Free calculators for everyday life.

Health Calculators

View all →

• BSA Calculator

  →
  Calculate body surface area (BSA) using height and weight with the Mosteller formula. Supports multiple measurement units.

• Apnea Hypopnea Index

  →
  Calculate your apnea-hypopnea index (AHI) using sleep apnea events and sleep duration. View the estimated score and severity category.

• Resting Metabolic Rate

  →
  Estimate resting metabolic rate (RMR) using age, sex, height, and weight. Find your approximate daily calories burned at rest.

• Harris Benedict

  →
  Calculate total daily energy expenditure (TDEE) using the Harris-Benedict equation and activity level. Estimate BMR and daily calorie needs.

• BEE Calculator

  →
  Estimate basal energy expenditure (BEE) using age, sex, height, and weight. Adjust the result for activity, stress, and temperature.

• Target Heart Rate

  →
  Estimate maximum and target heart rates using age and resting heart rate. View suggested exercise intensity zones.

• QTC Calculator

  →
  Calculate the corrected QT interval (QTc) using heart rate and measured QT interval with Bazett’s formula. View the estimated result in milliseconds.

• Maximum Heart Rate

  →
  Estimate maximum heart rate using the 220-minus-age formula. Calculate suggested target heart rate limits for exercise.

• Reticulocyte Index

  →
  Calculate corrected reticulocyte count and index using reticulocyte percentage and hematocrit values. Account for the maturation factor.

• Absolute Lymphocyte count

  →
  Calculate absolute lymphocyte count using lymphocyte percentage and white blood cell count. Estimate lymphocytes per cubic millimeter of blood.

• LDL Calculator

  →
  Estimate LDL cholesterol using total cholesterol, HDL, and triglyceride levels with the Friedewald formula. View the approximate LDL value.

• Blood Type

  →
  Explore possible child blood types using parental ABO and Rh blood types. View potential blood group and Rh-factor combinations.

Fitness Calculators

View all →

• Ideal Body weight

  →
  Calculate ideal body weight (IBW) using sex and height. Estimate adjusted body weight for additional clinical reference.

• Body Adiposity Index

  →
  Estimate body adiposity index (BAI) using height and hip circumference. Get an approximate indication of body fat percentage.

• Army Body Fat

  →
  Estimate body fat percentage using the US Army circumference method. Enter height, neck, waist, and applicable hip measurements.

• Relative Fat Mass

  →
  Estimate relative fat mass (RFM) using height, waist circumference, and sex. Calculate an approximate body fat percentage.

• Katch McArdle

  →
  Estimate basal metabolic rate (BMR) using the Katch-McArdle formula and lean body mass. Calculate approximate daily energy requirements.

• Calorie Calculator

  →
  Estimate daily calorie needs using age, sex, height, weight, and activity level. Use the result to plan energy intake.

• 6 Minute Walk Test

  →
  Estimate the expected six-minute walk test distance using personal measurements. Compare actual distance with predicted performance.

• FFMI Calculator

  →
  Calculate fat-free mass index (FFMI) using weight, height, and body fat percentage. View fat-free mass and normalized FFMI.

• Fat Inatke

  →
  Estimate daily fat intake using age, sex, height, weight, and activity level. Calculate a recommended fat range in grams and calories.

• Waist to Height Ratio

  →
  Calculate waist-to-height ratio using compatible waist and height units. View the ratio as a simple measure of body-size proportions.

• 1rm Calculator

  →
  Estimate one-repetition maximum (1RM) from weight lifted and repetitions completed.

• Lean Body Mass

  →
  Estimate lean body mass using body measurements and the selected calculation method.

Informative Calculators

View all →

• Absence Percentage

  →
  Calculate employee absence percentage using employee numbers, working days, and absence days. Estimate scheduled work time lost.

• Bounce Rate

  →
  Calculate website bounce rate using single-page visits and total entries. Estimate the percentage of visitors leaving after one page.

• Shoe size

  →
  Convert shoe sizes between US men’s, US women’s, UK, and EU systems using foot length. Supports adult and children’s sizing.

• Tip Calculator

  →
  Calculate the tip amount and final bill using the bill value and tip percentage. Estimate the additional tip and total cost.

