RunCalc

🏃 Running

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 …

Lactate Threshold Pace Calculator

Calculate your lactate threshold pace from recent race times. Find the exact pace for tempo runs to …

Marathon Pace Calculator – 26.2 Mile Split Planner

Calculate your required marathon pace for any goal finish time. Get per-km, per-mile pace and key …

Marathon Wall Calculator

Predict when you'll hit the wall in a marathon based on your glycogen stores, pace, and body weight. …

Race Day Nutrition Calculator

Plan your complete race day nutrition including pre-race carb loading and in-race fueling. …

Race Fuel Calculator

Calculate exactly how many gels, chews, or carbs you need during a race based on your finish time, …

Race Pace Calculator – Required Pace for Any Finish Time

Calculate the exact pace per km and per mile needed to finish any race in your goal time. Perfect …

Race Time Predictor – Predict Finish Time Using Riegel Formula

Predict your finish time for any race distance based on a recent race performance. Uses the Riegel …

Run Walk Interval Calculator – Galloway Method Pace Estimator

Calculate your effective pace using Jeff Galloway's run-walk-run method. Enter your running pace and …

Running Cadence Calculator

Find your optimal running cadence (steps per minute) based on your height and pace. Improve …

Running Hydration Calculator

Calculate your fluid needs for running based on sweat rate, temperature, humidity, and duration. …

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 …

34 calculators

💪 Fitness & Health

Child BMI Calculator – CDC Growth Chart Percentile

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

Creatine Calculator

Calculate your optimal daily creatine dosage based on body weight. This free online calculator gives …

Daily Fiber Calculator

Calculate your recommended daily fiber intake based on age, sex, and calorie needs. Improve …

Daily Protein Intake Calculator

Calculate how much protein you need daily based on your weight, goal, and activity level. Use this …

Daily Water Intake Calculator

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

Exercise Recovery Time Calculator

Estimate how long you need to recover between workouts based on exercise intensity, type, and your …

Macro Calculator

Calculate your daily macronutrient needs (protein, carbs, fat) based on your goals. Try this free …

Macro Ratio Calculator

Calculate your ideal macronutrient ratio for fat loss, muscle gain, or maintenance. Try this free …

Pregnancy Due Date Calculator

Calculate your estimated due date based on the first day of your last menstrual period (LMP). Also …

Pregnancy Week Calculator

Find out exactly how many weeks pregnant you are based on your last menstrual period. Track your …

Pregnancy Weight Gain Calculator

Calculate recommended weight gain during pregnancy based on your pre-pregnancy BMI and current week …

Push-Up Calorie Calculator

Calculate calories burned doing push-ups based on your weight, number of reps, and sets. Estimate …

44 calculators

💰 Finance

CAGR Calculator

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

Cost Per Unit Calculator

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

Debt-to-Income Ratio Calculator

Calculate your debt-to-income (DTI) ratio to see if you qualify for a mortgage or other loans. This …

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 …

Income Tax Calculator

Estimate your federal income tax based on US tax brackets for 2024. Use this free online financial …

Loan Payment Calculator

Free loan calculator. Enter principal, annual rate, and term to get monthly payment, total interest …

Margin Calculator

Calculate trading margin, profit margin percentage, markup, and gross profit for any product or …

Markup Calculator

Calculate selling price from cost and markup percentage. Find the right price for your products. …

Profit Margin Calculator

Calculate profit margin, gross profit, and markup from revenue and cost. Essential business …

Rent Affordability Calculator

Find out how much rent you can afford based on your income using the 30% rule. Try this free online …

56 calculators

🔢 Math

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 …

Logarithm Calculator

Calculate logarithms with any base. Natural log (ln), common log (log10), and custom base …

Long Division Calculator

Perform long division step-by-step. Enter a dividend and divisor to get the quotient, remainder, and …

Matrix Calculator

Calculate matrix determinant, inverse, transpose, and multiplication. Supports 2x2 and 3x3 matrices. …

Polynomial Calculator

Evaluate a polynomial expression at a given value of x. Supports ax³ + bx² + cx + d form. Use this …

Prime Factorization Calculator

Find the prime factors of any number. Displays the prime factorization with exponents. Try this free …

Prime Number Checker

Check if a number is prime and find its factors. Use this free prime checker to instantly test any …

Probability Calculator

Calculate probability of events. Enter favorable outcomes and total outcomes to find probability, …

Proportion Calculator

Solve proportions and cross-multiplication problems. Find the missing value in A/B = C/D instantly …

Pythagorean Theorem Calculator

Calculate any side of a right triangle using the Pythagorean theorem (a² + b² = c²). Find hypotenuse …

Quadratic Formula Calculator

Solve quadratic equations (ax² + bx + c = 0) and find roots using the quadratic formula. Use this …

61 calculators

🔄 Conversions

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 …

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 …

Cups to Oz Converter — Cups to Fluid Ounces (Instant, Free)

Convert cups to fluid ounces and oz to cups instantly. Simple multiplication by 8 for US cups. …

Days to Hours Converter — days to hr (Instant, Free)

Convert days to hours and hours to days instantly. Includes conversion table, running training …

Decimal to Fraction Converter

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

Fahrenheit to Kelvin Converter — °F to K (Instant, Free)

Convert Fahrenheit to Kelvin instantly online. Formula: K = (°F − 32) × 5/9 + 273.15. Includes …

Feet to Inches Converter — ft to in (Instant, Free)

Convert feet to inches and inches to feet instantly. Simple formula: multiply feet by 12. Includes …

101 calculators

📅 Date & Time

Business Days Calculator

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

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. …

מחשבון גיל

חשב את גילך המדויק בשנים, חודשים, ימים, שעות ודקות. גלה כמה ימים חייתָ. מחשבון תאריך וזמן חינמי ללא …

מחשבון הוספת ימים לתאריך

חשב תאריך עתידי או עבר על ידי הוספה או חיסור ימים. מחשבון תאריכים חינמי ומיידי לכל שימוש.

מחשבון הפרש תאריכים

חשב את מספר הימים, השבועות, החודשים והשנים בין שני תאריכים. מצא את המשך המדויק בין כל שני תאריכים. …

מחשבון הפרשי גיל

חשב את הפרש הגיל המדויק בין שתי אנשים בשנים, חודשים וימים. מחשבון תאריכים חינמי מקוון, תוצאות …

מחשבון יום הולדת

גלה באיזה יום בשבוע נולדת ובאיזה יום יחול יום ההולדת הבא שלך. השתמש במחשבון תאריכים חינמי זה לתוצאות …

מחשבון ימים בין תאריכים

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

מחשבון ימים עד תאריך

חשב כמה ימים נותרו עד תאריך ספציפי. ספירה לאחור לימי הולדת, חגים, אירועים ומועדים. נסה את מחשבון …

13 calculators

🔨 Construction & DIY

מחשבון מטר מעוקב

מחשבון מטר מעוקב בחינם. להמיר מידות אורך, רוחב ועומק למאתרים מעוקבים, רגל מעוקב ומטר מעוקב באופן …

מחשבונים מקוונים בחינם

⭐ מחשבונים פופולריים