RunCalc — Free Online Calculators

🔄 Conversions

Acres to Hectares Converter

Convert acres to hectares and hectares to acres. Used in land measurement and real estate worldwide. …

Amps to Watts Converter

Convert amps to watts using voltage. Calculate power consumption from current and voltage for any …

Bar to PSI Converter

Convert bar to PSI and PSI to bar instantly. Essential for tire pressure, hydraulics, and gas …

Binary to Decimal Converter

Convert binary numbers to decimal and decimal to binary instantly. Supports up to 64-bit numbers. …

BTU to Watts Converter

Convert BTU/hr to watts and watts to BTU/hr. Used for air conditioning, heating, and appliance …

Celsius to Fahrenheit Converter

Convert temperatures between Celsius, Fahrenheit, and Kelvin. Instant temperature conversion …

CM to Inches Converter

Convert centimeters to inches and inches to centimeters. Quick and accurate length conversion. Use …

Decimal to Fraction Converter

Convert any decimal number to a simplified fraction instantly. Shows step-by-step conversion using …

Dress Size Converter

Convert women's dress sizes between US, UK, EU, FR/ES, IT, and AU/NZ instantly. Try this free online …

Fahrenheit to Celsius Converter

Convert Fahrenheit to Celsius and Kelvin instantly. Accurate temperature conversion calculator. Use …

Feet to Meters Converter – ft to m (+ Feet & Inches to cm)

Instantly convert feet to meters or meters to feet. Also converts feet & inches to centimeters. 5ft …

Gallons to Liters Converter

Convert US gallons to liters and liters to gallons instantly. Accurate volume conversion with a …

40 Conversions calculators

📅 Date & Time

Add Days to Date Calculator

Add or subtract any number of days to a date. Find the resulting date and day of the week instantly. …

Age Calculator

Calculate your exact age in years, months, days, hours, and minutes. Find out how many days you've …

Age Difference Calculator

Calculate the exact age difference between two people in years, months, and days. This free online …

Birthday Day Calculator

Find out what day of the week you were born on and what day your next birthday falls on. Use this …

Business Days Calculator

Count the number of business days (weekdays) between two dates, excluding weekends. Try this free …

Date Difference Calculator – Days, Weeks, Months Between Two Dates

Calculate exact days, weeks, months, and years between any two dates. Instantly find how long until …

Days Between Dates Calculator

Calculate the exact number of days between two dates. Find business days, weekdays, weekends, and …

Days Until Calculator

Calculate how many days until a specific date. Countdown to birthdays, holidays, events, and …

Time Add Subtract Calculator

Add or subtract hours, minutes, and seconds from any time. Get the resulting time instantly. Use …

Time Duration Calculator

Calculate the duration between two times or add/subtract hours, minutes, and seconds from a time. …

Time Zone Converter

Convert time between time zones. See what time it is anywhere in the world right now. Try this free …

Weeks Calculator

Calculate the number of weeks between two dates or find a date a certain number of weeks from now. …

🏠 Everyday

Aspect Ratio Calculator

Calculate the aspect ratio of any width and height. Resize while maintaining proportions. Supports …

Bra Size Calculator

Find your correct bra size by entering your band and bust measurements. Get your size in US, UK, and …

Cat Age Calculator

Convert your cats age to human years. Cats age faster in their first two years. Use this free online …

Data Transfer Speed Calculator

Calculate how long it will take to transfer a file based on file size and network speed. Use this …

Dog Age Calculator

Convert your dogs age to human years using the latest scientific research. Try this free online tool …

Electricity Cost Calculator – How Much Does It Cost to Run an Appliance?

Calculate electricity cost for any appliance in seconds. Enter watts + hours used → get daily, …

Fuel Cost Calculator

Calculate trip fuel cost based on distance, fuel efficiency, and current gas price. Use this free …

Gas Mileage Calculator

Calculate your fuel efficiency in MPG or L/100km and estimate fuel costs. Try this free online tool …

Grade Calculator

Calculate your weighted average grade from multiple assignments and their weights. This free tool …

Hours Calculator

Calculate total hours worked between start and end times, with break deduction. Use this free online …

Love Calculator

Fun love compatibility calculator! Enter two names and see your love match percentage. Just for …

Moving Cost Calculator

Estimate your moving costs based on distance, home size, and number of movers needed. Use this free …

