All Tools
208 free calculators, converters & financial tools
Percentage Calculator
Calculate percentages
Scientific Calculator
Scientific calculations
Fraction Calculator
Add, subtract, multiply & divide fractions
Quadratic Equation Solver
Solve ax² + bx + c = 0
Probability Calculator
Probability & combinations
Pythagorean Theorem Calculator
Calculate sides of a right triangle
Average Calculator
Mean, weighted average
Graphing Calculator
Plot functions and equations visually
Statistics Calculator
Mean, median, mode & standard deviation
Standard Deviation Calculator
Calculate standard deviation & variance
Z-Score Calculator
Calculate z-scores & probabilities
Confidence Interval Calculator
Calculate confidence intervals
Sample Size Calculator
Determine required sample size
Correlation Calculator
Calculate correlation coefficient
Percentile Calculator
Calculate percentile rank
A/B Test Calculator
Statistical significance for A/B tests
Variance Calculator
Population & sample variance
Length Converter
Convert length units
Weight Converter
Convert weight units
Temperature Converter
Convert temperatures
Currency Converter
Convert currencies
Loan EMI Calculator
Calculate loan EMI
Compound Interest Calculator
Calculate compound interest
Simple Interest Calculator
Calculate simple interest
SIP Calculator (India)
Systematic Investment Plan returns
Mortgage Calculator
Calculate mortgage payments
Retirement Calculator
Plan your retirement savings
ROI Calculator
Calculate return on investment
Discount Calculator
Calculate sale price & savings
Tip Calculator
Calculate tips
Break-Even Calculator
Find your break-even point
GST Calculator
Calculate GST/VAT amounts
Margin Calculator
Calculate profit margins
Salary Calculator
Calculate take-home pay & deductions
Inflation Calculator
Calculate purchasing power over time
Amortization Calculator
View loan amortization schedule
Credit Card Payoff Calculator
Plan credit card debt payoff
Debt Snowball Calculator
Optimize debt repayment strategy
Auto Loan Calculator
Calculate car loan payments
Savings Goal Calculator
Plan monthly savings for a goal
NPV Calculator
Calculate net present value
IRR Calculator
Calculate internal rate of return
CAGR Calculator
Calculate compound annual growth rate
Depreciation Calculator
Calculate asset depreciation
Sales Tax Calculator
Calculate sales tax amounts
Rule of 72 Calculator
Doubling time estimator
401k Calculator
Project 401k retirement balance
Roth IRA Calculator
Roth IRA growth projections
Startup Runway Calculator
Calculate months of runway left
Burn Rate Calculator
Calculate monthly burn rate
LTV Calculator
Calculate customer lifetime value
CAC Calculator
Calculate customer acquisition cost
Churn Rate Calculator
Calculate customer churn rate
MRR Calculator
Calculate monthly recurring revenue
BMI Calculator
Calculate your BMI
BMR Calculator
Calculate basal metabolic rate
Calorie Calculator
Daily calorie needs
Body Fat Calculator
Estimate body fat percentage
Ideal Weight Calculator
Find your ideal weight
Pregnancy Due Date Calculator
Calculate due date
Water Intake Calculator
Daily water intake
Macro Calculator
Calculate macronutrients
TDEE Calculator
Calculate total daily energy expenditure
Heart Rate Zone Calculator
Find your training heart rate zones
Sleep Calculator
Calculate optimal sleep & wake times
BAC Calculator
Estimate blood alcohol content
Calories Burned Calculator
Estimate calories burned by activity
One Rep Max Calculator
Calculate your one rep max
Pace Calculator
Calculate running or walking pace
Ovulation Calculator
Track fertile window
Protein Calculator
Daily protein needs
Blood Sugar Converter
mg/dL to mmol/L
Waist-to-Hip Ratio
Body shape assessment
Calorie Deficit Calculator
Weight loss calorie planning