• Centroid Triangle

  →
  Calculate the centroid of a triangle using the coordinates of its three vertices. Find the triangle’s geometric center.

• Post Trip Fuel

  →
  Calculate fuel consumption, fuel efficiency, and trip fuel cost. Enter fuel levels, distance traveled, and price per liter.

• Age Calculator

  →
  Calculate age in years, months, days, weeks, hours, and minutes using date of birth. Find days lived and time until your next birthday.

• Potential Flight Time

  →
  Estimate potential flight time using the relevant aircraft or flight input values.

• Gallons Per Hour Consumption

  →
  Calculate fuel consumption in gallons per hour from the entered fuel usage and time.

• Hydraulic Cylinder

  →
  Calculate hydraulic cylinder force, area, or related dimensions using the entered specifications.

• Deflection solid round beams

  →
  Estimate the deflection of a solid round beam using its dimensions, material properties, and loading conditions.

• Square Tube Center

  →
  Calculate the center or geometric properties of a square tube using its dimensions.

Conversion Calculators

View all →

• Speed Conversion

  →
  Convert speed between meters per second, kilometers per hour, miles per hour, knots, and feet per second.

• Fraction Percentage

  →
  Convert a fraction into a percentage using its numerator and denominator. Find what percentage one value represents of another.

• ASCII to Text

  →
  Convert space-separated ASCII numeric codes into readable text. Enter valid character codes to decode their corresponding text.

• Text to ASCII

  →
  Convert text into ASCII numeric codes for its characters. Enter a message to view its corresponding code values.

• Fraction to Decimal

  →
  Convert a fraction into a decimal by dividing the numerator by the denominator. View the equivalent decimal value.

• Octal to Decimal

  →
  Convert an octal number (base 8) into decimal (base 10). Enter a valid octal number containing digits from 0 to 7.

• Decimal to Octal

  →
  Convert a non-negative decimal integer (base 10) into octal (base 8). View its equivalent representation.

• Binary to Octal

  →
  Convert a binary number (base 2) into octal (base 8). Enter a valid binary value to calculate its equivalent.

• Octal to Binary

  →
  Convert an octal number (base 8) into binary (base 2). Enter a valid octal value to obtain its binary representation.

• Binary to Hex

  →
  Convert a binary number (base 2) into hexadecimal (base 16). View the result in uppercase hexadecimal notation.

• Hex to Binary

  →
  Convert a hexadecimal number (base 16) into binary (base 2). Enter a valid hexadecimal value to obtain its binary equivalent.

• Hex to Octal

  →
  Convert a hexadecimal number (base 16) into octal (base 8). Calculate the equivalent representation of a valid hexadecimal value.

Math Calculators

View all →

• Paper Weight

  →
  Calculate paper grammage in grams per square meter (GSM) using paper weight, length, and width.

• Percentage Increase

  →
  Calculate percentage increase between initial and final values. View the absolute difference and change relative to the original amount.

• Simple Interest

  →
  Calculate simple interest using principal, annual interest rate, and time. View the interest earned or paid and total amount.

• Remainder

  →
  Calculate the integer quotient and remainder when dividing a dividend by a divisor. Enter two numbers to view both results.

• Modulor

  →
  Calculate the modulo of two numbers using floor division. Find the remainder based on the selected dividend and divisor.

• Ac to Dc

  →
  Convert AC and DC current values using the calculator’s square-root-of-two conversion factor. Select the conversion direction.

• Midpoint Calculator

  →
  Calculate the midpoint between two coordinate points using their x and y values. Find the point halfway between both locations.

• Antilog Calculator

  →
  Calculate the base-10 antilogarithm by raising 10 to a specified power. Find the number corresponding to a logarithmic value.

• Mean Deviation

  →
  Calculate the mean and mean absolute deviation for a list of numbers. Estimate the average distance from the mean.

• Arctan Calculator

  →
  Calculate the inverse tangent (arctan) of a number. View the resulting angle in radians and degrees.

• Simplify Fraction

  →
  Simplify a mixed number into an improper fraction and reduce it. Enter the whole number, numerator, and denominator.

• Root Calculator

  →
  Calculate the square root or cube root of a number. Select the required root, including cube roots of negative values.

