Directory
All Calculators
Every calculator on Plain Calculators, grouped by category. 570 free tools — no sign-up, all in your browser.
Auto
- Gas Mileage
- Fuel Cost
- Cost Per Mile
- Car Lease
- Mileage Reimbursement
- Tire Size
- Gear Ratio
- Horsepower
- Engine Displacement
- Compression Ratio
- Quarter Mile
- Car Depreciation
- Tire Pressure
- HP to Torque
- Motorcycle Loan
- Car Affordability
- Lease Buyout
- 0-60 Time
- EV Charging Cost
Aviation
- Knots to MPH
- Nautical Miles
- Crosswind
- Density Altitude
- Pressure Altitude
- True Airspeed
- Wind Correction
- Ground Speed
- Zulu Time
Body
Business
- ROI
- CPM
- ROAS
- Conversion Rate
- Revenue
- Gross Profit
- Lifetime Value
- Acquisition Cost
- Churn Rate
- EBITDA
- Net Profit Margin
- Contribution Margin
- Operating Margin
- Inventory Turnover
- Markdown
Construction
Convert
- cm → inches
- mm → inches
- feet → meters
- pounds → kg
- acres → sq ft
- inches → feet
- oz → lb
- gallons → liters
- m² → ft²
- mph → knots
- Roman Numerals
- cm → feet
- feet → inches
- inches → mm
- feet → cm
- yards → feet
- lb → oz
- lb → g
- g → oz
- mg → g
- stone → lb
- kg → stone
- sq ft → acres
- mph → km/h
- °F → °C
- °C → K
- inches → cm
- km → miles
- kg → lb
- cm → mm
- km → m
- m → yards
Date & Time
- Age
- Date Difference
- Time Duration
- Date ± Days
- Days Until
- Time Calculator
- Military Time
- Sleep
- Business Days
- Day of Week
- Days Until Christmas
- Chronological Age
- Days Since
- Half Birthday
- Zodiac Sign
- Days Until Halloween
- Days Until Thanksgiving
- Days Until New Year
- Days Until Summer
- Days Until Easter
- Age Difference
- minutes → hours
- hours → days
- days → hours
- weeks → months
- Roman Numeral Date
- Birthday Countdown
Debt
- Credit Card Payoff
- Debt Payoff
- Debt Snowball
- Debt Avalanche
- Loan Payoff
- Debt-to-Income
- Minimum Payment
- Credit Utilization
- Debt Consolidation
Energy
- Electricity Cost
- Watts to Amps
- Amps to Watts
- Watts to kWh
- Solar Panel
- Volts to Watts
- kWh Cost
- Voltage Divider
- LED Resistor
- Wire Gauge
- Battery Life
- Parallel Resistor
- Series Resistor
- Resistor Color Code
- Capacitor
- Watt-Hours
Finance
- Inflation
- APY
- Present Value
- Future Value
- Net Worth
- CAGR
- Dividend Yield
- Stock Average
- Rule of 72
- 50/30/20 Budget
- Emergency Fund
- Savings Rate
- Savings Longevity
Fitness
- TDEE
- Macros
- Protein Intake
- Body Fat
- One-Rep Max
- Calories Burned
- Heart Rate
- Water Intake
- Steps to Miles
- Calorie
- Lean Body Mass
- Keto
- Body Recomposition
- Waist-to-Height
- Intermittent Fasting
- FFMI
- DOTS
- Wilks
- FTP
- Calories Burned Walking
- Steps to Calories
Fun & Random
- Random Number
- Coin Flip
- Dice Roller
- Random Letter
- Love Calculator
- Numerology
- Angel Number
- Chinese Zodiac
- Dating Age Range
- Gematria
Geometry
- Area
- Volume
- Surface Area
- Circle
- Area of a Circle
- Triangle Area
- Cylinder Volume
- Sphere Volume
- Distance Formula
- Midpoint
Health
- A1C
- Body Surface Area
- QTc
- ANC
- LDL Cholesterol
- Maintenance Fluid
- FeNa
- Creatinine Clearance
- Corrected Calcium
- Anion Gap
- eGFR
- Mean Arterial Pressure
- Pack-Year
- Corrected Sodium
Home & Garden
- Square Footage
- Concrete
- Gravel
- Mulch
- Cubic Yard
- Topsoil
- BTU
- Pool Volume
- Stairs
- Flooring
- Deck
- Wallpaper
- Sod
- Tank Volume
- Gravel Driveway
- Firewood
- Generator Size
- Water Heater Size
- Pool Salt
- Plant Spacing
- Grass Seed
- Fertilizer
- Raised Bed Soil
- Ceiling Fan Size
Kitchen
- Recipe Scaler
- ml → cups
- cups → tbsp
- tsp → tbsp
- Air Fryer
- Pizza Dough
- Coffee Ratio
- Unit Price
- oz → cups
- tbsp → cups
- quarts → cups
- cups → quarts
- cups → mL
- oz → tbsp
- gallons → cups
- tsp → cups
- cups → grams
- mL → grams
- Rice Per Person
- Turkey Size
- Food Cost
- mL → oz
- liters → oz
- tbsp → tsp
- tsp → mL
- Sourdough Hydration
- Baker’s Percentage
- Cake Pan Conversion
- Brine
