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3D Volume Calculator
Calculate volume and surface area for cubes, spheres, cylinders, cones, and pyramids
401(k) Calculator
Calculate 401(k) retirement savings with employer match and compound growth
7-Point Skinfold Body Fat Calculator
Calculate accurate body fat percentage using 7-site skinfold measurements with Jackson-Pollock equations for comprehensive body composition analysis.
Absolute Value Calculator
Calculate absolute values and distances between numbers with comprehensive theory
Abuse Detector
Detect application abuse through abnormal request patterns and scraping attempts. Analyze user behavior.
ADHD ASRS Assessment
Screen for adult ADHD using the Adult ADHD Self-Report Scale (ASRS). Validated assessment for attention deficit hyperactivity disorder.
Air Fryer Converter
Convert conventional oven recipes to air fryer settings with automatic temperature and time adjustments.
Albumin Creatinine Ratio Calculator
Calculate the Albumin-to-Creatinine Ratio (ACR) to assess kidney function and detect early signs of kidney damage. Essential for monitoring kidney health.
Aldrete Score Calculator
Evaluate post-anesthetic recovery readiness using the standardized Aldrete Scoring System for PACU discharge decisions.
Amortization Calculator
Generate detailed payment schedules with principal and interest breakdown
Angle
Convert between angle units including degrees, radians, gradians, arc minutes, and arc seconds. Perfect for mathematics, navigation, and trigonometry.
Aortic Valve Area Calculator
Calculate aortic valve area using the continuity equation to assess aortic stenosis severity. Free online calculator using echocardiographic measurements.
Apgar Score Calculator
Calculate Apgar scores to assess newborn health immediately after birth. Evaluate vital signs and determine need for intervention.
API Response Simulator
Simulate API responses with custom status codes, delays, and payloads for frontend testing.
Area
Convert between area units including square meters, acres, hectares, square feet, and square miles. Essential for real estate and land measurement.
Arterial Blood Gas (ABG) Calculator
Analyze arterial blood gas values for acid-base balance, oxygenation, and respiratory function. Free ABG interpretation calculator for medical professionals.
Arterial Blood Gas Analyzer
Comprehensive analysis and interpretation of arterial blood gas results. Assess acid-base balance and respiratory function.
ASI Addiction Severity Index
Use the Addiction Severity Index (ASI) for comprehensive assessment of addiction severity across multiple life domains and treatment planning.
ASSIST Screening Test
Use the WHO ASSIST (Alcohol, Smoking and Substance Involvement Screening Test) to assess substance use risks across multiple drug categories.
Astronomical Distance Calculator
Convert cosmic distances between astronomical units (AU), light-years, parsecs, and kilometers. Calculate travel times and understand scale comparisons for space missions and stellar measurements.
Astronomy Events Calendar
Track upcoming astronomical events including meteor showers, eclipses, conjunctions, and other celestial phenomena.
Astrophotography Calculator
Calculate optimal camera settings for astrophotography using the 500 Rule and NPF Rule. Get exposure times, ISO recommendations, and image stacking calculations for perfect star photos without trailing.
Audit Logger
Collect and analyze security audit logs. Track authentication events and security incidents for compliance.
AUDIT-C Alcohol Questionnaire
Brief screening tool to identify hazardous drinking and alcohol use disorders. Validated questionnaire for clinical assessment.
Auto Lease Calculator
Calculate monthly car lease payments and compare leasing vs buying with total cost analysis
Auto Loan Calculator
Calculate monthly car payments with taxes, fees, and trade-in value
Base64 Converter
Easily encode and decode text and files to Base64 format. Simple and fast online Base64 conversion tool.
Bionic Reading Converter
Convert text to bionic reading format for faster reading speeds and better comprehension. Free online bionic text formatter.
Blacklist Checker
Check if an IP address is listed on any spam or security blacklists with our free online blacklist checker tool. Verify your email server's reputation.
Blood Alcohol Content (BAC) Calculator
Calculate your estimated blood alcohol concentration based on weight, gender, and consumption. Understand BAC effects and legal implications.
