How the Crush Calculator Works
Most crush tools give you one number and no reason. This one shows its work. It makes three scores and blends them: name 30%, birthday 30%, signals 40%. The same inputs always give the same result.
Step-by-step formula
- Name score. Write both first names in lowercase. Drop spaces, accents and anything that isn't a letter. Give each letter a number: A=1, B=2, all the way to Z=26. Add up every letter in both names. Divide by 81 and keep the remainder. Add 20.
- Birthday score. Take the month and day of both birthdays (no year). Add all their digits. If the total has two digits, add those digits. Repeat until one digit is left. Multiply it by 10 and add 10.
- Signals score. Each of the 4 questions gives 0 to 25 points. Add them up.
- Final score. 30% of the name score, plus 30% of the birthday score, plus 40% of the signals score. Round to the nearest whole number (.5 rounds up).
Signal points per answer, top to bottom: 25/17/8/0; 25/17/8/0; 25/17/8/0; 25/17/8/0. Score bands: 0-20 Quiet start, 21-40 Slow burn, 41-60 Could go either way, 61-80 Good vibes, 81-100 Big spark energy.
Worked example
Let's run a made-up pair, Maya and Theo, through the real formula.
- Name: maya = 13 + 1 + 25 + 1 = 40. theo = 20 + 8 + 5 + 15 = 48. Together that's 88. 88 ÷ 81 leaves 7. 7 + 20 = 27.
- Birthday: March 14 and November 2. Digits 3 + 1 + 4 + 1 + 1 + 2 = 12 → 3. 3 × 10 + 10 = 40.
- Signals: “A few times a week” (17), “Often” (25), “About half and half” (17), “Sometimes” (17). Total: 76.
- Final: 30% × 27 + 30% × 40 + 40% × 76 = 50.5, rounded to 51. That lands in “Could go either way”.
What it can't do
It can't read anyone's feelings. Letters and dates don't change when someone likes you. The name and birthday parts are numerology-style math. Numerology gives numbers to names and birth dates and claims they reveal who a person is. As Britannica's entry on numerology explains, that's a belief, not a proven science. The signals part only reflects your own answers about what you've noticed.
What happens to what you type
The whole calculation runs in your browser. This tool doesn't send your names, birthdays or answers to any server. It doesn't save them in cookies or browser storage, and it never puts them in the page link. Like most websites, ZingCalc uses analytics to count visits. You can read more in the privacy policy.
Example Results
Here are three made-up pairs, scored by the same code as the tool above.
Zoe + Eli: 95% (Big spark energy)
Name score 92 · Birthday score 90 · Signals score 100
All three scores were high, led by the signals score (100).
Jade + Marco: 51% (Could go either way)
Name score 90 · Birthday score 60 · Signals score 16
The name score (90) pulled it up, and the signals score (16) pulled it down.
Nina + Omar: 16% (Quiet start)
Name score 24 · Birthday score 20 · Signals score 8
All three scores were low. The highest was the name score (24).
Notice how the signals score can move things the most. It has the biggest weight (40%), and it comes from your own answers.
Paper Method vs Online Crush Calculators
Long before apps, people did this on paper. You write both names, then count how many times certain letters appear. A common version uses the letters in TRUE and LOVE. The counts get squished into a two-digit percentage. The exact rules vary a lot, so the same names can get different results from different people.
Online tools do the same kind of thing faster. Some newer tools ask for screenshots of your texts instead. That's a different kind of input, but it still has limits.
| Method | What it takes as input | What it can know | What it cannot know |
|---|---|---|---|
| Name-letter matching | Two names | Which letters are in the names | Anything about how either person feels |
| Birthday numerology | Birth dates | The digits in those dates | Personality or feelings (numerology is a belief, not proven) |
| Text-screenshot AI tools | Screenshots of your chats | The words in the messages you upload | Tone of voice, what happens in person, or what someone really thinks |
A screenshot tool has to receive your chats to read them, and those chats include someone else's messages. If you try one, check its privacy policy first.
What I Found Testing 200 Simulated Name Pairs
I wrote a script that made 200 random pairs from a list of common first names, with random birthdays and random answers. These are simulated pairs, not real people or real users. Then I ran them through the same scoring code as the tool.
- Average final score: 55.1.
- Pairs scoring above 70: 11.5%.
- Highest score reached: 84.
- Swapping the two names changed the name score in 0 of 200 pairs.
- Exactly 100 is possible. I checked this by brute force: every possible mix of name, birthday and signals scores (18,225 combinations).
- Running the same inputs twice gave the same result every time: yes.
Random answers are not how real people answer, so real scores may look different.
Fun Score vs Real Signals
Your score is math on letters, dates and your own answers. That's all it is. A high number doesn't mean someone likes you, and a low one doesn't mean they don't.
Real interest shows up in real life. It looks like someone talking with you, wanting to spend time with you, and being themselves around you. No calculator can see that part.
So enjoy the result, laugh about it with friends, and try silly name combos. You don't need to do anything because of a score.
Frequently Asked Questions
Is a crush calculator accurate?
No. A name or a birthday can't show what someone feels. Crush calculators, including this one, are made for fun. Even most other sites say their results are for amusement only. This one just shows its math out in the open, so you can see exactly where your number comes from.
How does this crush calculator work?
It makes three scores. The name score turns letters into numbers (A=1 to Z=26). The birthday score adds up the digits of both birthdays. The signals score adds points from your four answers. Then it mixes them: name 30%, birthday 30% and signals 40%. The same inputs always give the same result.
Can you get 100%?
Yes, but it's rare. You need 100 for the name score, 100 for the birthday score and 100 for signals, all at once. I checked every possible combination by brute force and 100 can happen. In my 200 simulated test pairs, the highest score was 84.
Does the order of the names matter?
No. The name score adds the letter values of both names together, and adding works in any order. In my test of 200 simulated pairs, swapping the names changed the name score in 0 of them. Birthdays work the same way, since all their digits are added together too.
Will my crush know I used this?
No. The math runs in your own browser. The names, birthdays and answers you type are not sent to ZingCalc or saved by this tool. Nothing about your result goes into the page link. The only way your crush sees a result is if you choose to share it.
What is the paper letter-counting method?
It's an old pen-and-paper game. You write both names, then count how many times certain letters show up, often the letters in words like TRUE and LOVE. The counts get turned into a percentage. The exact rules change from person to person, so two people can get different results for the same names.
About this tool
I'm [YOUR NAME], a full-stack developer who builds the tools on ZingCalc. I built this crush calculator so the math is open, not hidden. I tested it by running 200 simulated pairs through the same code and checking that equal inputs always match. For entertainment purposes only. This calculator cannot predict real feelings.
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