE formula Percentage = CGPA × 9.5. Free, accurate, and easy to use.
  • Soccer League Standings Calculator
    Build a soccer/football league standings table. Enter each team's W-D-L and goals to rank by points, then goal difference and goals scored.
  • Points-Based Grade Percentage Calculator
    Convert points earned out of points possible into a grade percentage and letter grade instantly with this free points-based grade calculator.
  • Weighted Course Grade Calculator
    Calculate your overall course grade as a weighted average of assignments, quizzes and exams. Enter number or letter grades with weights — works even if weights do not total 100.
  • Square Number Calculator
    Square any number instantly with this free n² calculator. Enter a value and get its square (n × n), works for decimals and negatives too.
  • Is It a Multiple Calculator
    Check if one number is a multiple of another. Enter N and D to instantly see if N is divisible by D, with quotient and remainder shown.
  • 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).
  • Percentile Rank Calculator
    Calculate the percentile rank of a score within a data set using the standard percentile rank formula. Free, instant, and easy to use.

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