Calculators - Free Online Tools
Math and unit calculators for common development and design tasks. Calculate percentages, convert between units of measurement, compute aspect ratios for images, and calculate file permissions.
All calculations happen instantly in your browser. No ads, no registration, no nonsense.
Available Tools
Percentage Calculator
Calculate percentages: what is X% of Y, X is what % of Y, and percent change from X to Y.
Unit Converter
Convert between units of length, weight, temperature, volume, and area. Common units with live conversion.
Why Use Calculators?
Certain calculations come up repeatedly in development and design work. What's 15% of this number? What's 1920x1080 scaled to a width of 800px? What chmod value gives these permissions? What's 10 inches in centimeters?
These tools handle the math instantly. No need to break out a calculator or write code for one-off calculations. Just input the values and get immediate results.
They're also useful for verification. Did you calculate that percentage correctly? Does this aspect ratio maintain the proportions you want? These tools give you confidence your math is right.
Common Use Cases
- • Calculating discounts and markup percentages for pricing
- • Converting measurements between metric and imperial units
- • Maintaining aspect ratios when resizing images or designing layouts
- • Setting correct file permissions on servers with chmod values
- • Computing percentage changes for reports and analytics
- • Converting temperatures for internationalization
- • Calculating responsive image dimensions for different screen sizes
- • Verifying manual calculations before implementing in code
- • Converting units for API parameters or database values
Related Categories: Date & Time | Converters | Color & Design