Construction Calculators

View all →

• Board Foot

  →
  Calculate board feet of lumber using thickness, width, length, and quantity. Estimate total wood volume in board feet.

• Square Feet to Cubic Yards

  →
  Convert an area and height or depth into cubic yards. Enter measurements in supported units to estimate material volume.

• Square Footage

  →
  Calculate total square footage using width, length, and quantity. Enter supported measurements to estimate the combined area.

• Asphalt Calculator

  →
  Estimate asphalt volume and weight using surface dimensions and material density. Calculate approximate tonnage for your project.

• Road Base

  →
  Calculate road base area and volume using width, length, and depth. Estimate the space that needs to be filled.

• Gravel Driveway

  →
  Estimate driveway gravel area, volume, and tonnage using width, length, and depth. Calculate approximate material requirements.

• Concrete Driveway Cost

  →
  Estimate concrete driveway costs using width, length, and depth. Calculate concrete, gravel, rebar, and combined costs using built-in rates.

• Framing Calculator

  →
  Estimate framing stud quantity and total cost using wall length, spacing, price, and waste allowance. Calculate required materials.

• Concrete Estimator Tube

  →
  Calculate concrete volume for hollow cylindrical forms using inner and outer diameters, height, and quantity. View volume in multiple units.

• Roof Pitch

  →
  Calculate roof pitch using rise and horizontal run. Estimate rafter length, roof angle, pitch percentage, and rise-per-12 ratio.

• Liters per Minute

  →
  Calculate liquid flow rate in liters per minute using volume and elapsed time. Select the time unit to obtain the flow rate.

• Taper Calculator

  →
  Calculate taper amount and angle using major diameter, minor diameter, and taper length. Find the diameter difference and corresponding angle.

Food Calculators

View all →

• Butter Calculator

  →
  Convert butter measurements between common kitchen units for easier recipe preparation.

• Baker's Percentage

  →
  Calculate baker’s percentage by comparing each ingredient’s weight with the flour weight.

• Oil to Butter

  →
  Convert butter quantities to approximate equivalent oil quantities for cooking and baking.

• Popcorn Calculator

  →
  Estimate popcorn quantities based on the amount needed or the selected serving size.

• Uncooked to Cooked Rice

  →
  Estimate cooked rice quantity from uncooked rice using the selected conversion ratio.

• Grams to Cups

  →
  Convert ingredient weights in grams to approximate cup measurements.

• Cups and mL

  →
  Convert cups to milliliters using the selected cup measurement standard.

• Pints to Cups

  →
  Convert pints to cups using the selected measurement system.

• Cups to Tablespoon

  →
  Convert cups to tablespoons for recipe measurement and portion scaling.

• Quarts to Cups

  →
  Convert quarts to cups using the selected measurement system.

• Ounces to Grams

  →
  Convert ounces to grams using the appropriate weight conversion.

• Expiration Date

  →
  Calculate an estimated expiration date by adding the selected duration to a starting date.

Real Estate Calculators

View all →

• Salary Calculator

  →
  Convert salary between hourly, daily, weekly, biweekly, monthly, and annual amounts. Estimate earnings per minute and second.

• Mortgage Payoff

  →
  Estimate mortgage payments, remaining balance, and interest with optional extra payments. Compare repayment schedules and potential interest savings.

• Refinance Calculator

  →
  Compare existing and refinanced loans using balances, rates, terms, and fees. Estimate payment changes, potential savings, and break-even time.

• Property Tax

  →
  Project property taxes using assessed value, tax rate, and annual adjustments. View estimated yearly assessments and total tax.

• Personal Loan

  →
  Estimate personal loan payments, interest, fees, and insurance costs. Calculate total repayments, net proceeds, and projected payoff date.

• Business Loan

  →
  Estimate business loan payments, interest, fees, total repayments, and APR. Enter loan details to evaluate borrowing costs.

• Credit Card

  →
  Estimate credit card payments, total interest, and repayment duration. Calculate a fixed-term payment or payoff time with regular payments.

• Mixed Number

  →
  Add, subtract, multiply, or divide mixed numbers. Enter whole numbers, numerators, and denominators to calculate a simplified result.

