Does no reply mean they aren’t coming?

Usually not. The most common reason is that the invitation was read at an awkward time and the reply was postponed. Follow up once before you draw any conclusions.

How long should I wait before I send a reminder?

Three to four days after the invitation feels about right. It’s still fresh enough to be remembered, and you’re early enough to send a second reminder before the deadline if needed.

Should I call the families who haven’t replied?

A phone call works, but save it for the last one or two families right before you have to lock in the booking. A short direct message saying you need to confirm the final headcount tomorrow usually does the trick.

How many extra guests should I plan for?

It depends on what an extra child costs and what the venue can accommodate, not on a percentage. Ask about the final change deadline and the per-child price, then let those two numbers set your margin.

How many people actually RSVP to birthday invitations?

The short answer is that there is no reliable figure to look up. Nobody keeps official statistics on RSVP rates for children's birthday parties, and any percentages you find online are usually guesses. The useful question is therefore a different one: what do you do when the replies don't come in, and how do you book without knowing the final headcount?

Why there's no single number

RSVP rates depend on factors that vary from one party to the next: how the invitation was sent, whether a deadline was set, how easy it was to reply, how well the parents know each other, and what time of year it is. An invitation posted in a group chat without a deadline behaves very differently from one with its own reply link and a set date. That's why the honest answer is that you can't plan around a percentage—you need to plan around a process.

Silence rarely means no

This is the most important interpretation, and the one most people get wrong. A parent who hasn't replied has usually not decided against coming. They read the invitation at an inconvenient moment and put off answering. If you treat silence as a no, you end up booking too little. If you treat it as "not yet," you do the right thing: you send one polite follow-up and plan with a buffer.

How to calculate realistically

Start with the confirmed yeses and add a small buffer for those who haven't replied. How large the buffer should be depends on the cost of one extra child, not on a percentage: if the marginal cost is low, such as at home, you can be generous. If you're paying per child at a play center, ask what the last possible date is to change the number and use that date as your real RSVP deadline.

How to raise your response rate

Three steps make the biggest difference, and they all reduce friction. Send the invitation directly to one parent instead of a group. Make replying a single tap, not a message they have to write. Set a deadline with a reason, such as needing to report numbers to the venue. Add one friendly reminder a few days later, and you've done everything that is actually in your control.

When you have to book before everyone has replied

It almost always happens. Ask the venue three things when you book: the final deadline for changing the headcount, what an extra child costs, and whether you get a refund for a child who doesn’t show. Their answers tell you whether to book low and adjust upward or book high and keep some wiggle room. Most places accept an extra child more easily than they refund an unused spot, so a small margin is the safest bet.