# Age calculator and days between dates

Written on 4 November 2026 by Ratio. Every example was run through Ratio that day.

Type a date of birth and Ratio gives your age. Type two dates and it counts the days between them, leap years included.

## How old

| age 14 mar 1990 | 36 years |
| --- | --- |
| 14 mar 1990 to today in years | 36.64 years |
| today - 14 mar 1990 | 13,384 days |

## Days between two dates

| 1 jan 2026 to 4 nov 2026 | 307 days |
| --- | --- |
| 1 jan 2026 to 4 nov 2026 in weeks | 43.86 weeks |
| days until 25 dec | 51 days |
| 4 nov 2026 + 90 days | Tue, 2 Feb 2027 |

For business days without weekends and holidays, see the [working days calculator](https://useratio.app/working-days-calculator).

## Which day it was

| born 14 mar 1990 | Wed, 14 Mar 1990 |
| --- | --- |
| 14 mar 1990 + 10000 days | Sun, 30 Jul 2017 |

[Try Ratio free for 7 days](https://useratio.app/download) · $14.99 once, updates included

## Questions

**How do I work out my age in days?** Type “today - 14 mar 1990” with your own date of birth. Ratio counts every day in between, leap days included.

**Does the count include the last day?** No. From 1 January to 2 January is one day, the way a calendar counts. Add 1 if you want both days counted.

**When is a 29 February birthday in other years?** The calculator above counts it on 1 March, the day after 28 February.

Source: https://useratio.app/age-calculator