Calculators
Free online calculators for everyday use. BMI, tip, age, percentage, discount, and date calculations.
Percentage Calculator
Free online percentage calculator. Calculate percentages, percentage change, and find what percent one number is of another.
BMI Calculator
Free online BMI calculator. Calculate your Body Mass Index using metric or imperial units.
Tip Calculator
Free online tip calculator. Calculate tip amount and split the bill. Choose tip percentage and number of people.
Age Calculator
Calculate your exact age online. Find years, months, and days between your birth date and today.
Pomodoro Timer
Stay focused with the Pomodoro Technique. 25-minute work sessions with 5-minute breaks. Customizable intervals.
Countdown Timer
Set a custom countdown timer. Get an alert when time runs out. Quick presets for common durations.
Stopwatch
Online stopwatch with lap timing. Record split times, pause and continue. Precise millisecond display.
Calendar
View any month and year. Simple, clean monthly calendar with navigation.
Date Difference Calculator
Calculate the difference between two dates. Get days, weeks, months, and years between any two dates.
Running Pace Calculator
Calculate running pace per km/mile and speed. Quick presets for 5K, 10K, half and full marathon.
Sales Tax Calculator
Calculate sales tax and final price. US state presets and reverse calculation included.
GPA Calculator
Calculate your GPA by entering course grades and credits. Supports standard 4.0 scale.
Ratio Calculator
Solve ratio and proportion problems. Find the missing value in A:B = C:D.
Fraction to Decimal
Convert fractions to decimals and decimals to fractions. Detects repeating decimals.
Compound Interest Calculator
Calculate compound interest on investments. See how your money grows over time with regular contributions.
Loan Calculator
Calculate monthly loan payments, total interest, and see full amortization breakdown.
Discount Calculator
Free online discount calculator. Calculate sale price after discount, original price before discount.
moon-phase
Check the current moon phase for any date. See illumination, next full moon, and next new moon.
savings-goal
Calculate how long to reach your savings goal with monthly contributions and compound interest.
budget-50-30-20
Split your income using the 50/30/20 rule. See how much for needs, wants, and savings.
weight-on-planets
See how much you would weigh on different planets. Fun gravity comparison.
sleep-calculator
Calculate ideal bedtimes based on 90-minute sleep cycles. Wake up refreshed by timing your sleep right.
macro-calculator
Calculate your daily macronutrient needs. Set calories and adjust protein, carb, and fat ratios.
ideal-weight
Calculate your ideal body weight using Robinson, Miller, and Hamwi formulas based on height and gender.
water-intake
Calculate your daily water intake needs based on weight and activity level.
body-fat
Calculate your body fat percentage using the US Navy method. Neck, waist, and hip measurements required.
retirement
Plan your retirement savings. See how your savings grow with monthly contributions and compound interest.
square-footage
Calculate square footage and square meters for rooms. Add multiple rooms for total area.
tips-percentage
Quickly calculate the tip amount and total bill. Adjust tip percentage with an easy slider.
commission
Calculate commission amounts based on sale price and commission rate.
paint-calculator
Estimate how much paint you need for a room. Based on wall dimensions, doors, and windows.
concrete-calculator
Calculate the volume of concrete needed for a project in cubic yards or cubic meters.
ovulation
Estimate your ovulation date and fertile window based on your last period and cycle length.
gratuity
Calculate end-of-service gratuity based on basic salary and years of service.
fence-calculator
Estimate fence materials needed. Calculate posts, rails, and pickets based on perimeter and height.
blood-alcohol
Estimate your blood alcohol content based on drinks consumed, body weight, and time elapsed.
Add/Subtract Days
Add or subtract days from any date. Find future and past dates instantly.
BMR Calculator
Calculate your Basal Metabolic Rate and daily calorie needs.
Days Until Calculator
Count days until any date. See weeks, months, and business days remaining.
Pregnancy Due Date Calculator
Calculate estimated due date from last menstrual period.
Leap Year Checker
Check if a year is a leap year. See nearby leap years.
Ohms Law Calculator
Calculate voltage, current, resistance, and power using Ohms Law.
Wind Chill Calculator
Calculate wind chill temperature. What it really feels like.