How much does a b-day usually cost? With food, decorations, and presents?

Spent about 350$ pulling off Chuck E Cheese

I'm planning on something small. Maybe at a local park or a house. Haven't decided on which one yet.

We do 100$ for the party decor 100$ for food and 300$ for gifts. what we do is have a big party and invite family then on their actually birthday we have a small party and they get to open their gifts from us

It does depend. I’ve spent $150-$800 before. School age kids are so much more expensive than a toddler.

It really depends. Is it at your house? renting a place? a park? etc. we did the boys party at a nature park so we had to pay for the cost of tour guide and pavilion to rent but we got lots of table decor and decorations, paper plates, etc. at the dollar store. We just kept the food to pizza, cake, fruit salad, chips and pretzels and drinks.

Plus we bought the plastic cups(plates, spoons/fork), candy, candy bags

It depends if the birthday is small or big

For my daughter, we did something really small. We got my mom's aunt to do her cake. My mom cooked. We just had to buy the decorations and her clothes. So we spent maybe 200. Not 100% sure.