General Calculators - Age, Percentage, Tips
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find age between any two dates. Free online age calculator with birthday countdown.
Aspect Ratio
Calculate aspect ratios and find equivalent dimensions. Convert between width and height while maintaining proportions. Perfect for video, images, and design.
Aspect Ratio Calculator
Calculate aspect ratios from dimensions or find missing width/height. Includes common presets for video, social media, print. Browser-based, instant results.
Dpi Calculator
Calculate DPI from image dimensions, determine print size at any resolution, or find required pixels. Presets for web, draft, and print.
Luhn Calculator
Validate any number using the Luhn algorithm or generate check digits. Universal mod-10 checksum tool for credit cards, IMEI, and ID numbers.
Markup Calculator
Calculate markup percentage, profit margin, and selling price. Find the right price for your products with our free markup and margin calculator.
Percentage Calculator
Free percentage calculator. Find X% of Y, calculate percentage increase/decrease, and solve percentage problems instantly. No signup required.
Salary Converter
Convert salary to hourly rate and vice versa. Calculate annual, monthly, weekly, daily, and hourly pay. Account for work hours and paid time off.
Tip Calculator
Free tip calculator with bill splitting. Calculate 15%, 18%, 20% tips quickly. Split the bill evenly among friends. Perfect for restaurants.
Everyday Calculation Tools
General calculators solve common everyday problems that don't require specialized knowledge but benefit from automated computation. From calculating exact ages to determining appropriate tip amounts, these tools provide instant answers to frequently needed calculations.
Popular General Calculators
Age calculators compute exact age in years, months, and days from birthdate. They account for leap years and varying month lengths, making them useful for eligibility verification, birthday planning, and age-restricted content.
Percentage calculators handle various percentage operations: finding what percentage one number is of another, calculating percentage increases or decreases, and determining values after percentage changes. Essential for analyzing discounts, tax rates, and statistical changes.
Tip calculators compute appropriate gratuity based on bill amounts and service quality. They can split bills among multiple people and include or exclude tax in tip calculations.
Salary converters translate between hourly, daily, monthly, and annual compensation rates, helping compare job offers and understand total compensation.
Common Use Cases
- Personal finance: Calculate tips, compare discounts, analyze percentage changes in investments
- Time management: Determine exact ages for legal requirements or milestone celebrations
- Career planning: Compare salary offers across different payment structures
- Daily tasks: Split bills, calculate proportions, determine fair cost sharing