18 Everyday calculators

💰 Finance

401k Calculator

Estimate your 401(k) retirement savings growth. See how contributions, employer match, and compound …

Amortization Calculator

Calculate your loan amortization schedule, monthly payment, total interest paid, and principal …

Auto Loan Calculator

Calculate monthly car payments, total interest, and total cost of an auto loan. Try this free online …

Bond Yield Calculator

Calculate bond yield to maturity (YTM), current yield, and annual interest income for any bond. This …

Break-Even Calculator

Calculate your break-even point in units and revenue. Find out how many units you need to sell to …

Budget Calculator

Calculate your monthly budget balance. Enter your income and total expenses to see your remaining …

Business Loan Calculator

Calculate monthly business loan payments, total interest, and cost of capital for any commercial …

CAGR Calculator

Calculate Compound Annual Growth Rate (CAGR) between any two values. Find the annualized return of …

Car Lease Calculator

Calculate your monthly car lease payment. Enter vehicle price, residual value, money factor, and …

CD Calculator (Certificate of Deposit)

Calculate the maturity value and interest earned on a Certificate of Deposit (CD). Supports simple …

Compound Interest Calculator

Free compound interest calculator using A = P(1+r/n)^(nt). Enter principal, annual rate, compounding …

Cost Per Unit Calculator

Calculate the cost per unit of any product or service. Compare prices to find the best value. This …

49 Finance calculators

💪 Fitness & Health

Adjusted Body Weight Calculator

Calculate Adjusted Body Weight (AdjBW) for obese patients. Used in clinical settings for accurate …

Alcohol Unit Calculator

Calculate alcohol units in your drinks based on volume and ABV. Track weekly intake against health …

Baby Weight Percentile Calculator

Find your baby's weight percentile based on age and gender using WHO growth standards. Track healthy …

Blood Alcohol Calculator - Bac

Estimate Blood Alcohol Concentration (BAC) with the Widmark formula. See DUI legal limits by US …

Blood Alcohol Calculator - Blood Alcohol

Calculate your Blood Alcohol Content (BAC) based on drinks consumed, body weight, and time. Know …

Blood Pressure Calculator

Check your blood pressure reading and understand what your systolic and diastolic numbers mean. Find …

BMI Calculator

Free BMI calculator. Check if your weight is underweight, normal, overweight, or obese per WHO …

BMR Calculator

Free BMR calculator using Mifflin-St Jeor and Harris-Benedict equations. Find your Basal Metabolic …

Body Fat Percentage Calculator

Estimate your body fat percentage using the U.S. Navy method. Enter your measurements to get an …

Body Surface Area Calculator

Calculate your Body Surface Area (BSA) using the Mosteller, DuBois, or Haycock formula. Used for …

Calorie Deficit Calculator

Calculate the daily calorie deficit needed to reach your goal weight in your target timeframe. Based …

Child BMI Calculator – CDC Growth Chart Percentile

Calculate BMI for children and teens aged 2–19 with CDC growth chart percentile. Get age- and …

50 Fitness & Health calculators

🔢 Math

Absolute Value Calculator

Calculate the absolute value of any number or expression. |x| returns the non-negative magnitude. …

Area Calculator

Calculate the area of common shapes: rectangle, circle, triangle, and trapezoid. This free online …

Average Calculator

Calculate the mean, median, mode, and range of any list of numbers instantly. Enter comma-separated …

Binary Calculator

Perform binary addition, subtraction, multiplication, and division. Convert between binary and …

Circle Calculator

Calculate the area, circumference, and diameter of a circle from the radius. Instant results with …

Cone Volume Calculator

Calculate the volume, slant height, and surface area of a cone. Enter radius and height. Use this …

Cross Product Calculator

Calculate the cross product of two 3D vectors with step-by-step solution. Use this free online math …

Cylinder Volume Calculator

Calculate the volume and surface area of a cylinder. Enter radius and height to get instant results. …

Distance Calculator

Calculate the distance between two points using the distance formula √((x₂-x₁)² + (y₂-y₁)²).

Distance Formula Calculator

Calculate the distance between two points using the distance formula. Enter coordinates (x1,y1) and …

Exponent Calculator

Calculate powers and exponents. Find the result of any base raised to any power. This free online …

Factorial Calculator

Calculate the factorial of any non-negative integer. n! = n × (n-1) × … × 2 × 1. This free online …

55 Math calculators

Free Online Calculators

⭐ Popular Calculators