• Cash Back or Low Interest

  →
  Calculate cashback rewards using purchase amount and cashback percentage. View estimated rewards and the final cost after cashback.

• Inflation Calculator

  →
  Estimate how inflation changes money value over time. Calculate future purchasing power or the equivalent past value using an inflation rate.

• US Inflation

  →
  Estimate changes in US dollar purchasing power between selected years using built-in inflation data. Calculate an inflation-adjusted amount.

• UK Mortgage

  →
  Estimate UK mortgage payments using property price, deposit, interest rate, and term. Optionally include taxes, insurance, and other costs.

Medical Calculators

View all →

• Mean Arterial Pressure

  →
  Calculate mean arterial pressure (MAP) from systolic and diastolic blood pressure. View the estimated pressure and general category.

• Maintenance Fluids

  →
  Estimate maintenance fluids using body weight and the 4-2-1 hourly rule. Calculate maintenance rates and a weight-based fluid bolus.

• Serum Anion Gap

  →
  Calculate serum anion gap using sodium, chloride, and bicarbonate. View corrected results, delta gap, delta ratio, and preliminary interpretation.

• Meld Na (UNOS/OPTN)

  →
  Estimate MELD and MELD-Na scores using creatinine, bilirubin, INR, and sodium. View calculated scores and estimated mortality category.

• Fractional Excretion of Sodium

  →
  Calculate fractional excretion of sodium (FENa) using serum and urine sodium and creatinine. View the percentage and general interpretation.

• Creatinine Clearance

  →
  Estimate creatinine clearance using the Cockcroft-Gault equation, age, sex, weight, and serum creatinine. View adjusted-weight estimates in mL/min.

• Sodium Correction for Hyperglycemia

  →
  Calculate corrected sodium levels in hyperglycemia using the Katz and Hillier correction factors.

• Fibrosis-4 (FIB-4)

  →
  Calculate the FIB-4 score using age, AST, ALT, and platelet count to assess liver fibrosis risk.

• ASCVD

  →
  Estimate 10-year ASCVD risk using cholesterol, blood pressure, age, and other cardiovascular risk factors.

• Free Water Deficit Hypernatremia

  →
  Estimate the free water deficit using body weight, sodium levels, age, and sex.

• Inhalation Injury

  →
  Assess inhalation injury severity by selecting bronchoscopic findings to determine the injury grade.

• Age-Adjusted ESR/CRP

  →
  Calculate age-adjusted ESR reference limits based on age and sex, with a fixed CRP reference value.

Finance Calculators

View all →

• VAT Calculator

  →
  Calculate value-added tax (VAT), tax amount, net price, and final price. Estimate costs with or without VAT.

• Margin Calculator

  →
  Calculate profit, profit margin, and markup using cost and revenue. Understand profitability relative to selling price and cost.

• Debt to Asset Ratio

  →
  Calculate the debt-to-asset ratio using total debt and assets. Estimate the percentage of assets financed by debt.

• Market Capitalization

  →
  Calculate market capitalization by multiplying share price by outstanding shares. Estimate a company’s total equity market value.

• Enterprise Value

  →
  Calculate enterprise value using market capitalization, debt, cash, preferred shares, and minority interest. Estimate overall company value.

• Sales Tax

  →
  Calculate sales tax using the net price and tax rate. Estimate the tax amount before adding it to the purchase price.

• Stock Calculator

  →
  Estimate stock investment profit or loss using share prices, quantity, commissions, and tax. View costs, net returns, and break-even price.

• Percent Off

  →
  Calculate savings and final price after a percentage discount. Optionally apply a second discount to estimate additional savings.

• Price Elasticity of Demand

  →
  Calculate price elasticity of demand using initial and final prices and quantities. Compare revenue before and after the change.

• EBIT Calculator

  →
  Calculate earnings before interest and taxes (EBIT) using the financial inputs supported by the calculator. Estimate earnings before interest and tax expenses.

• EBITDA Calculator

  →
  Calculate EBITDA by adding depreciation and amortization to operating profit. Estimate business earnings before these expenses.

• WACC Calculator

  →
  Calculate weighted average cost of capital (WACC) using equity, debt, financing costs, and tax rate. Estimate the business’s average capital cost.