RunCalc

🏃 Running

10K Training Pace Calculator

Calculate your ideal training paces for a 10K goal time. Get easy, tempo, interval, and long-run …

5K Training Pace Calculator

Get personalized training paces for your 5K goal time. Calculate easy, tempo, interval, and long-run …

Age Graded Running Calculator – WMA Age-Grading Performance Score

Calculate your age-graded running performance score. Compare your time to world-class athletes of …

Boston Marathon Qualifying Time Calculator – BQ Time by Age & Gender

Find your Boston Marathon qualifying time based on age and gender. See the official BAA qualifying …

Heat Running Pace Adjustment Calculator – Temperature & Humidity Effect

Adjust your expected running pace for heat and humidity. Calculate how much slower to run in hot …

Running Economy Calculator

Calculate your running economy — oxygen cost per km — from your VO2max and current pace. Understand …

Running Power Calculator – Estimate Watts from Pace and Grade

Estimate your running power output in watts from pace, body weight, and terrain grade. Based on …

Running Shoe Mileage Tracker

Find out when to replace your running shoes based on current mileage, weekly usage, and shoe type. …

Running Stride Length Calculator

Calculate your running stride length from pace and cadence. Understand how stride length and cadence …

Running Training Zone Calculator – Daniels Easy, Threshold & Interval Paces

Calculate your personalized running training zones from any race performance. Get Easy, Marathon, …

Running VO2 Max Calculator – Estimate Aerobic Capacity from Race Time

Estimate your VO2 max from any race performance using the Jack Daniels oxygen cost equation. …

VDOT Calculator – Jack Daniels Running Formula

Free VDOT calculator using Jack Daniels Running Formula. Enter any race result to get VDOT score and …

33 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

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

BMI Calculator

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

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 …

Daily Water Intake Calculator

Calculate how much water you should drink daily based on your weight and activity level. Use this …

Running Pace Converter

Convert running pace between min/km and min/mile instantly. Calculate your race finish time or …

Sleep Calculator

Find the best time to sleep or wake up based on sleep cycles of 90 minutes. Use this free online …

Sleep Debt Calculator

Calculate your accumulated sleep debt based on your recommended sleep need versus actual sleep. See …

VO2 Max Estimator

Estimate your VO2 max from heart rate using the Uth-Sørensen formula. Use this free online fitness …

51 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 …

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 …

Electricity Cost Calculator — Calculate Your Energy Bill (Free)

Calculate electricity costs from watts, hours per day, and your rate per kWh. Find out exactly what …

EV Charging Calculator — Time & Cost to Charge Your Electric Car

Calculate how long it takes to charge your electric vehicle and the total cost. Enter battery size, …

Gas Cost Calculator — Trip Fuel Cost Estimator

Calculate the gas cost for any road trip. Enter distance, MPG, and gas price per gallon to get your …

Salary Calculator

Convert between hourly, weekly, monthly, and annual salary. Factor in work hours and weeks per year. …

Salary to Hourly Calculator

Convert your annual salary to an hourly rate instantly. See exactly what your time is worth. This …

Sales Tax Calculator

Calculate sales tax amount and total price including tax. This free online calculator gives you …

Savings Goal Calculator

Calculate how much you need to save per month to reach your savings goal. Plan ahead with compound …

Simple Interest Calculator

Calculate simple interest, total amount owed or earned, and interest accrued over any period. This …

53 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 …

Scientific Calculator

Free online scientific calculator with trigonometric, logarithmic, and exponential functions. …

Scientific Notation Calculator

Convert numbers to and from scientific notation. Enter any number to see its scientific notation …

Sig Fig Calculator

Count significant figures in any number and round to N significant figures. Essential for chemistry, …

Slope Calculator

Calculate the slope, angle, and equation of a line through two points. Find rise over run instantly. …

Speed Distance Time Calculator

Calculate speed, distance, or time. Enter any two values to find the third using the speed formula. …

Sphere Volume Calculator

Calculate the volume and surface area of a sphere from its radius. Instant geometric results. Use …

Square Root Calculator

Calculate the square root of any number instantly. Also shows cube root and nth root calculations. …

Standard Deviation Calculator

Calculate standard deviation, variance, mean, and more for any data set. Supports both population …

Standard Form Calculator

Convert numbers to standard form (scientific notation) or back to ordinary numbers. Try this free …

Volume Calculator

Calculate the volume of common 3D shapes: cube, sphere, cylinder, and cone. Use this free online …

55 calculators

🔄 Conversions

Acres to Hectares Converter

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

Acres to Square Feet Converter — ac to sq ft (Instant, Free)

Convert acres to square feet and square feet to acres instantly. Essential for real estate, land …

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 …

Bytes to MB Converter — Convert Bytes to Megabytes Instantly

Convert bytes to megabytes (MB) instantly. Uses the binary definition: 1 MB = 1,048,576 bytes. …

Calories to Joules Converter — cal to J (Instant, Free)

Convert food Calories (kcal) and small calories to joules instantly. Includes kJ reference, …

Celsius to Kelvin Converter — °C to K (Instant, Free)

Convert Celsius to Kelvin instantly online. Formula: K = °C + 273.15. Includes conversion table, …

CM to MM Converter — cm to mm (Instant, Free)

Convert centimeters to millimeters and millimeters to centimeters instantly. Simple formula: …

Cups to Gallon Converter — cups to gal (Instant, Free)

Convert cups to gallons instantly. Cups to US gallon conversion with formula, table, and calculator. …

Cups to Liters Converter — US Cups to Liters (Instant, Free)

Convert US cups to liters and liters to cups instantly. 1 cup = 0.236588 liters. Includes conversion …

99 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 …

Weeks Calculator

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

زمان اضافه کردن و کم کردن ماشین حساب -- اضافه کردن / کم کردن ساعت، دقیقه و ثانیه ️

اضافه کردن یا کسر ساعت، دقیقه و ثانیه از هر زمان -- فورا. مناسب برای شیفت ها، برنامه ریزی و شمارش …

ماشین حساب روزهای کاری

شمارش تعداد روزهای کاری (روزهای هفته) بین دو تاریخ، به استثنای تعطیلات آخر هفته. این ماشین حساب …

ماشین حساب مدت زمان

مدت زمان دقیق بین دو زمان را در ساعت، دقیقه و ثانیه پیدا کنید. عالی برای گزارش های کاری و زمان بندی …

ماشین‌حساب اختلاف تاریخ

تعداد روزها، هفته‌ها، ماه‌ها و سال‌های بین دو تاریخ را محاسبه کنید. مدت دقیق بین هر دو تاریخ را …

ماشین‌حساب روزهای تا تاریخ

محاسبه کنید تا یک تاریخ مشخص چند روز مانده است. شمارش معکوس برای تولدها، تعطیلات، رویدادها و …

مبدل منطقه زمانی

زمان را بین مناطق زمانی تبدیل کنید. ببینید در حال حاضر در هر نقطه از جهان چه ساعتی است. این ماشین …

محاسبه روزهای بین دو تاریخ

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

ماشین‌حساب‌های آنلاین رایگان

⭐ ماشین‌حساب‌های محبوب