All Calculators & Converters
Directory of all 31 verified, mobile-first calculators for common life, time, business, and unit-conversion tasks.
All Calculators (31)
Percentage Calculator
Calculate percentages, percentage change, and reverse percentages.
Age Calculator
Find exact chronological age in years, months, weeks, and days.
Date Difference Calculator
Calculate calendar duration between two dates in years, months, and days.
Days Between Dates Calculator
Count total elapsed days, weeks, and weekdays between two calendar dates.
Hours Calculator
Calculate elapsed hours and minutes between clock times across midnight.
Discount Calculator
Calculate sale savings, stacked percentage discounts, and final prices.
Tip Calculator
Calculate restaurant tips, total bill with tip, and split per person.
Average Calculator
Calculate arithmetic mean, median, sum, and count from numbers.
Profit Margin Calculator
Calculate gross profit, margin percentage, and target selling price.
Markup Calculator
Find markup amount, selling price, and equivalent gross margin.
Break-even Calculator
Determine break-even units and revenue from fixed and variable costs.
VAT Calculator
Add VAT to net amount or extract VAT from gross total.
Sales Tax Calculator
Calculate tax amount and total price or reverse tax from gross.
Commission Calculator
Calculate sales commissions, base pay additions, and sales targets.
Hourly to Salary Calculator
Convert hourly wage to weekly, monthly, and annual gross earnings.
Salary to Hourly Calculator
Convert annual salary into equivalent hourly, weekly, and monthly rates.
Time Zone Converter
Convert times across world timezones with automatic daylight saving.
Unix Timestamp Converter
Convert Unix epoch timestamps in seconds or milliseconds to human date/time.
Business Days Calculator
Count working business days between dates excluding weekends and holidays.
Working Hours Calculator
Calculate billable working hours across date ranges accounting for shift times and breaks.
Countdown Calculator
Count down remaining days, hours, and minutes until any future event date.
Length Converter
Convert meters, feet, inches, centimeters, kilometers, and miles.
Weight / Mass Converter
Convert kilograms, pounds, ounces, grams, stones, and metric tonnes.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with absolute zero validation.
Area Converter
Convert square meters, square feet, acres, hectares, and square kilometers.
Volume Converter
Convert liters, milliliters, gallons, cups, and fluid ounces with US/imperial distinction.
Speed Converter
Convert km/h, mph, m/s, knots, and ft/s.
Data Storage Converter
Convert bytes, decimal SI units (MB, GB, TB), and binary IEC units (MiB, GiB, TiB).
Time Unit Converter
Convert seconds, minutes, hours, days, weeks, and milliseconds.
Pressure Converter
Convert Pascals, bar, atmospheres, psi, and mmHg/torr.
Energy Converter
Convert Joules, kilowatt-hours, calories, and BTU with exact physical constants.