Relationship Calculators: Free Dating and Duration Tools

Free Relationship Calculators

Browse free online calculators and quizzes for couples in one place, then open the tool that suits your situation.

Some tools count the time you have been together, one compares the ages of two spouses, and others are about a crush or how things are going between you and your partner. Each page is separate, so this hub helps you decide where to start.

Dating and Relationship Duration Calculators

Two tools that show the duration of your time together, counted from the day it started.

Dating Calculator: How Long Have We Been Together

Best for a quick look at your time together, with your next anniversary included.

Use Calculator

How Long Have We Been Together Calculator

Best when one number is not enough. It adds a running counter, monthly dates and milestones to look forward to.

Use Calculator

Age Gap, Crush and Relationship Tools

Tools for comparing ages, trying a name-based score and reflecting on how things are going between you.

Married Couple Age Gap Calculator

Best for spouses who want to enter each birthdate and see the age difference, with an optional wedding date.

Use Calculator

Crush Calculator

Best for trying a name-based compatibility test with your crush. The result is a percentage score.

Use Calculator

Romantic Relationship Problem Calculator

Best when you want to reflect rather than count. A guided self-assessment quiz that points to areas of your partnership worth a closer look. It is not professional advice.

Take the Quiz

Which Calculator Fits Your Situation?

Match your situation to a tool.

Your situation	Where to go
You want to see how far along you are as a couple	Dating Calculator
You want a running counter and dates to look forward to	How Long Have We Been Together Calculator
You are curious about the gap between two birthdays	Married Couple Age Gap Calculator
You want a quick name-based score for you and your crush	Crush Calculator
You want to reflect on how things are going between you	Romantic Relationship Problem Calculator

Frequently Asked Questions

What are relationship calculators?

They are online tools that turn a few details, such as dates or names, into a result about a couple. This page lists the ones available on UnderstandShe so you can compare them before opening one.

Are these tools free?

The tools are described as free on their own pages. Open a tool to see its current details.

Is the quiz the same as a calculator?

No. The problem tool is a quiz. You answer questions instead of entering dates or names, and the result points to areas to think about rather than giving a calculation.

Can these tools replace professional advice?

No. They are meant to inform and to start a conversation. For serious concerns, speak with a qualified professional or a local support service.

Which tool is closest to a love calculator?

The Crush Calculator. Like most love meters, it turns two names into a percentage score. A high or low percent says little about how someone feels, so treat it as a talking point, not a prediction. It uses names only, with no zodiac signs involved.

Can the age gap tool tell me what is acceptable?

No. The age gap tool only shows the difference between one birthday and the other. Whether that gap feels acceptable in a marriage is a personal decision for the couple.

Do I need to download an app?

No. These tools run in your web browser, so there is nothing to install.

What do I need to enter in these tools?

It depends on the tool. The date tools ask for a start date, the age gap tool asks for a date of birth for each partner, the crush tool asks for two names, and the quiz asks you to answer questions.

Can I use the date tools to plan an anniversary?

Yes. Both date tools show upcoming anniversary or milestone dates, which can help you plan something special.