Relationship Calculator
Enter a date in the past.
Ticks live, down to the second. Reaching 1–10 years automatically pops a celebration when you set the date — the fireworks get bigger the longer you've been together.
Free relationship calculator that shows exactly how long you've been together — down to the second, live-updating — with an automatic fireworks celebration for 1st through 10th anniversaries.
How it works
- Enter the date (and optionally the time) you first got together
- See a live-updating count of years, months, days, hours, minutes, and seconds together
- Hit a 1-through-10-year anniversary and a fireworks celebration pops up automatically — bigger fireworks for bigger anniversaries
- Download a certificate image of your time together, stamped "OllTools Certified", to save or share
Frequently asked questions
Does it update in real time?
Yes — the total days, hours, minutes, and seconds tick up live every second, like a running counter, not just a static calculation.
When does the fireworks celebration show up?
Automatically the moment your calculated time together crosses a 1-through-10-year anniversary. You can also replay it anytime with the "Show anniversary celebration" button. Anniversaries beyond 10 years still show the biggest (10th-anniversary) fireworks.
What's the certificate?
Click "Download certificate" to generate a shareable image — your time-together total, the date you met, and a playful "OllTools Certified" stamp — as a PNG you can save, print, or send. You can optionally add your names or nicknames, and the preview updates live as you type.
Is my data saved or sent anywhere?
No — everything runs in your browser. Nothing you enter is saved to a server or shared anywhere unless you use the share buttons yourself.
Related tools
From the blog
Update history
- 2026-09-01 Added: a sample certificate image on the tool page, so you can see what the download looks like before generating your own.
- 2026-09-01 Added: optional name/nickname fields on the certificate — enter both partners' names and they appear on the downloaded image, updating live as you type.
- 2026-09-01 Added: a downloadable "certificate of time together" image — your duration, the date you met, and an OllTools stamp — generated entirely client-side as a PNG.
- 2026-09-01 Launched: relationship calculator with a live-ticking time-together counter and an automatic tiered fireworks celebration for 1st-10th anniversaries. Entirely client-side, no signup.