Day 5: Do the Table Math for Your Room

What size dining table do you need? Day 5 of the room challenge is the table math I do for every client: one simple formula for the widest dining table your room can hold, and how many people it will really seat.

Jill Seidner's Table Math Cheat Sheet: 24 inches of table per person, 36 inches from the table edge to the wall, room width minus 72 inches for the widest table, and seating sizes for round, oval and rectangle tables.
Day 5: my Table Math Cheat Sheet. Keep it on your phone for when you shop.

YOUR DESIGN GUIDE | ROOM CHALLENGE | DAY 5

Welcome to Day 5.

Yesterday you measured in Day 4. Today those numbers start working for you.

This is the day I wish every client had done before they fell in love with a table in a showroom. A table can be beautiful and still be wrong for the room, and you only find out when you can’t pull out a chair.

So let’s do the math. It’s easier than it sounds, and it takes about ten minutes. If you haven’t written down how you use the room yet, Day 3 is the place to start.

Step 1: Find your widest dining table size

Take the width of your dining space from your Day 4 sketch and subtract 72 inches.

Room width − 72″ = the widest table that fits.

Why 72? You need at least 36 inches on each side of the table for chairs to pull out and people to get by. So a room that’s 120 inches wide can hold a table up to 48 inches wide. A room that’s 108 inches wide, up to 36.

Do the same with the length of the room. Now you have the biggest table your room can comfortably hold.

That’s the limit. But it isn’t always the right size.

In this guide, you’ll get

  • The Table Math Cheat Sheet, ready to save on your phone
  • How many people each table shape and size really seats
  • The clearance rules I use: 24, 36 and 42 to 48 inches
  • When to choose round, oval, square or rectangle
  • The pedestal trick that squeezes in one more chair
  • A printable Day 5 checklist plus a table math worksheet to download

The rest of Day 5 is for paid members. Read the full post on Substack.


From my shop

Want the layouts, dimensions and lighting for every room in your home, dining space included? It’s all in my 151-page Complete Home Design Guide.

Cover of The Complete Home Design Guide by Jill Seidner Interior Design.
The Complete Home Design Guide: layouts, dimensions and lighting for every room.

Want help with your own room?

If you’d love a designer’s eye on your own dining space, my $397 Complete Room Design gives you a furniture plan, furnishing selections, a paint palette and a resource list for one room.

The $397 Complete Room Design by Jill Seidner Interior Design: a furniture plan, furnishing selections, a paint palette and a resource list for one room.
The $397 Complete Room Design for one room.

Dining table size: FAQ

How do I know what size dining table fits my room?
Take your room width and subtract 72 inches. That number is the widest table that fits. Do the same with the length.

Why subtract 72 inches?
You need at least 36 inches on each side of the table so chairs can pull out and people can get by.

What table fits a 120-inch-wide room?
A table up to 48 inches wide. A room that is 108 inches wide fits a table up to 36 inches wide.

Is the biggest table that fits the right one?
Not always. That’s the limit, not the answer. The full Day 5 lesson covers how many people each shape really seats, my clearance rules and when to choose round, oval, square or rectangle.


Read more on Substack: follow along with the room challenge, or subscribe for all the perks, including the full Day 5 cheat sheet, checklist and worksheet.

Originally published on Your Design Guide. Read the full post on Substack: Day 5: Do the Table Math for Your Room

Day 4: Measure Before You Decide Anything

Before you pick a single piece, you measure. Day 4 of the room challenge is how to measure a dining room the way I do it for clients, once and properly, so you don’t end up with the wrong table, the wrong rug or the wrong light.

Jill Seidner's Dining Room Clearances guide: the space to leave around a dining table so chairs pull out, people can walk behind seated guests, and doors and sideboards still open.
Day 4 guide: my dining room clearance numbers. These are the spaces your measurements have to leave room for.

YOUR DESIGN GUIDE | ROOM CHALLENGE | DAY 4

Welcome to Day 4.

You’ve looked at your room, chosen your direction in Day 2 and written down how you really use the space in Day 3.

Now, before we pick a single piece, we measure.

I know. It’s the least exciting day of the month. It’s also the one that saves you the most money. Nearly every returned dining table I’ve seen was a measuring problem, not a style problem. So today we do it the way I do it for clients, once and properly.

Today’s guides: my clearance numbers (above), plus my table-size-by-seats chart, rug and light sizing, and my measuring checklist, with a printable checklist and plan sheet in the full post.

Step 1: Gather your tools to measure your dining room

You need three things:

  • A 25-foot tape measure
  • Graph paper (one square = 6 inches)
  • A pencil, not a pen

Write every number in inches, not feet and inches. It sounds fussy, but it’s how you avoid the “was that 7’4″ or 74 inches?” mistake later.

