Calculator Directory
Browse our suite of precision tools designed for professionals and everyday use.
Construction & Engineering
Heavy duty tools for contractors, builders, and DIY projects.
Tire Size CalculatorMulch CalculatorRoofing Calculator+more
Health & Fitness
Track your body metrics, nutrition goals, and metabolic health.
Dew Point CalculatorWind Chill CalculatorHeat Index Calculator+more
Everyday Life
Useful tools for time, age, and daily planning.
Salary CalculatorIncome Tax CalculatorCurrency Calculator+more
Math & Finance
Percentages, conversions, and financial estimates.
Salary CalculatorIncome Tax CalculatorCurrency Calculator+more
All Tools
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Salary Calculator
Convert your salary between hourly, weekly, bi-weekly, monthly, and annual pay. See your gross income breakdown.
Income Tax Calculator
Estimate your 2024 Federal Income Tax. Calculate effective tax rate, tax brackets, and take-home pay based on filing status.
Currency Calculator
Convert between major world currencies (USD, EUR, GBP, JPY, etc.). Instant exchange rate estimates for travelers and shoppers.
Zakat Calculator
Calculate your annual Zakat (2.5%) based on your assets, gold, savings, and liabilities. Supports custom Nisab thresholds.
Password Generator
Create strong, secure passwords instantly. Customize length and characters to protect your accounts.
Dice Roller
Roll virtual dice instantly. Supports D6, D20, D100 and custom sides. Perfect for board games, D&D, and math.
Random Number Generator
Generate random numbers and lists.
Day Counter
Calculate the number of days between two dates. Counts business days, weekends, and total duration.
Shoe Size Conversion
Convert shoe sizes between US, UK, EU, and CM. Accurate charts for Men and Women.
Day of the Week Calculator
Find the day of the week for any date. Check what day you were born, or find out what day a future event falls on.
Dew Point Calculator
Calculate dew point temperature and comfort level from relative humidity and air temperature.
Wind Chill Calculator
Calculate the "feels like" temperature and frostbite risk based on wind speed and air temperature.
Heat Index Calculator
Calculate what the temperature really feels like based on relative humidity. Uses NOAA formulas.
Gas Mileage Calculator
Calculate your car's MPG (Miles Per Gallon). Enter odometer readings or distance and fuel to track efficiency.
Weight Calculator
Convert between weight units like Kilograms (kg), Pounds (lbs), Stones (st), and Ounces. Instant conversion for health and cooking.
Tip Calculator
Calculate gratuity and split the bill between any number of people. Fast and easy tipping.
Love Calculator
Test the compatibility between two names. Find out your love score percentage and relationship forecast.
Time Card Calculator
Calculate weekly work hours and gross pay. Track daily clock-in/out times, breaks, and overtime automatically.
Fuel Cost Calculator
Calculate the total cost of gas or diesel for a trip. Estimate fuel needed based on distance and MPG.
Bra Size Calculator
Find your perfect bra fit. Calculate US, UK, and EU sizes based on your band and bust measurements.
Grade Calculator
Calculate your current class grade and what you need on the final exam. Supports weighted percentages and point-based grading.
Hours Calculator
Calculate total work hours for payroll or timesheets. Sum multiple time intervals and calculate gross pay with overtime support.
Date Calculator
Add or subtract days, weeks, months, and years from a date. Calculate the exact duration between two dates.
Bandwidth Calculator
Calculate download time for files or data transfer speed. Convert between Mbps, MB/s, and GB instantly.
Sleep Calculator
Calculate the best times to go to bed or wake up based on 90-minute sleep cycles.
Tire Size Calculator
Compare two tire sizes. Check speedometer error, diameter difference, and sidewall height changes.
Golf Handicap Calculator
Calculate your World Handicap System (WHS) index. Track differentials for up to 20 rounds of golf.
Mileage Calculator
Calculate gas mileage (MPG) and estimate fuel costs for trips.
Basic Calculator
Simple online calculator.
Conversion Calculator
Convert length, weight, volume, temperature, and more.
Time Zone Calculator
Convert time between cities and zones. Check local times worldwide.
GPA Calculator
Calculate college or high school GPA.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Average Calculator
Calculate the mean, median, and sum of a data set.
