Free Online Calculators - Percentage, Age, Unit, RAID & More
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.
Age From Date
Calculate exact age from any birth date. See age in years, months, days, and upcoming birthday countdown. Works for people, pets, or any event.
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.
Bandwidth Calculator
Calculate transfer times from file size and bandwidth. Estimate data usage, check caps, plan downloads. Supports all common speed units.
Binary Decimal
Convert binary to decimal and decimal to binary real-time. Bidirectional conversion with step-by-step explanation. Confidential processing.
Celsius To Fahrenheit
Convert °C to °F for weather, cooking, or fever checks. Uses formula (°C × 9/5) + 32. Quick reference table included.
CIDR Calculator
Calculate subnets, IP ranges, and network addresses from CIDR notation. Find usable hosts, broadcast address, and wildcard mask. Essential networking tool.
Cloud Storage Calculator
Estimate cloud storage costs for AWS S3, Azure Blob, Google Cloud. Compare pricing, egress fees, operations. Free, browser-based calculator.
Cm To Inches
Convert centimeters to inches for clothing sizes, screen dimensions, and DIY projects. Instant metric-to-imperial conversion. 1 cm = 0.3937 in.
Csv To Geojson
Convert CSV coordinates to GeoJSON for mapping. Select lat/lng columns, customize properties. Works with Leaflet, Mapbox. Private.
Damage Calculator
Calculate damage output for RPGs and MMOs. Input stats like attack, defense, crit rate, and multipliers. Supports common damage formulas and custom equations.
Date Calculator
Calculate dates by adding or subtracting days, weeks, months, or years. Find the difference between two dates. Perfect for deadline and schedule planning.
Dpi Calculator
Calculate DPI from image dimensions, determine print size at any resolution, or find required pixels. Presets for web, draft, and print.
Dps Calculator
Calculate DPS (damage per second) for any game. Factor in attack speed, cooldowns, crit rate, and buffs. Compare builds and optimize your damage output.
Exp Calculator
Calculate experience points needed to level up. Track progress, estimate grinding time, and plan your leveling route. Works with custom EXP curves.
Fahrenheit To Celsius
Convert Fahrenheit to Celsius instantly. Use formula °C = (°F - 32) × 5/9. Fast, accurate temperature conversion. No signup, works offline.
Feet to Meters Converter
Convert feet to meters with one click. Handles feet-and-inches, adjustable precision, and a quick reference table. Works offline in your browser.
File Size Calculator
Calculate file sizes, storage capacity, and transfer times. Convert between KB, MB, GB, TB. Plan backups and estimate bandwidth needs.
Gallons To Liters
Convert gallons to liters instantly. 1 gallon (US) = 3.78541 liters. Fast, accurate volume conversion. No signup, works offline.
Geojson To Csv
Convert GeoJSON to CSV for GIS analysis and spreadsheets. Extract coordinates, properties, geometry data. Client-side, no uploads.
Gpx To Csv
Convert GPX files to CSV for Excel analysis. Extract waypoints, tracks, routes from Garmin and Strava. Browser-based, no uploads.
Grams To Ounces
Convert grams to ounces instantly. 1 gram = 0.035274 oz. Fast, accurate weight conversion for cooking and weighing. No signup, works offline.
Hex Decimal
Convert hexadecimal to decimal and decimal to hex with color preview. Bidirectional conversion, quick results. 100% local execution.
Inches To Cm
Convert inches to centimeters instantly. 1 inch = 2.54 cm. Fast, accurate conversion with adjustable precision. No signup, works offline.
Kg To Lbs
Convert kilograms to pounds for gym weights, luggage limits, or body weight tracking. Accurate kg-to-lb conversion. 1 kg = 2.205 lbs.
Km To Miles
Convert kilometers to miles instantly. 1 km = 0.621371 miles. Fast, accurate conversion with adjustable precision. No signup, works offline.
Kmh To Mph
Convert kilometers per hour to miles per hour instantly. 1 km/h = 0.621371 mph. Fast speed conversion. No signup, works offline.
