Psychology
Free psychology tools: stress level assessment, reaction time test, emotional intelligence quiz, sleep quality score, and burnout risk.
Self-assessment scores, cognitive models and study or habit planning. 37 calculators. The self-assessment pages are for reflection, not diagnosis, and none of them is a clinical instrument.
The interface-design ones are the most solid, because they come from measured laws rather than questionnaires. Fitts’s law predicts how long it takes to hit a target from its size and distance, and it explains why the corners and edges of a screen are the most valuable real estate on it: they are infinitely deep targets, since the pointer stops there no matter how hard you throw it. That is why the Mac menu bar sits flush against the top edge and why a Windows taskbar button is easier to hit than an identical button one pixel higher.
Hick’s law covers the other half: decision time rises with the logarithm of the number of options, not linearly. Doubling a menu from 8 items to 16 does not double the time to choose, it adds roughly a third. Useful the next time somebody argues for splitting a menu into submenus.
Memory retention uses Ebbinghaus’s forgetting curve, which is 1885 research that has replicated well. Roughly half of new material is gone within a day without review, and the curve is why spaced repetition intervals grow rather than staying fixed.
Fitts' Law Movement Time Calculator
Calculate movement time to a target using Fitts' law. Enter distance, target width, and motor constants a and b to find index of difficulty and movement time.
Hick's Law Reaction Time Calculator
Calculate choice reaction time using Hick's law. Enter baseline RT, processing rate, and number of choices to predict response speed.
IQ Score Percentile Calculator
Calculate the percentile for any IQ score using the normal distribution. Enter an IQ score to see what percentage of people score at or below that level.
Signal Detection Theory Calculator
Calculate d-prime (d'), criterion c, and likelihood ratio beta from hit and false-alarm rates. Separates a real sensitivity from a mere willingness to say yes.
Weber-Fechner Sensation Calculator
Calculate just-noticeable differences with Weber's law and perceived magnitude with the Fechner and Stevens power laws. Enter intensity and Weber fraction.
Yerkes-Dodson Arousal Performance Curve
Model the inverted-U arousal-performance relationship from Yerkes-Dodson theory. Adjust arousal and task difficulty to see the performance curve shift.
Social Media Time Cost Calculator
Calculate time spent on social media per year and what you could do instead. Converts scrolling hours into books read, workouts, and skills learned.
Emotional Regulation Difficulty Scale
Assess how difficult it is for you to manage and regulate your emotions with a short self-assessment based on emotional regulation research.
Growth Mindset vs Fixed Mindset Calculator
Assess where you fall on the growth vs fixed mindset spectrum with a short questionnaire based on Carol Dweck's research from Stanford University.
Imposter Syndrome Score Calculator
Score imposter syndrome intensity on a 10-item questionnaire, identify which of the five Young subtypes fits you, and get advice matched to it.
Self-Compassion Score Calculator
Assess your level of self-compassion across three dimensions: self-kindness, common humanity, and mindfulness. Based on Dr. Kristin Neff research.
Digital Detox Planner Calculator
Plan a digital detox that fits your lifestyle. Calculate screen-free hours, set goals, and track how much time you reclaim per week.
Cognitive Bias Awareness Score
Rate how often eight common cognitive biases apply to you and get a ranked profile, showing which ones to guard against and the counter-move for each.
Gratitude Practice Score
Score your daily gratitude practice and mindfulness habits. Get personalized recommendations to deepen your gratitude routine and improve wellbeing.
Screen Addiction Risk Score
Calculate your screen addiction risk score from daily usage patterns, compulsive behaviors, and impact on daily life. Understand your relationship with screens.
Sleep Quality Score Calculator
Rate your sleep quality across key factors and get a score with personalized tips for improvement. Based on sleep health research.
Work-Life Balance Score Calculator
Assess your work-life balance with a structured scoring tool. Identify problem areas and get practical improvement strategies.
Memory Retention Calculator
Estimate memory retention using the Ebbinghaus curve R = e^(-t/S). Enter memory strength and elapsed time to see current recall and when to review next.
Procrastination Cost Calculator
Calculate financial and time cost of procrastination from hourly rate and hours wasted per day. Returns daily, weekly, monthly, and annual productivity loss.
Attention Span Estimator
Estimate your optimal focus session length from age, task type, and daily habits. Returns work block duration, break intervals, and daily deep work capacity.
Self-Esteem Assessment
Assess self-esteem with 6 items from the Rosenberg Scale. Returns a score out of 18, a low-to-high category, and evidence-based tips for healthier self-regard.
Sleep Debt Calculator
Calculate accumulated sleep debt from your target sleep need (7-9 hours) and actual nightly sleep over the past week. Returns risk level and recovery time.
Sleep Debt Recovery Calculator
Calculate your accumulated sleep debt and how long it takes to recover. Plan a sleep recovery schedule based on your deficit.
Cognitive Load Calculator
Assess mental workload by rating active tasks, decisions, interruptions, and stress. Returns a score with guidance on reducing tasks or taking a break.
Emotional Intelligence Self-Assessment
Assess your emotional intelligence across five key EQ dimensions. Get personalized insights on self-awareness, self-regulation, empathy, and social skills.
Personality Type Quick Assessment
Discover your personality type across four MBTI-style dimensions: I/E, S/N, T/F, J/P. Returns a 4-letter type code with trait description.
Resilience Score Calculator
Assess psychological resilience with a self-report questionnaire across emotional regulation, social support, and coping style. Returns a low-to-high rating.
Social Battery Calculator
Estimate social battery level and recharge time from recent events and intensity. Returns an energy score and introvert vs extrovert recovery guidance.
Burnout Assessment Calculator
Assess burnout risk with 10 questions covering exhaustion, cynicism, effectiveness, and spillover into life outside work. Returns a scored 10-50 result.
Decision Matrix Calculator
Compare two or three options across three weighted criteria. Assign an importance weight to each factor, then see ranked totals and what would flip the result.
Life Satisfaction Score (SWLS)
Measure your life satisfaction using the Satisfaction With Life Scale (SWLS). This validated 5-question psychological assessment rates your overall wellbeing.
Work-Life Balance Calculator
Evaluate work-life balance from daily hours for work, sleep, exercise, family, and leisure. Returns a balance score and breakdown of your 168-hour week.
Gratitude Journal Streak Calculator
Track a gratitude journaling streak, days journaled, completion rate, and total entries. Enter your start date and any days missed to see the real picture.
Habit Streak Calculator
Enter the start date of your habit and see your current streak in days, weeks, and months, plus motivational milestones you've reached.
Meditation Practice Time Calculator
Turn sessions per week and minutes per session into weekly, monthly, and yearly meditation totals, and see how long each milestone up to 1,000 hours takes.
Reaction Time Test
Test your reaction time by clicking when the screen changes color. Measures response time in milliseconds and compares to the average human reaction of 250ms.
Stress Level Assessment
Answer 10 lifestyle questions to get a personalized stress score. See which habits contribute most and get targeted advice for reducing your stress level.