Standard Deviation
Calculate sample and population SD.
Time Calculator
Add or subtract hours/minutes to time. Calculate duration.
Age Calculator
Calculate precise age.
Time Difference
Duration between times.
Mulch Calculator
Calculate how much mulch you need in cubic yards and bags. Estimate costs for flower beds and landscaping.
Roofing Calculator
Estimate roof area, number of squares, and shingle bundles needed based on house dimensions and pitch.
BTU Calculator
Calculate the required BTU capacity for air conditioners or heaters based on room size and insulation.
Electricity Calculator
Calculate electricity costs for any appliance. Estimate daily, monthly, and yearly energy bills based on power consumption (Watts).
Gravel Calculator
Estimate tons and cubic yards of gravel, sand, or topsoil needed for your project. Supports driveways and circular beds.
Tile Calculator
Calculate how many tiles you need for floors and walls. Estimate boxes required including waste allowance.
Ohms Law Calculator
Calculate voltage, current, resistance, and power. Find any two variables given the others using Ohm's Law.
Resistor Calculator
Identify resistor values by color bands. Supports 4-band and 5-band resistors with tolerance calculation.
Stair Calculator
Calculate rise, run, and stringer length for building stairs. Optimize step height and tread depth.
Horsepower Calculator
Calculate car horsepower from Torque/RPM or 1/4 mile drag racing times.
Engine Horsepower Calculator
Calculate engine horsepower output from torque and RPM. Useful for engine tuning and performance estimation.
Square Footage Calculator
Calculate sq ft for flooring, painting, and construction. Add multiple rooms and estimate costs.
Concrete Calculator
Estimate cubic yards and bags for slabs.
Voltage Drop Calculator
Calculate voltage drop, percentage loss, and wire size requirements.
Concrete Bag Calculator
Count premix bags needed.
Post Hole Calculator
Concrete for fence posts.
Concrete Volume
Calculate cubic yards.
Concrete Slab
For patios & driveways.
Concrete Block
Count blocks for walls.
Concrete Weight
Calculate mass & tons.
Concrete Cost
Estimate project price.
Pipe Weight
Calculate pipe mass.
Roman Numeral Converter
Convert numbers to Roman numerals and back. Learn the symbols (I, V, X, L, C, D, M) and rules.
Molarity Calculator
Calculate molarity, mass, or volume. Useful for preparing chemical solutions in the lab.
Molecular Weight Calculator
Calculate the molar mass of chemical compounds. Supports complex formulas with parentheses.
Speed Calculator
Calculate Speed, Distance, or Time. Convert between mph, kph, m/s, and knots.
Mass Calculator
Calculate mass, density, or volume. Includes presets for common materials like steel, gold, and water.
Density Calculator
Calculate density, mass, and volume. Convert between kg/mยณ, g/cmยณ, and lb/ftยณ.
Water Intake Calculator
Calculate daily water intake needs based on weight and activity.
BMI Calculator
Check your Body Mass Index.
Height Calculator
Predict a child's future adult height.
Lean Body Mass
Calculate LBM using Boer, James, and Hume formulas.
Body Type Calculator
Determine your body shape (Hourglass, Pear, Apple) based on measurements.
Army Body Fat Calculator
Calculate body fat percentage based on US Army standards (AR 600-9).
Body Fat Calculator
Estimate body fat percentage.
WW Points Calculator
Calculate SmartPoints, PointsPlus, and Classic points for food.
BAC Calculator
Estimate Blood Alcohol Content and time to sober.
Due Date Calculator
Calculate your baby due date based on last period, conception, or IVF.
Ideal Weight Calculator
Find your IBW using Devine, Hamwi & Robinson formulas.
Overweight Calculator
Calculate excess weight and BMI category.
Anorexic BMI Calculator
Screen for underweight and anorexia risks.
BSA Calculator
Calculate Body Surface Area.
Healthy Weight
Find your ideal weight range.
TDEE Calculator
Calculate Total Daily Energy Expenditure.
Protein Calculator
Calculate daily protein needs for muscle & fat loss.
Fat Intake Calculator
Calculate daily fat grams for Keto, Low Carb, or balanced diets.
