Time Duration Calculator

Calculate the duration between two times in hours, minutes, and seconds. Supports overnight spans. 100% browser-based. Free, private, in-browser.

Related free tools

Tip Calculator — Calculate tip amounts and split bills among any number of people.
Unit Converter — Convert length, weight, temperature, volume, area, speed, and data units.
Hex to Decimal Converter — Convert between hexadecimal, decimal, binary, and octal.
Binary to Decimal Converter — Convert binary numbers to decimal, hex, and octal instantly.
Date Difference Calculator — Calculate days, weeks, months, and years between any two dates.
Aspect Ratio Calculator — Calculate and scale aspect ratios with common presets.
Number to Words — Convert numbers to their English word representation.
Roman Numeral Converter — Convert between Roman numerals and decimal numbers.
Scientific Calculator — Trig, logs, exponents, parentheses, π and e — evaluated safely in your browser. No eval, with history.
GPA Calculator — Calculate cumulative GPA on the 4.0 scale. Add courses, credits, and grades with real-time updates.
Sales Tax & VAT Calculator — Add or remove sales tax, VAT, GST, or HST from any amount. Works for US, UK, EU, AU, IN, CA.
Invoice Maker — Free professional invoice generator — multi-currency, VAT/GST, discount, instant PDF download. No sign-up, no watermark.