Blood Pressure Calculator
Calculate and analyze your blood pressure readings. Understand systolic and diastolic values and their implications for your cardiovascular health.
Blood Type Predictor Calculator
Predict possible blood types for children based on parental blood types. Understand ABO and Rh factor inheritance patterns.
BMI Calculator
Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight. Simple, accurate BMI calculator with health recommendations.
Body Adiposity Index (BAI) Calculator
Calculate Body Adiposity Index (BAI) using hip circumference and height. Alternative to BMI for body fat assessment without requiring weight.
Body Fat Calculator
Calculate your body fat percentage using multiple methods including Navy formula, BMI method, and skinfold measurements. Track body composition accurately.
Body Mass Index (BMI) For Men
Calculate BMI specifically calibrated for men. Get accurate body mass index results with male-specific health recommendations.
Body Mass Index (BMI) For Women
Calculate BMI specifically calibrated for women. Get accurate body mass index results with female-specific health recommendations.
Body Proportions Calculator
Calculate ideal body proportions based on the golden ratio and your height. Get personalized measurement goals for a balanced physique.
Bonus Tax Calculator
Calculate taxes on bonuses and commissions using the 2025 IRS supplemental withholding method (22% federal rate). See exact take-home after federal, state, Social Security, and Medicare taxes for all 50 states
Breathalyzer Test
Calculate estimated Blood Alcohol Content (BAC) using the Widmark formula. Educational tool for understanding alcohol impairment levels and legal limits.
Bruce Protocol Treadmill Test Calculator
Calculate estimated VO2 max and cardiovascular fitness using Bruce Protocol treadmill test results. Free exercise stress test calculator for healthcare professionals.
Brute-Force Blocker
Detect and block brute-force login attacks with rate limiting and IP blocking. Protect against credential stuffing.
Budget Calculator
Create a balanced monthly budget using the 50/30/20 rule and track expenses
BUN to Creatinine Ratio Calculator
Calculate the BUN to creatinine ratio to assess kidney function and hydration status. Interpret your lab results with our free medical calculator.
Burns Fluid Estimator Calculator
Calculate fluid resuscitation requirements for burn patients using the Parkland Formula. Essential tool for burn care and emergency medicine.
Business Days Calculator
Calculate business days between dates excluding weekends and holidays. Add or subtract working days from a date with our free business days calculator.
Butter Converter
Convert butter measurements between sticks, cups, tablespoons, grams, and ounces.
CAD-ILD GERD Assessment
Assess GERD symptoms and risk factors in patients with Connective Tissue Disease-associated Interstitial Lung Disease.
CAGE Alcohol Screening
Screen for alcohol use disorders using the CAGE questionnaire. Quick assessment tool for alcohol dependency.
Calendar Tool
Browse calendar, view holidays and plan events with our interactive online calendar tool. Free, easy-to-use calendar with customizable holidays.
Capital Gains Tax Calculator
Calculate capital gains tax for 2025 with short-term vs long-term rates, NIIT, and state taxes
Centor Score Calculator
Assess streptococcal pharyngitis probability using Centor criteria to guide antibiotic treatment decisions.
Cerebral Blood Flow Calculator
Calculate cerebral perfusion pressure and estimate brain blood flow to assess neurological risk and guide treatment.
CHA₂DS₂-VASc Score Calculator
Calculate stroke risk in patients with atrial fibrillation using the CHA₂DS₂-VASc score. Determine appropriate anticoagulation therapy with our free calculator.
Character & Word Counter
Count characters, words, sentences, and paragraphs in your text. Free online text statistics tool.
Child-Turcotte-Pugh Calculator
Assess liver disease severity in children using the Child-Turcotte-Pugh classification. Calculate CTP score and prognosis.
Chmod Calculator
Calculate and convert between symbolic and numeric file permissions for Unix/Linux systems using the chmod command format with our free calculator.
CIDR to IP Range
Convert a CIDR notation to an IP address range, displaying the start and end IP addresses with our free CIDR to range converter.
Circle Calculator
Calculate circle properties: radius, diameter, circumference, and area from any one value
Clark's Rule Calculator
Calculate pediatric medication doses using Clark's Rule based on weight. Accurate weight-based dosing for children and adolescents.
