---
title: "Hours Calculator — Add, Subtract Hours and Minutes, Convert Decimal"
description: "Add or subtract multiple time values in hours and minutes. Convert between decimal hours and H:MM format. Essential for timesheets, billing, and scheduling."
url: "https://worldcalculators.org/calculators/hours-calculator/"
canonical: "https://worldcalculators.org/calculators/hours-calculator/"
---

# Hours Calculator

Add or subtract multiple time values in hours and minutes. Convert between decimal hours and H:MM format. Essential for timesheets, billing, and scheduling.

## Quick answer

2 hours 30 minutes + 1 hour 45 minutes = 4 hours 15 minutes (4.25 decimal hours). Use the calculator below to add multiple time values or convert formats.

## Frequently Asked Questions

Law firms and consultants typically bill in 6-minute increments (0.1 hour). This means 7 minutes is billed as 0.2 hours (12 minutes), 13 minutes as 0.3 hours, and so on. The 6-minute increment divides an hour into exactly 10 billable units, simplifying calculations.
This calculator supports totals beyond 24 hours — useful for multi-day project tracking or timesheets. The result shows total hours (e.g. 31h 15m) rather than rolling over to a new day. For time-of-day calculations, use the Time Calculator instead.

Source: https://worldcalculators.org/calculators/hours-calculator/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.