- Brisket Cooking Time
Loans
- Mortgage
- Loan
- Auto Loan
- Amortization
- Compound Interest
- Simple Interest
- Mortgage Payoff
- Refinance
- Personal Loan
- Student Loan
- HELOC
- Home Equity Loan
- Boat Loan
- RV Loan
- Car Payment
- FHA Loan
- VA Loan
- USDA Loan
- Mortgage Recast
- Extra Mortgage Payment
Math
- Average
- Standard Deviation
- Variance
- Median & IQR
- Coef. of Variation
- Correlation
- Linear Regression
- Confidence Interval
- P-Value
- Binomial
- Fraction
- Slope
- Scientific Notation
- Probability
- Percentage Difference
- Pythagorean Theorem
- Quadratic Formula
- GCF
- LCM
- Ratio
- Square Root
- Long Division
- Exponent
- Rounding
- Mean/Median/Mode
- Percentile
- Z-Score
- Combination
- Standard Error
- Decimal to Fraction
- Fraction to Decimal
- Fraction to Percent
- Simplify Fractions
- Mixed to Improper
- Significant Figures
- Factorial
- Prime Factorization
- Permutation
- Weighted Average
- Logarithm
- Cube Root
- Reciprocal
- Absolute Value
- Remainder
Money
- Tip
- Sales Tax
- Discount
- Margin
- Commission
- Roth IRA
- CD Rate
- Dividend
- Markup
- Cap Rate
- Options Profit
- Break-Even
- Blended Rate
- Reverse Sales Tax
- Bill Split
- Tip-Out
Paychecks
Percentages
Pets
Pregnancy
- Due Date
- How Far Along
- Ovulation
- Conception
- Period
- Chinese Gender
- Weight Gain
- hCG Doubling
- IVF Due Date
- Contraction Timer
Real Estate
- Home Affordability
- Rent Affordability
- Closing Cost
- Down Payment
- Price / Sq Ft
- Cash-on-Cash
- NOI
- Gross Rent Multiplier
- 70% Rule
- Rental Yield
- PMI
- Mortgage Points
- Home Sale Proceeds
- ARM
- Rent Increase
Retirement
Running
- Pace
- VO2 Max
- Running Calories
- Marathon Predictor
- Treadmill Pace
- Race Time Predictor
- Finish Time
- MPH to Pace
- Steps Per Mile
School
- GPA
- College GPA
- Cumulative GPA
- Weighted Grade
- Final Grade
- Grade
- EZ Grader
- Test Grade
- High School GPA
- Semester Grade
- Class Rank
- SAT Score
- ACT to SAT
- GPA to %
- Grade Curve
Science
- Molarity
- Dilution
- ABV
- Voltage Drop
- Ideal Gas Law
- Temperature
- Speed
- kg → lb
- miles → km
- oz → ml
- g → cups
- meters → feet
- liters → gallons
- oz → grams
- Ohm’s Law
- Density
- pH
- Force
- Molar Mass
- Kinetic Energy
- Potential Energy
- Half-Life
- Wavelength
- Mole
- RPM
- Torque
- Projectile Motion
Sizing
Sports
Tax
Tech
- Password Generator
- Hex to Decimal
- Binary to Decimal
- Download Time
- Data Storage
- Subnet
- Aspect Ratio
- PPI
- DPI
- Megapixel
- TV Size
- TV Viewing Distance
- Crop Factor
Text
- Word Counter
- Character Counter
- Words Per Minute
- Words to Minutes
- Reading Time
- Sentence Counter
- Syllable Counter
- Text Case Converter
Time & Pay
- Hour
- Overtime
- Pay Raise
- Salary
- Salary to Hourly
- Hourly to Salary
- Time Card
- PTO
- Double Time
- Biweekly Pay
- Time and a Half
Weather
Paycheck Calculators by State
- Alabama Paycheck
- Alaska Paycheck
- Arizona Paycheck
- Arkansas Paycheck
- California Paycheck
- Colorado Paycheck
- Connecticut Paycheck
- Delaware Paycheck
- District of Columbia Paycheck
- Florida Paycheck
- Georgia Paycheck
- Hawaii Paycheck
- Idaho Paycheck
- Illinois Paycheck
- Indiana Paycheck
- Iowa Paycheck
- Kansas Paycheck
- Kentucky Paycheck
- Louisiana Paycheck
- Maine Paycheck
- Maryland Paycheck
- Massachusetts Paycheck
- Michigan Paycheck
- Minnesota Paycheck
- Mississippi Paycheck
- Missouri Paycheck
- Montana Paycheck
- Nebraska Paycheck
- Nevada Paycheck
- New Hampshire Paycheck
- New Jersey Paycheck
- New Mexico Paycheck
- New York Paycheck
- North Carolina Paycheck
- North Dakota Paycheck
- Ohio Paycheck
- Oklahoma Paycheck
- Oregon Paycheck
- Pennsylvania Paycheck
- Rhode Island Paycheck
- South Carolina Paycheck
- South Dakota Paycheck
- Tennessee Paycheck
- Texas Paycheck
- Utah Paycheck
- Vermont Paycheck
- Virginia Paycheck
- Washington Paycheck
- West Virginia Paycheck
- Wisconsin Paycheck
- Wyoming Paycheck