Code to Image
Convert code snippets to beautiful, shareable images. Customize with various themes and programming languages.
Color Converter
Convert between color formats including HEX, RGB, RGBA, HSL, and HSV. Free online color code converter with preview.
Compound Interest Calculator
Calculate investment growth with compound interest and regular contributions
Conception Calculator
Calculate your conception date based on due date, current pregnancy stage, or LMP. Determine when you likely conceived your baby.
Constellation Finder
Discover the 88 IAU constellations with mythology, bright stars, best viewing times, and deep-sky objects. Interactive constellation database for learning the night sky and planning stargazing sessions.
Coordinate Geometry Calculator
Calculate distance, midpoint, slope, and line equations from coordinates
Correlation Calculator
Calculate Pearson and Spearman correlation coefficients for data analysis
Corticosteroid Conversion Calculator
Convert between different corticosteroid medications with equivalent anti-inflammatory potency. Essential for medication transitions and dose optimization.
Cowling's Rule Calculator
Calculate pediatric medication doses using Cowling's Rule based on age. Safe and accurate dosing calculations for children aged 1-12 years.
COWS Score - Clinical Opioid Withdrawal Scale
Assess opioid withdrawal severity using the validated Clinical Opioid Withdrawal Scale (COWS). Monitor withdrawal symptoms and guide treatment.
CRAFFT Screening Test
Use the CRAFFT screening tool to assess substance abuse risk in adolescents and young adults. Validated screening questionnaire for healthcare providers.
Creatinine Clearance Calculator
Calculate your creatinine clearance and estimate kidney function using the Cockcroft-Gault formula. Free online tool for kidney health assessment.
Credit Card Payoff Calculator
Calculate payoff time and total interest for credit card debt
Cron Generator
Generate and validate cron expressions for scheduling tasks on Unix/Linux systems, with human-readable descriptions and next execution times.
CSF Cell Count Calculator
Analyze cerebrospinal fluid cell counts to diagnose CNS infections, inflammation, and neurological conditions.
CSP Validator
Validate Content Security Policy headers to prevent XSS and clickjacking. Test CSP directives and identify misconfigurations.
CSS Formatter
Format and beautify CSS stylesheets with proper indentation and structure. Free online CSS prettifier.
CSS Minifier
Compress CSS stylesheets by removing unnecessary characters, white spaces, and comments. Free online CSS optimizer.
Daily Calorie & Macro Planner
Calculate your personalized daily calorie needs and optimal macronutrient distribution. Plan your nutrition goals with BMR, TDEE, and macro ratio calculations.
Data Size Converter
Convert between bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), and terabytes (TB). Free data size converter.
Data Transfer Rate
Convert between data transfer rates including Mbps, Gbps, MB/s, and more. Essential for network planning, bandwidth calculations, and download time estimation.
Day/Night Length Calculator
Calculate the length of daylight, night, and twilight periods for any location and date. Track seasonal changes in day/night duration.
Days Calculator
Calculate the number of days between two dates or add/subtract days from a date. Free online days calculator tool.
DDoS Detector
Detect and analyze DDoS attacks with real-time traffic monitoring. Identify volumetric attacks, SYN floods, and HTTP floods.
Debt Payoff Calculator
Compare debt avalanche and snowball methods to find the best debt elimination strategy
Degree to Radian Converter
Convert between degrees and radians with step-by-step conversions and trigonometric values
Derivative Calculator
Calculate derivatives using numerical differentiation methods with step-by-step solutions
Dietary Reference Intake (DRI) Calculator
Calculate Dietary Reference Intakes (DRI) and Recommended Daily Allowances (RDA) for vitamins, minerals, and nutrients based on age, gender, and life stage.
Dividend Calculator
Calculate dividend income growth with DRIP reinvestment, compound returns, and tax treatment
DNS Lookup
Check DNS records (A, MX, CNAME, etc.) with our free DNS lookup tool. Fast and reliable DNS record checker for domain diagnostics.
Drops Per Minute Calculator
Calculate IV flow rate in drops per minute (gtt/min) for gravity infusions. Essential tool for healthcare professionals and nursing students.
