# CalculateHours.net

> Free, privacy-first online calculators for time, hours, pay, dates, age, time zones, and sleep. Every tool runs entirely in the user's browser — no sign-up and nothing entered is stored — and each result can be exported to a clickable PDF. US figures use current 2026 IRS tax brackets, FICA rates, and FLSA labor rules, with international notes where relevant.

CalculateHours.net is a collection of 15 calculators plus reference material: a 200-term glossary, 27 step-by-step how-to guides, and a 74-question FAQ. Answers are self-contained and cite official sources (US Department of Labor, IRS, SSA, OPM, ISO, NIST, NHLBI).

## Calculators

- [Hours Calculator](https://calculatehours.net/calculators/hours-calculator.html): Free hours calculator with overtime and pay. Track weekly work hours, breaks, overnight shifts. Decimal hours converter. Print & CSV export. No sign-up.
- [Paycheck Calculator](https://calculatehours.net/calculators/paycheck-calculator.html): Free 2026 paycheck calculator. Estimate your take-home pay after federal tax, Social Security, Medicare, state tax, and 401(k) — by paycheck and per year. Exact 2026 brackets.
- [Salary Calculator](https://calculatehours.net/calculators/salary-calculator.html): Free salary calculator. Convert between hourly wage and annual, monthly, weekly, and daily salary. Includes overtime, paid time off, and 50-week assumptions.
- [Overtime Pay Calculator](https://calculatehours.net/calculators/overtime-calculator.html): Free overtime pay calculator. Calculate 1.5× and 2× overtime under FLSA federal law and state rules (CA, NY, AK, NV). Handles daily and weekly overtime.
- [PTO & Vacation Accrual Calculator](https://calculatehours.net/calculators/pto-calculator.html): Free PTO accrual calculator. Turn annual vacation days into per-paycheck and per-hour-worked accrual, track your available balance, and project year-end PTO with carryover caps.
- [Time Card Calculator](https://calculatehours.net/calculators/time-card.html): Free time card calculator with multiple punch-in/punch-out entries per day. For split shifts, multiple breaks, and complex daily schedules.
- [Time Adder](https://calculatehours.net/calculators/time-adder.html): Free time adder calculator. Sum multiple time durations in HH:MM or HH:MM:SS format. Up to 20 entries. Print and email results. No sign-up.
- [Time Between Two Dates](https://calculatehours.net/calculators/time-between-dates.html): Calculate the exact time between any two dates. Get the result in days, weeks, months, years, hours, or minutes. Includes optional end-date counting.
- [Date Calculator](https://calculatehours.net/calculators/date-add-subtract.html): Free date calculator. Add or subtract days, weeks, months, or years from any date. Supports business days (excluding weekends).
- [Working Days Calculator](https://calculatehours.net/calculators/working-days.html): Free working days calculator. Count business days between dates, excluding weekends and US federal holidays. For project planning, deadlines, and HR.
- [Age Calculator](https://calculatehours.net/calculators/age-calculator.html): Free age calculator. Calculate exact age in years, months, days, hours, minutes, and seconds from any birthdate.
- [Day of the Week Calculator](https://calculatehours.net/calculators/day-of-week.html): Free day of the week calculator. Find out what day of the week any past or future date falls on. Includes zodiac, week number, and day of year.
- [Countdown Timer](https://calculatehours.net/calculators/countdown-calculator.html): Free live countdown calculator. See exactly how many days, hours, minutes, and seconds until Christmas, New Year, a birthday, a deadline, or any date. Business-day count included.
- [Time Zone Converter](https://calculatehours.net/calculators/time-zone-converter.html): Free time zone converter. Convert any time across IST, PST, EST, GMT, JST, AEST, CET and 50+ world zones at once. Handles Daylight Saving automatically.
- [Sleep Calculator: Best Wake-Up Times by Sleep Cycle](https://calculatehours.net/calculators/sleep-calculator.html): Free sleep calculator. Find the best times to wake up or go to bed based on 90-minute sleep cycles. Wake refreshed, not groggy.

## Guides & reference

- [How-To Guides](https://calculatehours.net/howto.html): 27 step-by-step guides, each with a formula, worked example, and the matching calculator.
- [Glossary](https://calculatehours.net/glossary.html): 200 defined terms across time, pay, overtime, dates, age, time zones, sleep, and payroll compliance.
- [FAQ](https://calculatehours.net/faq.html): 74 answered questions with links to the relevant tool.
- [Blog](https://calculatehours.net/blog/index.html): 29 articles on hours, overtime, pay conversions, and payroll rules.
- [Free Tools](https://calculatehours.net/freetools.html): directory of related calculators.

## About

- [About](https://calculatehours.net/about.html)
- [Contact](https://calculatehours.net/contact.html)

## Optional

- [Full site text (llms-full.txt)](https://calculatehours.net/llms-full.txt): every calculator description, all 27 guides with formulas, the full glossary, and the full FAQ in one document.