Body Surface Area Calculator
Calculate BSA (Du Bois)
Lean Body Mass Calculator
Calculate lean body mass
Blood Pressure Checker
Check BP category
A1C Calculator
A1C to avg blood glucose
Cholesterol Ratio Calculator
Cholesterol ratios & risk
Age Calculator
Calculate your exact age
Date Difference Calculator
Days between dates
JSON Formatter
Format & validate JSON data
Word Counter
Count words, characters & sentences
Color Converter
HEX, RGB & HSL converter
Ohm's Law Calculator
Calculate voltage, current & resistance
Password Generator
Generate secure passwords
GPA Calculator
Calculate your GPA
Margin Of Error
Margin Of Error calculator and tool
Contribution Margin
Contribution Margin calculator and tool
Conversion Rate Calculator
Conversion Rate Calculator calculator and tool
L T V C A C Ratio
L T V C A C Ratio calculator and tool
Payback Period
Payback Period calculator and tool
Body Frame Size
Body Frame Size calculator and tool
Caffeine Half Life
Caffeine Half Life calculator and tool
Period Calculator
Period Calculator calculator and tool
Sleep Debt Calculator
Sleep Debt Calculator calculator and tool
Steps To Calories
Steps To Calories calculator and tool
Steps To Distance
Steps To Distance calculator and tool
Target Heart Rate
Target Heart Rate calculator and tool
Conception Calculator
Estimate the conception date from a due date or last period
Fat Intake Calculator
Daily fat grams by type from calorie needs and diet goals
Fiber Calculator
Daily fiber target based on age, sex, and calorie intake
Pregnancy Weight Gain
Healthy pregnancy weight gain range by week and starting BMI
Cap Rate Calculator
Real estate capitalization rate
Cash-on-Cash Return
Real estate cash return %
Rental Yield Calculator
Calculate rental return on investment
Debt Service Coverage Ratio
Calculate DSCR for property loans
Gross Rent Multiplier
Evaluate investment property value
GCS Calculator
Calculate Glasgow Coma Scale score
SOFA Score
Sequential Organ Failure Assessment
qSOFA Score
Quick SOFA for sepsis screening
Wells Score (DVT)
Deep vein thrombosis probability
Wells Score (PE)
Pulmonary embolism probability
CHA₂DS₂-VASc Score
Stroke risk in atrial fibrillation
HAS-BLED Score
Bleeding risk in anticoagulation
HEART Score
Major cardiac events risk assessment
Framingham Risk Score
10-year cardiovascular disease risk
ASCVD Risk Calculator
Atherosclerotic cardiovascular risk
Corrected QT Interval
QTc by Bazett, Fridericia & more
TIMI Risk Score
ACS mortality risk stratification
GFR Calculator
Glomerular filtration rate (CKD-EPI)
Creatinine Clearance
Cockcroft-Gault equation
FENa Calculator
Fractional excretion of sodium
Corrected Calcium
Albumin-corrected calcium level
MELD Score
Model for End-Stage Liver Disease
MELD-Na Score
MELD with sodium correction
Child-Pugh Score
Liver cirrhosis severity
Ranson's Criteria
Pancreatitis severity predictor
APACHE II Score
ICU severity classification
CURB-65 Score
Pneumonia severity assessment
Anion Gap Calculator
Serum anion gap calculation
A-a Gradient Calculator
Alveolar-arterial oxygen gradient
BSA Calculator
Body Surface Area (Mosteller, DuBois)
Ideal Body Weight
IBW by Devine formula
Adjusted Body Weight
ABW for obese patients
IV Drip Rate Calculator
Calculate IV infusion rate (gtts/min)
Opioid MME Converter
Morphine milligram equivalents
Parkland Formula (Burns)
Fluid resuscitation for burns
Rule of Nines (Burns)
Total body surface area burned
NIH Stroke Scale
Stroke severity assessment
ABCD2 Score (TIA)
Stroke risk after TIA
Gestational Age Calculator
Calculate gestational age from LMP
Bishop Score
Cervical readiness for labor
Apgar Score Calculator
Newborn health assessment
Fetal Weight Estimator
Estimate fetal weight by ultrasound
Pregnancy Weight Gain (Clinical)
