Percentage Calculator
Calculate percentages, percent change, and proportion values fast.
Open ToolCalculators & Converters — Free Online Utility Calculators
Calculate percentages, age, and unit conversions quickly with no signup required.
Featured Calculators
Age Calculator
Get exact age from date of birth with years, months, and days.
Open ToolUnit Converter
Convert length, weight, temperature, and speed units in one place.
Open ToolRandom Number Generator
Generate random numbers within a custom range using secure browser randomness.
Open ToolCurrency Converter
Convert between world currencies using live exchange rates.
Open ToolAll Calculators & Converters
Percentage Calculator
Run percent of total and growth/decline calculations.
Open ToolAge Calculator
Calculate age from dates with exact calendar breakdown.
Open ToolUnit Converter
Switch between metric and imperial units quickly.
Open ToolRandom Number Generator
Generate random numbers within a custom range using secure browser randomness.
Open ToolCurrency Converter
Convert between world currencies using live exchange rates.
Open ToolCommon calculator use cases
Business
- Compute percentage growth metrics
- Estimate lending and repayment values
- Prepare quick financial comparisons
Everyday Utility
- Split bills and calculate tip values
- Convert units while shopping or traveling
- Calculate date and age differences
Operations
- Convert measurements during planning
- Standardize unit systems across teams
- Reduce spreadsheet dependency for quick math
Education
- Support math and conversion exercises
- Validate assignment calculations
- Speed up everyday classroom checks
Online calculators that prioritize speed and clarity
ToolCrux calculators are designed for high-frequency, low-friction use. Whether users need percentage calculations for reports, unit conversions during operations, or time-based calculations for planning, this category aims to make common math tasks immediate and accessible.
As this section expands, ToolCrux will cover both broad utility calculators and long-tail conversion needs. The objective is to provide trustworthy, quick, and mobile-friendly outputs for everyday calculations.
Related Categories
FAQ
How do I calculate a percentage of a number?
Enter the percentage and the number — for example, "15% of 200" gives you 30. The Percentage Calculator also handles reverse calculations: "30 is what percent of 200?" and percentage change between two values.
How accurate is the Age Calculator?
It calculates your exact age in years, months, and days, accounting for varying month lengths and leap years. It also shows total days lived from your date of birth to the target date.
What units does the Unit Converter support?
It covers length (meters, feet, inches, miles), weight (kg, lbs, ounces), temperature (Celsius, Fahrenheit, Kelvin), speed, area, volume, and data storage units. Results update instantly as you type.
Can I convert between metric and imperial units?
Yes. The Unit Converter handles all common metric-to-imperial and imperial-to-metric conversions. Select your category, choose the source and target units, and type a value.
Do these calculators work offline?
All calculations run in your browser with no server calls, so they work as long as the page is loaded. They do not currently support offline/PWA mode, but all math is performed locally.