Find your half birthday — exactly six months from your date of birth. Half Birthday Calculator is a free online tool from the ToolsRift Everyday Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Your half birthday is the day exactly six months after your birthday. People with birthdays near holidays sometimes celebrate their half birthday instead.
The tool adds six calendar months to your birth date. For example, a January 15 birthday gives a July 15 half birthday.
Adding six months lands in late February, which has fewer days, so the resulting date rolls to early March — the tool shows the exact resolved date.