Calculators
23 tools available
Calculate percentages, age, discounts, tips, BMI and more.
Age Calculator
Calculate your exact age in years, months, and days from your date of birth. See total days lived and next birthday countdown.
Aspect Ratio Calculator
Calculate aspect ratios from width and height. Resize dimensions proportionally with common presets and a visual preview.
Average Calculator
Calculate mean, median, mode, range, and more for any number set. Includes weighted average mode and a visual distribution of your data.
BMI Calculator
Calculate your Body Mass Index with metric or imperial units. See your BMI category and where you fall on the visual scale.
Compound Interest Calculator
Calculate compound interest with optional monthly contributions. See year-by-year growth, total interest earned, and final balance.
Countdown Timer
Set a countdown timer with hours, minutes, and seconds. Quick presets, progress bar, and audio alert when time is up.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days, weeks, hours, and minutes. Add or subtract days from any date.
Discount Calculator
Calculate sale prices, savings, and final cost after single or stacked discounts with optional tax. Free and instant.
Electricity Cost Calculator
Calculate electricity costs for appliances by wattage, usage hours, and rate. See daily, weekly, monthly, and yearly costs with appliance presets.
Fraction Calculator
Add, subtract, multiply, and divide fractions or mixed numbers. Results are automatically simplified with step-by-step solutions.
GPA Calculator
Calculate your weighted or unweighted GPA by adding courses with letter grades and credit hours. See your GPA on a visual scale.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and view an amortization schedule. Compare loan terms and see principal vs interest.
Online Stopwatch
Free online stopwatch with lap times. Start, stop, and reset with a clean interface. Record splits and export lap data.
Percentage Calculator
Calculate percentages instantly with three modes - find X% of Y, what percent X is of Y, or reverse percentage calculations.
Pomodoro Timer
Free online Pomodoro timer with customizable work and break sessions, circular progress display, and audio notifications.
Salary Calculator
Convert your salary between annual, monthly, biweekly, weekly, daily, and hourly rates. Factor in tax to see take-home pay instantly.
Scientific Calculator
Free online scientific calculator with trig functions, logarithms, exponents, memory, parentheses, and a history of recent calculations.
Standard Deviation Calculator
Calculate standard deviation, variance, mean, and more for any data set. Supports both population and sample calculations with step-by-step breakdowns.
Subnet Calculator
Calculate network address, broadcast address, usable host range, wildcard mask, and IP class from any IP address and CIDR or subnet mask.
Time Zone Converter
Convert times between world time zones instantly. See current time in any zone, swap source and target, and use common timezone presets.
Tip Calculator
Calculate tips and split bills easily. Quick preset buttons for 10-25% tips with custom option and per-person splitting.
Typing Speed Test
Test your typing speed and accuracy with real-time WPM tracking. Choose from multiple difficulty levels and get a full performance breakdown.
Watts to Amps Calculator
Convert between watts and amps for DC, single-phase AC, and three-phase AC circuits. Includes power factor input and a common appliance reference table.