# CalculatorSpan

> Free online calculators for time, date, and work hours. All tools run
> in the browser - no sign-up, no ads blocking results, instant answers.

## Tools

- [Time Calculator](https://calculatorspan.com/time-calculator/): Add and subtract hours, minutes, and seconds - handles base-60 conversion automatically
- [Hours Ago Calculator](https://calculatorspan.com/hours-ago-calculator/): Find the exact time and date a set number of hours in the past
- [Hours From Now Calculator](https://calculatorspan.com/hours-from-now-calculator/): Find the exact future time and date from any number of hours or minutes ahead
- [Hours to Decimal Calculator](https://calculatorspan.com/hours-minutes-to-decimal-calculator/): Convert HH:MM time into decimal format for payroll and timesheets
- [Timecard Calculator](https://calculatorspan.com/timecard-calculator/): Track daily shifts, deduct breaks, and total weekly work hours for payroll
- [Date Difference Calculator](https://calculatorspan.com/date-difference-calculator/): Find the exact number of days, weeks, or months between two calendar dates
- [Lead Time Calculator](https://calculatorspan.com/lead-time-calculator/): Calculate order-to-delivery lead time across procurement, production, and shipping
- [Age Calculator](https://calculatorspan.com/age-calculator/): Find exact age in years, months, and days from a date of birth
- [How Long Until 12:00 AM](https://calculatorspan.com/how-long-until-1200-am/): Live countdown to midnight or any custom target time

## About

CalculatorSpan is a free tool suite for time, date, and supply chain calculations. Every calculator runs client-side in the browser. No accounts, no stored data, no ads interrupting results.