Half Your Age Plus 7 Rule Calculator

Enter an age to calculate the socially acceptable dating range using the classic half-plus-seven rule.

22Minimum age you can date: 22
46Maximum you can be dated by: 46
Formula: (30 ÷ 2) + 7 = 22Reverse: (30 − 7) × 2 = 46
100% client-side calculation · zero data transmission

Half Your Age Plus 7 Reference Chart (Ages 18–80)

Complete reference table showing the socially acceptable age range for every age from 18 to 80 using the half your age plus seven rule.

Your AgeMin AcceptableMax Acceptable
181622
191724
201726
211828
221830
231932
241934
252036
262038
272140
282142
292244
302246
312348
322350
332452
342454
352556
362558
372660
382662
392764
402766
412868
422870
432972
442974
453076
463078
473180
483182
493284
503286
513388
523390
533492
543494
553596
563598
5736100
5836102
5937104
6037106
6138108
6238110
6339112
6439114
6540116
6640118
6741120
6841122
6942124
7042126
7143128
7243130
7344132
7444134
7545136
7645138
7746140
7846142
7947144
8047146

The half your age plus 7 rule should be used with caution for ages 18–20 as it produces results below the age of majority in many jurisdictions.

How the Half Your Age Plus 7 Rule Works

The half your age plus seven rule is a simple formula dating back over a century. It provides a quick way to gauge whether an age gap in a relationship falls within a commonly accepted social boundary. Below is a complete breakdown of the math behind the rule.

The Formulas

Minimum Acceptable Age = (Your Age ÷ 2) + 7
Maximum Age You Can Be Dated By = (Your Age − 7) × 2

Worked Examples

A 25-year-old: Minimum = 25: (25 ÷ 2) + 7 = 12.5 + 7 = 19.5 → rounds to 20. Maximum = (25 − 7) × 2 = 18 × 2 = 36. So a 25-year-old's socially acceptable dating range is roughly ages 20 to 36.
A 35-year-old: Minimum = 35: (35 ÷ 2) + 7 = 17.5 + 7 = 24.5 → rounds to 25. Maximum = (35 − 7) × 2 = 28 × 2 = 56. So a 35-year-old's range spans approximately 25 to 56.
A 50-year-old: Minimum = 50: (50 ÷ 2) + 7 = 25 + 7 = 32. Maximum = (50 − 7) × 2 = 43 × 2 = 86. At 50, the rule suggests a dating range of 32 to 86.

Note: The minimum formula result is generally rounded up to the next whole year. Under the rule, if you are the younger partner, you should not date anyone older than the maximum age given by the reverse formula. The two formulas are perfect mathematical inverses of each other.

Reverse Calculation — Who Can Date You?

The half your age plus seven rule works in both directions. If you know what age you'd like to date, you can work backwards to find out how old that person would need to be for the relationship to comply with the rule.

If your preferred minimum partner age is M, then the oldest person who can date you is: (M − 7) × 2

Example: If the youngest person you're comfortable dating is 25, then someone up to (25 − 7) × 2 = 36 years old could date you under this rule. In other words, a 36-year-old is the oldest person who could have a 25-year-old as their minimum acceptable partner age.

Two-Way Perspective

If you are the OLDER partner:
Your minimum acceptable partner age is (Your Age ÷ 2) + 7
If you are the YOUNGER partner:
The oldest person who can date you is (Your Age − 7) × 2

Where Does the Rule Come From?

The half your age plus seven rule has a surprisingly rich cultural history spanning over 120 years. While often treated as a modern dating guideline, its roots trace back to late 19th-century European literature and early 20th-century pop culture.

  • 1901
    French author Max O'Rell first proposed the formula in his book "Her Royal Highness Woman," suggesting that a man's ideal wife should be half his age plus seven years.
  • 1931
    French entertainer Maurice Chevalier referenced the rule in an interview, bringing it into broader pop culture conversation.
  • 1951
    The play "The Moon Is Blue" popularized the concept in American culture, featuring dialogue that explicitly stated the half-plus-seven formula.
  • 2007
    The webcomic xkcd dubbed it the "Standard Creepiness Rule" in a now-famous comic strip, cementing the rule's place in internet culture with a tongue-in-cheek name that is still used today.
  • Modern Day
    The rule has been referenced in TV shows including How I Met Your Mother, Parks and Recreation, and The Office, making it a widely recognized piece of pop-culture dating lore.

It's important to remember that this is a folk rule, not a scientific law. It was never designed as a formal ethical guideline — it's a social convention that gained traction through humor, literature, and word of mouth over more than a century.

