How Many Pizzas for 20 People?
(Chart + Calculator)
A practical guide to ordering the right amount of pizza for groups of 20 — based on appetite, event type, and kids vs. adults.
For 20 people with average appetites, order 8 large 12-inch pizzas (64 slices, about 3.2 slices per person). For hungry guests, order 10. For light eaters or when serving other food, 6–7 pizzas can work. This assumes 12-inch pizzas cut into 8 slices each, with 3 slices per person as the baseline.
Pizza Chart for 20 People
Based on 12-inch pizzas with 8 slices each. Adjust for other sizes using the calculator below.
| Appetite Level | Slices per Person | Total Slices Needed | Pizzas to Order | Est. Cost |
|---|---|---|---|---|
| Light | 2 slices | 40 slices | 6–7 pizzas | $90–196 |
| Average (recommended) | 3 slices | 60–64 slices | 8 pizzas | $120–224 |
| Hungry | 4–5 slices | 80–100 slices | 10 pizzas | $150–280 |
Cost estimates based on $15–28 per large 12-inch pizza depending on region, toppings, and restaurant type.
Adjusting for Kids and Adults
Children typically eat about 2 slices of pizza while adults average 3 slices. Here is how to calculate for mixed groups of 20:
| Group Mix | Total Slices | Pizzas to Order |
|---|---|---|
| 20 adults | 60 slices | 8 pizzas |
| 16 adults + 4 kids | (16×3) + (4×2) = 56 slices | 7 pizzas |
| 12 adults + 8 kids | (12×3) + (8×2) = 52 slices | 7 pizzas |
| 10 adults + 10 kids | (10×3) + (10×2) = 50 slices | 7 pizzas (or 6 with sides) |
| All 20 kids | 40 slices | 5–6 pizzas |
Round up to the next whole pizza when the math falls in between. An extra pizza costs $15–28; running out is a much bigger problem.
How Many Pizzas by Event Type
The occasion changes how much people eat. Here is a quick guide for 20 people:
| Event Type | Pizzas for 20 People | Notes |
|---|---|---|
| Office lunch / meeting | 6–8 pizzas | People eat less at work events; 6–7 if sides are included |
| Birthday party (adults) | 8–10 pizzas | Evening + drinks = higher consumption; 9–10 to be safe |
| Kids birthday party | 5–6 pizzas | Children eat 2 slices average; adjust for adult chaperones separately |
| Casual hangout / game night | 8–10 pizzas | Long events, more eating; aim for 9–10 for an evening event |
| Dinner party with sides | 6–7 pizzas | Multiple dishes reduce pizza consumption |
| Sports viewing party | 10 pizzas | Highest-consumption event; 10 pizzas is the right call |
Cost Estimates for 20 People
What does pizza for 20 people actually cost? It depends on where you order, your toppings, and how many pizzas you get:
| Scenario | Pizzas | Price per Pizza | Total Cost |
|---|---|---|---|
| Budget (chain, basic toppings) | 8 | $12–15 | $96–120 |
| Mid-range (chain, specialty) | 8 | $16–22 | $128–176 |
| Average (typical delivery) | 8 | $18–25 | $144–200 |
| Local pizzeria / premium | 8 | $22–30 | $176–240 |
| 10 pizzas (hungry / safe) | 10 | $18–25 | $180–250 |
Add 15–20% for delivery fees and tip when ordering delivery. Budget $180–320 all-in for most real-world scenarios with 8–10 large pizzas for 20 people.
Pro Tips for Ordering Pizza for 20
- Start with 8 pizzas as your baseline and add based on the factors below
- Order variety — at minimum, include one plain cheese for picky eaters
- Consider half-and-half options to satisfy more preferences per pizza
- For dietary needs, order a separate veggie or GF pizza — it will be eaten
- Use a deal bundle — most chains offer 4- or 8-pizza deals
- Order at least 90 minutes in advance for groups of 20
- Order larger pizzas (16-inch if available) — better value per square inch; 6–7 pies can replace 8 standard ones
- Pickup saves 20–30% on a large order vs. delivery
- Stick to 2–3 toppings max per pizza to keep costs down
- Check for online order discounts — many chains offer 20–25% off
- Split the order between 2 different restaurants for variety and redundancy