Free Online Calculators for Developers and Designers
Practical calculators for everyday development, networking, and design work. Enter your values and get the result instantly.
21 tools in this section
Calculate Percentages Online
Calculate percentages, percentage change, and percentage of a number. Free online percentage calculator with multiple modes.
Calculate Your Exact Age Online
Calculate your exact age in years, months, days, hours, and minutes from your birthdate. Free online age calculator.
Calculate chmod Permissions Online
Convert between chmod numeric and symbolic permission modes. Free online chmod calculator for Linux file permissions.
Calculate IP Subnets Online
Calculate subnet masks, network ranges, and usable hosts from CIDR notation. Free online subnet calculator.
Calculate Aspect Ratios Online
Calculate equivalent dimensions while maintaining aspect ratio. Free online aspect ratio calculator for images and video.
Bitwise Calculator Online - AND, OR, XOR, NOT
Perform bitwise operations (AND, OR, XOR, NOT, shift) on numbers. Free online bitwise calculator with binary display.
Scientific Calculator Online
Full-featured scientific calculator with trigonometry, logarithms, and advanced math. Free online scientific calculator.
Statistics Calculator Online - Mean, Median, Standard Deviation
Calculate mean, median, mode, standard deviation, and variance from a data set. Free online statistics calculator.
CSS Specificity Calculator Online
Calculate the specificity score of any CSS selector. Free online CSS specificity calculator with visual breakdown.
Calculate 16:9 Aspect Ratio Dimensions Online
Work out 16:9 width and height pairs and resize without distortion. Free 16:9 aspect ratio calculator with presets for video and screens, no signup.
Calculate Percent Off a Price Online
Work out a discount and final price from a percent off. Free percent off calculator for sales and coupons, no signup.
Calculate a Tip Amount Online
Figure a tip and total from any percentage. Free tip calculator for restaurant bills and services, no signup.
Calculate Age in Days Online
Find your exact age in days from your date of birth. Free age in days calculator that also shows weeks and hours, no signup.
Calculate a chmod Permission Online
Build Unix file permissions and the chmod command visually. Free chmod calculator with octal and rwx output, no signup.
Calculate CIDR to Subnet Mask Online
Convert a CIDR prefix to a dotted-decimal subnet mask and wildcard mask. Free online CIDR to subnet mask calculator.
Calculate Usable Hosts Per Subnet Online
Find how many usable hosts a /24, /26, or any prefix holds. Free online subnet host count calculator with usable range.
Calculate Which CSS Selector Wins
Compare two CSS selectors and see which one wins by specificity. Free online CSS specificity calculator with a bar chart, no signup.
Standard Deviation Calculator Online
Calculate sample and population standard deviation, variance, and mean from your data. Free online calculator with step-by-step working and charts.
Mean, Median, and Mode Calculator
Calculate the mean, median, mode, and range of a data set online for free. Includes quartiles, charts, and step-by-step working in your browser.
Scientific Calculator Online Free
A free scientific calculator with sin, cos, tan, log, factorial, and full expression input. Switch between degrees and radians, no download required.
Bitwise XOR Calculator Online
Calculate the bitwise XOR, AND, OR, NOT, and shifts of two numbers in decimal, hex, or binary. Results in all bases with a visual bit grid. Free tool.
Full Tool Pages
About These Tools
Every tool in this section is free and runs entirely in your browser on ToolBox. There are no uploads, no accounts, and no usage limits, so your files and data stay on your own device. Browse the full tool directory for everything else.