Educational

  • GPA to Percentage Calculator
    Convert your GPA to a percentage on the 4.0 scale. Enter your GPA and scale to instantly get the equivalent percentage grade.
  • Insomnia Severity Index (ISI) Calculator
    Calculate your Insomnia Severity Index (ISI) score by summing 7 items (0–4 each, range 0–28) and get the standard severity interpretation.
  • Pittsburgh Sleep Quality Index (PSQI) Calculator
    Calculate your global Pittsburgh Sleep Quality Index (PSQI) by summing 7 component scores (0-3 each) for a 0-21 total. Scores above 5 suggest poor sleep.
  • FOIL Calculator
    Multiply two binomials using the FOIL method. Enter coefficients a, b, c, d to expand (ax+b)(cx+d) into a quadratic, with First, Outer, Inner, Last steps.
  • Double Digit Multiplication Calculator
    Multiply any two 2-digit numbers instantly. See the product plus the hundreds, tens, and units breakdown using the (10a+b)(10c+d) expansion.
  • Letter Grade to Percentage Calculator
    Convert points earned to a percentage and letter grade instantly. Enter your score and total to see your percentage, letter grade, and 4.0 GPA.
  • IELTS to TOEFL Score Conversion Calculator
    Convert an IELTS band score to an equivalent TOEFL iBT total using the official ETS concordance table. Enter your IELTS band to get the TOEFL range.
  • Grade Needed on Final for an A Calculator
    Find out the exact grade you need on your final exam to reach an A or any target grade, based on your current grade and the final's weight.
  • Percentage to CGPA (10-Point) Calculator
    Convert your percentage to CGPA on a 10-point scale using the standard CBSE formula (CGPA = percentage / 9.5). Fast, free and accurate.
  • Social Media Engagement Rate Calculator
    Calculate your social media engagement rate from likes, comments, shares and followers. Free engagement rate formula tool for Instagram, TikTok, X and more.
  • School Starting Age Calculator
    Find out how old a child will be on the school cutoff date and whether they meet the minimum starting age. Enter birth date, cutoff date, and required age.
  • SAT to ACT Score Conversion Calculator
    Convert your SAT total score (400–1600) into an equivalent ACT composite score (1–36) using the official 2018 SAT/ACT concordance tables.
  • Points-Based Grade Calculator
    Calculate your class grade percentage and letter grade from total points earned divided by total points possible. Fast, accurate points-based grading.
  • Points-Based Grade Calculator
    Calculate your course grade with the total points system. Enter points earned and points possible to get your percentage and letter grade instantly.
  • PERC Rule Calculator
    PERC Rule Calculator checks all 8 criteria (age, heart rate, SpO2, hemoptysis, estrogen, VTE, surgery, leg swelling) to rule out pulmonary embolism.
  • Wells Score for DVT Calculator
    Calculate the Wells Score for deep vein thrombosis (DVT) by summing 10 weighted clinical criteria to stratify low, moderate, or high pretest probability.
  • TIMI Risk Score for UA/NSTEMI Calculator
    Calculate the TIMI Risk Score for unstable angina and NSTEMI by summing 7 clinical risk factors to estimate 14-day adverse event risk.
  • Wells Score for Pulmonary Embolism Calculator
    Calculate the Wells Score for pulmonary embolism (PE). Add weighted clinical criteria to estimate PE probability with three-tier and two-tier risk.
  • wOBA Calculator
    Calculate Weighted On-Base Average (wOBA) from a hitter's walks, hits, home runs and plate appearances using standard linear-weight coefficients.
  • Test Score Fraction Calculator
    Convert correct answers out of total questions into a grade percentage and letter grade. Free test score fraction calculator using (correct/total) × 100.
  • WHIP Calculator
    Calculate a pitcher's WHIP (Walks plus Hits per Inning Pitched) instantly. Enter walks, hits, and innings pitched to get this key baseball stat.
  • Player Efficiency Rating (PER) Calculator
    Estimate a basketball player's efficiency rating from points, rebounds, assists, steals, blocks, misses and turnovers. Free per-36-minute PER calculator.
  • Effective Field Goal Percentage Calculator
    Calculate effective field goal percentage (eFG%) from FGM, 3PM and FGA. Free basketball shooting efficiency calculator with the standard eFG% formula.
  • Yards Per Attempt Calculator
    Calculate a quarterback's yards per attempt (Y/A) from passing yards and pass attempts. Free, instant football QB efficiency stat calculator.

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