Kml To Geojson
Convert KML files from Google Earth to GeoJSON for web mapping. Extract points, lines, and polygons. In-browser processing, your eyes only.
Lbs To Kg
Convert pounds to kilograms instantly. 1 lb = 0.453592 kg. Fast, accurate weight conversion with adjustable precision. No signup, works offline.
Liters To Gallons
Convert liters to US gallons for fuel economy, cooking recipes, or tank capacity. 1 L = 0.264 gal. Also shows UK imperial gallons.
Loot Drop Visualizer
Visualize drop rates and loot tables for games. Calculate expected drops, pity systems, weighted probabilities. Export charts. Perfect for game design.
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.
Meters to Feet Converter
Convert meters to feet instantly. 1 meter = 3.28084 feet. Fast, accurate conversion with adjustable precision. No signup, works offline.
Miles To Km
Convert miles to kilometers for marathon training, road trips, or international travel. Quick distance conversion. 1 mile = 1.609 km.
Mph To Kmh
Convert miles per hour to kilometers per hour instantly. 1 mph = 1.60934 km/h. Fast speed conversion. No signup, works offline.
Octal Decimal
Convert between octal (base 8), decimal, binary, and hexadecimal. Perfect for Unix permissions, programming, and computer science education.
Ounces To Grams
Convert ounces to grams instantly. 1 oz = 28.3495 grams. Fast, accurate weight conversion for cooking and weighing. No signup, works offline.
Percentage Calculator
Free percentage calculator. Find X% of Y, calculate percentage increase/decrease, and solve percentage problems instantly. No signup required.
Raid Calculator
Calculate usable storage and redundancy for RAID 0, 1, 5, 6, 10, 50, 60, ZFS RAID-Z, RAID-DP, JBOD. Free calculator with hot spare support.
Roman Numeral
Convert between Arabic numbers and Roman numerals. Supports numbers 1-3999. Learn the Roman numeral system with interactive conversion and rules.
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.
Shapefile To Geojson
Convert ESRI Shapefiles to GeoJSON format. Parse SHP/DBF files for web mapping. Browser-based, no uploads required.
Sqft To M2
Convert square feet to square meters instantly. 1 sq ft = 0.092903 m². Fast, accurate area conversion. No signup, works offline.
M2 To Sqft
Convert square meters to square feet instantly. 1 m² = 10.7639 sq ft. Fast, accurate area conversion. No signup, works offline.
Subnet Calculator
Calculate IP subnets from network requirements. Find optimal subnet mask, host ranges, network addresses. Essential for network planning.
Timezone Converter
Convert times between any time zones instantly. Schedule meetings across regions. Supports DST. Free, private, works offline.
Tip Calculator
Free tip calculator with bill splitting. Calculate 15%, 18%, 20% tips quickly. Split the bill evenly among friends. Perfect for restaurants.
Unix Timestamp
Convert Unix timestamps to human-readable dates and vice versa. Support for seconds and milliseconds. Shows current time, works in your browser.
Answers in Seconds
Some calculations need specialized formulas. How many SMS messages will your text use? What's the reading time for your article? How much storage does your RAID setup actually provide? These calculators handle the complexity so you don't have to.
Everyday Calculators
Age calculators compute exact age in years, months, and days from birthdate, accounting for leap years. Percentage calculators handle finding what percentage one number is of another, percentage increases, and value-after-change. Tip calculators compute gratuity and split bills among multiple people.
IT and DevOps Calculators
RAID calculators compute usable capacity for RAID 0, 1, 5, 6, and 10 configurations, accounting for parity overhead and mismatched drive sizes. Subnet calculators convert between CIDR notation and subnet masks, showing network address, broadcast, and host range. Bandwidth estimators help size internet connections and plan WAN links.
Unit Conversion
Instantly convert between length (inches↔cm, miles↔km), weight (kg↔lbs, oz↔g), temperature (°C↔°F↔K), area, volume, and more. Results update instantly as you type.