Age Difference in Relationships — What Research Says

While the half your age plus seven rule is cultural folklore, academic research provides real data on age preferences and relationship satisfaction.

Buunk et al. (2000) — Age Preferences Study

A landmark study published in the Journal of Social and Personal Relationships examined age preferences across different life stages. Key findings include:

Men's minimum age preferences roughly aligned with the half-plus-seven rule.
Women's minimum age preferences were stricter than the rule would predict — most women preferred partners closer to their own age.
Both men and women preferred narrower age gaps for maximum age preferences than what the rule's reverse formula would allow.

Psychology Today (2014)

A Psychology Today analysis noted that while age-gap relationships face more social scrutiny, relationship satisfaction depends far more on shared values, communication, and emotional maturity than on chronological age proximity.

Real-World Data

In the United States, the average age gap between married couples is approximately 2.3 years (with the husband typically older), far narrower than what the half-plus-seven rule would permit at most ages.

Frequently Asked Questions

The half your age plus 7 rule is a social guideline for determining whether an age gap in a romantic relationship is socially acceptable. The formula states that the youngest person you should date is half your age plus seven years. For example, a 30-year-old should not date anyone younger than 22 (30 ÷ 2 + 7 = 22). This rule has been referenced in popular culture for over a century and is often used as a quick, humorous reference point for discussing age-gap relationships.

According to the half your age plus seven rule, the youngest person a 30-year-old should date is 22. The calculation is: (30 ÷ 2) + 7 = 15 + 7 = 22. Going in the reverse direction, a 22-year-old could date someone as old as (22 − 7) × 2 = 30, so the rule is reciprocal in this case.

To find the maximum age someone can be dated by, use the reverse formula: (Your Age − 7) × 2. For example, if you are 28: (28 − 7) × 2 = 21 × 2 = 42. This means a 28-year-old could date someone as old as 42 under the rule. The two formulas — (Age ÷ 2) + 7 for minimum and (Age − 7) × 2 for maximum — are mathematical inverses of each other.

Yes, the rule is fully reciprocal. If Person A can date Person B under the rule, then Person B can also date Person A. This is because the formulas are mathematical inverses: if B ≥ (A ÷ 2) + 7, then A ≤ (B − 7) × 2. You can verify this with any age pair using our calculator above.

The earliest known reference to the formula appears in Max O'Rell's 1901 book "Her Royal Highness Woman," where it was presented as the ideal age for a man's wife. It gained wider recognition through Maurice Chevalier (1931), the play "The Moon Is Blue" (1951), and the xkcd webcomic's "Standard Creepiness Rule" (2007). For a detailed cultural history, see our "Where Does the Rule Come From?" section above.

No. The half your age plus seven rule is a folk guideline, not a scientifically validated standard. Research by Buunk et al. (2000) found that while men's minimum age preferences roughly align with the rule, women prefer partners closer to their own age, and both genders prefer narrower age gaps than the rule would predict. Relationship success depends on compatibility, communication, and shared values — not on satisfying an arbitrary mathematical formula.

The inverse formula answers: "Given my age, what is the oldest person who could date me?" The calculation is (Your Age − 7) × 2. For a 25-year-old: (25 − 7) × 2 = 36. This means someone as old as 36 could date a 25-year-old under the rule. To verify: check with the forward formula — (36 ÷ 2) + 7 = 25. The two formulas are perfect mathematical inverses.

The rule was originally framed in a heterosexual context (specifically, a man's ideal wife's age), but it's simply a mathematical formula — it applies regardless of gender or sexual orientation. Many people now use it as a general-purpose social benchmark for age gaps in any romantic or dating context. However, same-sex couples show different age-gap patterns in real-world data, with larger gaps being more common in some same-sex communities.

The rule becomes increasingly permissive at older ages. For example, an 80-year-old's minimum dating age under the rule would be 47 — a 33-year gap. By age 100, the minimum would be 57. The rule also produces unreasonable results at very young ages: for someone aged 14–17, the rule yields minimums below the age of majority (which is why this calculator starts at 18). Most people consider the rule a rough guideline that loses practical meaning for age gaps exceeding 20–25 years.

The 'Standard Creepiness Rule' is the tongue-in-cheek name given to the half your age plus seven formula by the popular webcomic xkcd in a 2007 comic strip. The comic humorously presented the rule as a mathematical standard for determining whether a relationship's age gap is "creepy." The name has since become an internet meme and is often used as a playful synonym for the half-plus-seven rule in online discussions about age-gap dating.

This tool is for entertainment and informational purposes only. It is not a scientific standard, legal advice, or a substitute for personal judgment in relationships.
Last updated: July 2026