IOM-recommended weight gain ranges
PHQ-9 Depression Score
Patient depression severity screening
GAD-7 Anxiety Score
Generalized anxiety severity screening
CAGE Questionnaire
Alcohol use disorder screening
Braden Scale
Pressure ulcer risk assessment
Morse Fall Scale
Patient fall risk assessment
Harris-Benedict (Clinical)
Clinical basal energy expenditure
Mifflin-St Jeor (Clinical)
Clinical resting metabolic rate
Blood Alcohol Content
Estimate BAC from drinks consumed
Carboplatin Dose (AUC)
Calvert formula for carboplatin dosing
ECOG Performance Status
Cancer patient functional status
Injury Severity Score
Trauma severity classification
Nutrition Screening (NRS-2002)
Nutritional risk screening for hospitalized patients
Fluid Balance Calculator
Track intake vs output fluid balance
Pain Scale Converter
Convert between pain assessment scales
BMI Calculator (Clinical)
Clinical BMI with risk categories
Beam Calculator
Calculate load, deflection, shear & moment
Gear Ratio Calculator
Calculate gear ratios & output speed/torque
Voltage Divider Calculator
Output voltage from resistor divider
Integral Calculator
Definite & indefinite integrals
Derivative Calculator
First & higher-order derivatives
US Federal Tax Calculator
Calculate US federal income tax
India Income Tax Calculator
Indian income tax calculation
VAT Calculator
Add or remove VAT from price
BTU Calculator
Heating & cooling BTU requirements
DNA Molecular Weight
Calculate DNA strand molecular weight
RNA Molecular Weight
Calculate RNA strand molecular weight
PCR Primer Tm Calculator
Melting temperature for PCR primers
Beer-Lambert Law Calculator
Absorbance, concentration & path length
Cell Doubling Time
Calculate cell culture doubling time
Hemocytometer Cell Count
Count cells using hemocytometer
Serial Dilution Calculator
Calculate serial dilution concentrations
Colony Forming Units
CFU/mL from plate counts
Bioavailability Calculator
Drug bioavailability & AUC
Pharmacokinetics Half-Life
Drug elimination half-life & clearance
Protein Molecular Weight
Protein MW from amino acid sequence
Restriction Enzyme Digest
Predict restriction fragment sizes
ANOVA Calculator
One-way & two-way analysis of variance
Independent T-Test
Compare means of two groups
One-Way ANOVA
Compare means across multiple groups
Correlation Matrix
Pearson correlation between variables
Likert Scale Analyzer
Analyze Likert-type survey responses
Survey Sample Size Calculator
Sample size for surveys
Demographic Rate Calculator
Birth, death & migration rates
Dependency Ratio Calculator
Economic dependency ratio
Standard Score (Z-Score)
Convert raw score to Z-score
Percentile Rank Calculator
Percentile rank from scores
Effect Size (r)
Correlation-based effect size
Fisher's Exact Test
Exact test for small 2×2 tables
Kruskal-Wallis Test
Non-parametric one-way ANOVA
Amazon FBA Fee Calculator
Calculate Amazon FBA fees & profit
YouTube Earnings Calculator
Estimate YouTube ad revenue
OEE Calculator
Calculate Overall Equipment Effectiveness from availability, performance, and quality
Weight & Balance Calculator
Aircraft weight and center-of-gravity calculation
Salary/Paycheck Calculator
Calculate take-home pay after taxes and deductions
Life Insurance Needs
Estimate how much life insurance coverage you need
Military Pay Calculator
US military base pay by rank and years of service (2026 DFAS pay table)
Dimensional Weight Calculator
DIM weight for shipping carriers
Seed Rate Calculator
Calculate seeding rate per acre or hectare
Donation Impact Calculator
See the impact of your charitable donations
BOD/COD Calculator
Biochemical and chemical oxygen demand in water
Lift/Drag Calculator
Calculate lift-to-drag ratio for aircraft
Time Study Calculator
Standard time from observed cycle times