Drug Abuse Screening Test
Take the validated Drug Abuse Screening Test (DAST-10) to assess potential substance use disorders. Get personalized recommendations based on your risk level.
Due Date Calculator
Calculate your pregnancy due date using LMP, conception date, or ultrasound. Track pregnancy milestones and trimesters with our comprehensive calculator.
Duplicate Line Remover
Remove duplicate lines from text with this free online tool. Clean up lists and text data quickly.
E-Juice Calculator
Calculate precise e-juice mixing ratios for custom vaping liquids. Determine nicotine levels, VG/PG ratios, and flavor concentrations for DIY e-liquid blending.
Ejection Fraction Calculator
Calculate left ventricular ejection fraction using stroke volume and end-diastolic volume. Free online tool for cardiac function assessment.
Email Address Extractor
Extract email addresses from text or documents. Find and list all email addresses in your content.
Email Header Analyzer
Parse and analyze email headers to trace delivery paths, verify SPF/DKIM/DMARC authentication, and detect phishing attempts.
Email Signature Generator
Create professional email signatures with your contact information and styling. Free email signature generator.
Emoji Remover
Remove all emojis from text with this free online tool. Clean up text for processing or analysis.
Energy
Convert between energy units including Joules, calories, kilowatt-hours, and BTUs. Perfect for nutrition, electricity billing, and physics calculations.
Exfiltration Monitor
Monitor for data exfiltration attempts and unauthorized data transfers. Essential for data loss prevention (DLP).
EXIF Reader
Extract and view EXIF metadata from your photos including camera settings, location data, and more. Free online EXIF data reader.
Exponent Calculator
Calculate powers and exponents with step-by-step solutions for positive, negative, and fractional exponents
Factorial Calculator
Calculate factorials, permutations, and combinations for probability problems
Fagerstrom Test for Nicotine Dependence
Evaluate nicotine addiction severity with the validated Fagerstrom Test. Assess dependence levels, withdrawal risk, and get personalized cessation recommendations.
Fertility Window Calculator
Calculate your fertility window and most fertile days for conception. Advanced fertility tracking with multiple calculation methods.
FIB-4 Score Calculator
Non-invasive assessment of hepatic fibrosis using laboratory parameters and age. FIB-4 index for liver fibrosis evaluation.
Fick Cardiac Output Calculator
Calculate cardiac output using the Fick principle with oxygen consumption and arteriovenous oxygen difference. Free online tool for healthcare professionals.
Food Allergy & Sensitivity Tracker
Track food allergies, sensitivities, and intolerances. Log symptoms, identify trigger foods, and manage dietary restrictions for safer eating.
Food Barcode Scanner & Nutrition Info
Scan food barcodes to instantly get detailed nutrition information, ingredients, allergens, and health ratings using the OpenFoodFacts database.
Force
Convert between force units including newtons, pounds-force, kilogram-force, dynes, and more. Essential for physics, engineering, and structural analysis.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions
Fractional Excretion of Urea Calculator
Calculate fractional excretion of urea to differentiate prerenal from intrinsic acute kidney injury causes.
Framingham Risk Score Calculator
Calculate 10-year cardiovascular disease risk using the Framingham Risk Score. Free online tool for cardiovascular risk assessment and prevention.
Frequency
Convert between frequency units including hertz, kilohertz, megahertz, gigahertz, and RPM. Essential for electronics, radio, and sound engineering.
Fried's Rule Calculator
Calculate medication doses for infants under 2 years using Fried's Rule. Safe dosing calculations based on age in months.
GAD-7 Anxiety Assessment
Complete the GAD-7 generalized anxiety disorder assessment. Screen for anxiety disorders with this validated clinical tool.
GCD & LCM Calculator
Calculate GCD and LCM using Euclidean algorithm with step-by-step solutions
Gestational Diabetes Diet Calculator
Create a personalized meal plan for managing gestational diabetes during pregnancy. Calculate optimal calorie and carbohydrate needs based on your measurements.