GFR Calculator
Estimate Glomerular Filtration Rate (eGFR).
One Rep Max
Calculate 1RM strength limit.
Target Heart Rate
Find your HR zones for fat burn and cardio training.
Conception Calculator
Calculate likely conception date.
Ovulation Calculator
Track your most fertile days and predict your next period.
Period Calculator
Predict your next menstrual cycle and period dates.
Pregnancy Conception
Find out when you likely conceived.
Pregnancy Weight Gain
Track healthy weight gain ranges by week.
Carbohydrate Calculator
Calculate daily carbs for Keto, Low Carb, or balanced diets.
Pace Calculator
Calculate running pace, time, or distance.
Pregnancy Calculator
Calculate due date & weeks pregnant.
Intermittent Fasting
Plan fasting windows and daily calories (16:8, OMAD).
Recipe Calculator
Calculate calories per serving for homemade meals.
Steps to Calories
Convert walking steps to calories burned.
Calories Burned
Calculate energy burned by activity.
Weight Loss Calculator
Calculate calorie deficit for fat loss.
Weight Gain Calculator
Calculate calorie surplus for muscle building (bulking).
Macro Calculator
Calculate optimal protein, carbs, and fats.
Basal Metabolic Rate
BMR & daily calorie needs.
Maintenance Calories
Daily calorie needs.
GDP Calculator
Calculate Gross Domestic Product using Expenditure and Income methods.
Big Number Calculator
Arithmetic with arbitrarily large integers.
Long Division Calculator
Perform long division with step-by-step tableau.
Matrix Calculator
Perform matrix addition, subtraction, and multiplication.
Common Factor Calculator
Find all common factors of two or more numbers.
Factor Calculator
Find all factors and factor pairs of a number.
LCM Calculator
Calculate Least Common Multiple.
Right Triangle Calculator
Calculate sides and angles of a right triangle.
Surface Area Calculator
Calculate surface area of 3D shapes.
Distance Calculator
Calculate distance between two points (2D & 3D).
Confidence Interval
Calculate CI for sample mean with Z-score.
Permutation & Combination
Calculate nPr and nCr. Order matters vs Order does not matter.
Statistics Calculator
Compute mean, median, mode, SD, and variance.
Sample Size Calculator
Calculate the number of respondents needed for a survey.
Quadratic Formula Calculator
Solve quadratic equations (axยฒ + bx + c = 0) for x.
Log Calculator
Calculate logarithms for any base, including ln and log10.
Hex Calculator
Add, subtract, multiply, and divide hexadecimal numbers.
Exponent Calculator
Calculate powers and exponents ($x^n$).
Number Sequence
Find next terms for Arithmetic, Geometric, and Fibonacci sequences.
Triangle Calculator
Solve for area, angles, and sides of any triangle.
Prime Factorization
Decompose integers into prime factors.
Scientific Notation
Convert decimals to scientific notation and vice versa.
Rounding Calculator
Round numbers to decimal places, nearest multiples, or sig figs.
Greatest Common Factor
Calculate GCF (GCD) of numbers.
Root Calculator
Calculate square roots, cube roots, and nth roots.
Pythagorean Theorem Calculator
Solve for the hypotenuse or missing leg of a right triangle.
Circle Calculator
Calculate radius, diameter, area, and circumference.
Ratio Calculator
Simplify ratios and solve proportions (A:B = C:D).
Z-Score Calculator
Calculate Z-score and probability (percentile).
P-Value Calculator
Calculate P-values from Z, T, Chi-Square, and F statistics.
Mean, Median, Mode, Range
Calculate statistical average, middle, most frequent value, and range.
Probability Calculator
Calculate probability of single or multiple events.
Area Calculator
Calculate area of circles, rectangles, triangles, and more.
Slope Calculator
Calculate slope, distance, and equation of a line.
Half-Life Calculator
Calculate radioactive or drug half-life decay.
Binary Calculator
Add, subtract, multiply, and divide binary numbers.
IP Subnet Calculator
Calculate network, broadcast, and host ranges.
Percent Error Calculator
Calculate percentage error.
Percentage Change
Calculate increase/decrease.