A 43 oz jar will usually hold about 32,000 to 40,000 standard sprinkles , assuming you mean the common rod-shaped kind and the jar is filled normally rather than packed down tightly.
Why it is only an estimate
Sprinkles do not settle like water. The empty space between pieces changes the count a lot, so the same jar can hold very different amounts depending on sprinkle shape, size, and how tightly it is filled.
A useful reference point is that a 16 oz jar is often guessed at around 12,000 sprinkles in informal counting discussions, which works out to roughly 750 sprinkles per ounce. Using that rough pace, a 43 oz jar lands in the low 30,000s, and a more tightly packed jar can push the total higher.
What changes the count
- Sprinkle type: Rods, nonpareils, and confetti sprinkles do not pack the same way.
- Jar shape: A wide jar usually wastes less space than a tall, narrow one.
- Packing method: Shaking or tapping the jar increases the count a bit.
- Moisture and clumping: Sticky sprinkles can leave more gaps and lower the count.
A practical rule
For a quick estimate, use this range:
- Loose fill: about 30,000 sprinkles.
- Normal fill: about 35,000 sprinkles.
- Tight fill: about 40,000 or a little more.
If you are trying to buy sprinkles for a craft project or party favor, the safest answer is to plan on around 35,000 sprinkles for a 43 oz jar.