Bottle & Can Counter
Last updated: February 2026
Whether you've got one bag or a truckload, counting bottles and cans before returning them matters. If you don't know your count, you can't verify the redemption center's payout. Here are the 5 most common counting methods, ranked from slowest to fastest.
| Method | Speed | Accuracy | Best For |
|---|---|---|---|
| Hand counting | Slow | 100% | Small batches (<50) |
| Tally counter (clicker) | Medium | 99% | Medium batches |
| Bag estimation | Fast | ±30% | Rough guesses only |
| Weighing | Fast | ±15% | All-aluminum loads |
| Phone camera (CNTEM'UP) | Fastest | 95%+ | Any quantity |
Pick up each container, move it to a "counted" pile, keep a mental tally. Simple but painfully slow for anything over 50 containers. You'll lose count, start over, and waste time you could spend actually earning money.
Best for: Small batches under 50 containers. Not practical for serious collectors.
Buy a cheap mechanical tally counter ($3-5) and click once per container as you sort. Faster than mental counting because you don't lose your place. Still requires you to handle each container individually.
Best for: People who sort into bags regularly and want a reliable count per bag.
A standard 13-gallon kitchen bag holds roughly 75-100 cans. A large 55-gallon bag holds 300-400. Multiply bags × estimate and you've got a rough total. (Don't crush cans — most machines reject them.)
The problem: Accuracy varies wildly — mixed containers (bottles vs. cans, different sizes) make estimates off by 30% or more. You could be leaving $5-20 on the table per load.
An empty aluminum can weighs about 14.9 grams (0.5 oz). Weigh your bag, divide by 14.9g, and you've got your aluminum can count. A bathroom scale works for large bags — weigh yourself holding the bag, then without it.
The problem: Only works for all-aluminum loads. Plastic bottles (25-35g) and glass (200-400g) throw off the math completely. And some redemption centers won't accept weight-based counts for per-container deposits.
Prop your phone up, open CNTEM'UP, and slide containers past the camera. A tripwire line on screen detects each container as it crosses — no touching the phone, no clicking, no math. Works with cans, bottles, plastic, glass, any size.
Go to cntemup.com on your phone. Tap "Start Counting" to open the camera.
Lean it against a wall, box, or bag so the camera faces your sorting area. The green tripwire line should be visible across the screen.
Move each bottle or can past the tripwire. Every time something crosses the line, the counter ticks up. Go as fast as you want.
When you're done, the screen shows your count and estimated deposit value based on your state's rate. Screenshot it and take it to the redemption center.
No download, no signup. Just open the site and start counting.
Start Counting →Redemption centers and reverse vending machines make mistakes. Machines jam and miss containers. Staff at centers sometimes estimate by weight instead of counting, which almost always underpays you. If you walk in knowing your exact count, you can catch discrepancies and get what you're owed.
For example: if a center counts 180 cans by weight but you counted 210 with your camera, that's $1.50-$3.00 they owe you depending on your state's rate. Over a year of regular collecting, those differences add up to hundreds of dollars.