Glasgow-Blatchford Bleeding Score
Risk stratification tool for upper gastrointestinal bleeding to predict need for intervention. Validated scoring system for emergency assessment.
Glasgow-Blatchford Bleeding Score (Alternative)
Alternative implementation of Glasgow-Blatchford Score for quick upper GI bleeding risk assessment and patient triage.
Google Fonts Pair Finder
Find perfect Google Font combinations for your website. View previews of font pairs and get ready-to-use CSS code.
Gross-Up Calculator
Calculate the gross payment needed to achieve a specific net amount after taxes. Perfect for tax-neutral bonuses, relocation packages, and net salary negotiations using 2025 tax rates
Hamilton Anxiety Rating Scale
Evaluate anxiety levels using the Hamilton Anxiety Rating Scale. Clinical assessment of anxiety symptoms and severity.
Hardy-Weinberg Equilibrium Calculator
Calculate allele and genotype frequencies using Hardy-Weinberg equilibrium principles. Free population genetics calculator for biology students and researchers.
HbA1c Calculator
Convert HbA1c values between units and determine average blood glucose levels for diabetes management and monitoring.
Healthy Recipe Finder & Nutrition Analyzer
Discover healthy recipes and analyze their nutritional content. Search recipes by dietary preferences, calorie goals, and nutritional requirements.
Heart Rate Based Calorie Burn Calculator
Calculate calories burned during exercise using heart rate data. Get precise energy expenditure estimates based on your actual workout intensity and duration.
Height Estimator Calculator
Estimate your child's potential adult height based on current measurements and growth patterns. Includes percentile rankings and growth analysis.
Home Affordability Calculator
Calculate how much house you can afford using the 28/36 rule and DTI ratios
Honeypot Endpoint
Create decoy endpoints to detect automated attacks and bots. Configure honeypot responses and alerts.
Hourly Paycheck Calculator
Calculate your hourly paycheck including regular hours, overtime (time-and-a-half), and all taxes for 2025. Perfect for hourly employees, part-time workers, and anyone with variable hours across all 50 states
HTML Encoder
Convert special characters to HTML entities and decode HTML entities back to characters. Free online HTML encoding tool.
HTML Formatter
Format and beautify HTML code with proper indentation and structure. Free online HTML prettifier.
HTML Minifier
Compress HTML code by removing unnecessary characters, white spaces, and comments. Free online HTML optimizer.
HTTP Headers
Analyze HTTP response headers, security headers, and server information with our free HTTP headers lookup tool.
HTTP Request Builder
Build and test HTTP requests with custom headers and body content. Supports all HTTP methods.
Hydration & Water Intake Tracker
Track daily water intake and monitor hydration levels. Calculate optimal fluid needs based on activity, climate, and individual factors for proper hydration.
Ideal Body Proportions Calculator
Calculate your ideal body measurements and proportions based on scientific ratios, golden ratio principles, and aesthetic standards for optimal physical development.
Ideal Proportions for Growth Calculator
Calculate ideal body proportions for muscle growth. Plan balanced development across muscle groups for aesthetic physique building.
Image Converter
Convert images between formats including JPG, PNG, WebP, and GIF. Free online image format converter with no registration needed.
Image Cropper
Crop images online with our free image cropper. Visual drag-and-select interface with aspect ratio presets and grid overlays. Perfect for social media posts.
Image Optimizer
Optimize and compress your images to reduce file size while maintaining quality. Free online image optimization tool.
Image Resizer
Resize images online with our free image resizer. Choose from social media presets or custom dimensions. Perfect for Instagram, Facebook, Twitter, and websites.
Ingredient Substitution Finder
Find suitable substitutes for cooking and baking ingredients with vegan and allergy-friendly options.
Ingredient Weight Converter
Convert between weight and volume for 23+ cooking ingredients with specific densities.
Insulin Dosage Calculator
Calculate your insulin dosage based on blood glucose levels, carbohydrate intake, and physical activity. Free online tool for diabetes management.
Integral Calculator
Calculate definite integrals using Simpson's Rule, Trapezoidal Rule, and Midpoint Rule
Investment Calculator
Calculate investment growth with regular contributions and compound interest