Start at the floor and measure wall to wall in both directions. Write those two numbers in big letters at the top of the page.

Those two numbers matter. But they’re not the ones that usually ruin a plan.

In this guide, you’ll get

  • My dining room clearance guide: the space chairs, walkways and doors really need
  • My table size by seats chart, so you know what your room can hold
  • My rug and light sizing guide for the space over and under the table
  • My Designer’s Checklist: the 6 measurements I take in every dining room
  • How to draw door swings and mark outlets, vents and the ceiling light box
  • A printable Day 4 checklist plus a graph-paper plan sheet to download

The rest of Day 4 is for paid members. Read the full post on Substack.


From my shop

Want the layouts, dimensions and lighting for every room in your home, dining space included? It’s all in my 151-page Complete Home Design Guide.

Cover of The Complete Home Design Guide by Jill Seidner Interior Design.
The Complete Home Design Guide: layouts, dimensions and lighting for every room.

Want help with your own room?

If you’d love a designer’s eye on your own measurements and layout, book an online design consultation and we’ll talk through your room together.

Online design consultation with Jill Seidner Interior Design.
An online design consultation for your own room.

How to measure a dining room: FAQ

What do I need to measure my dining room?
A 25-foot tape measure, graph paper (one square = 6 inches) and a pencil, not a pen.

Should I measure in feet or inches?
Inches. Write every number in inches so you never mix up 7’4″ and 74 inches later.

Where do I start?
At the floor. Measure wall to wall in both directions and write those two numbers in big letters at the top of the page.

Is the room size the only number that matters?
No. Those two numbers matter, but they’re not the ones that usually ruin a plan. The full Day 4 lesson covers clearances, table size by seats, rug and light sizing and the 6 measurements I take in every dining room.


Read more on Substack: follow along with the room challenge, or subscribe for all the perks, including the full Day 4 guides and checklist.

Originally published on Your Design Guide. Read the full post on Substack: Day 4: Measure Before You Decide Anything

Day 0: Tomorrow, We Start With the Table You Already Have

The November Room Redesign Challenge starts today. Here’s how this dining room challenge works, and the one thing to do before Day 1.

YOUR DESIGN GUIDE | ROOM CHALLENGE | DAY 0

Welcome to November.

And welcome to the Dining Nooks + Dining Rooms challenge.

We are not starting by shopping for a new table.

We’re starting with the one you already have.

Because the most common thing I see in dining rooms is a room planned around a purchase. Someone falls in love with a table, buys it, and then tries to make the rug, the light and the chairs work around it.

Sometimes that works.

A lot of the time, the table is the wrong size, the light is hanging over the wrong spot, and the chairs scrape the wall every time someone sits down.

So this month, we’re doing it the way I’d approach a real design project: first we look, then we measure, then we plan, and only after that do we decide what (if anything) is worth buying.

It doesn’t matter whether you have a formal dining room, an open-plan dining area, a breakfast nook or one awkward corner off the kitchen. If it holds a table, it counts.

Your Design Guide November Room Challenge roadmap: Day 0 kickoff, then Days 1 to 7 figure out what you're working with, 8 to 14 build the dining plan, 15 to 21 color, walls and storage, 22 to 25 get ready to host, 26 to 30 finish it like a designer.
Thirty days, one short lesson a day. Thanksgiving lands on Day 25, so your dining room is ready first.

How the dining room challenge works

Every day from tomorrow, I’ll publish one short written lesson with one clear next step. Most take 15 to 30 minutes.

  • Week 1 (Days 1–7): Figure out what you’re working with.
    Photos, your design direction, shopping your own house, measuring, the table math and the flow.
  • Week 2 (Days 8–14): Build the dining plan.
    Chairs, banquettes, the rug, the light, and your own dining board.
  • Week 3 (Days 15–21): Color, walls + storage.
    Paint, wall finishes, art, windows and the sideboard.
  • Week 4 (Days 22–25): Get ready to host.
    The dinner plan, the table setting, the centerpiece and the buffet.
  • Final days (26–30): Finish it like a designer.
    Mix old and new, edit, and make your final shopping list.

There’s a catch-up day at the end of each week, so if Tuesday gets away from you, you won’t fall behind.

You can follow along daily or go at your own pace. The lessons stay in the archive.

What we’ll cover this month

Things like:

  • how big your table should really be
  • round, oval or rectangle
  • chairs that are comfortable for a long dinner
  • when a banquette beats chairs
  • the rug size that keeps chairs on the rug
  • how big the light should be, and how high to hang it
  • a color story for the room
  • art and the sideboard wall
  • storage for dishes and linens
  • setting a table that feels like you
  • a centerpiece people can talk over

And plenty of small things that make a surprisingly big difference.

  • Lowering a light six inches.
  • Swapping the two end chairs for a pair that doesn’t match.
  • Turning the table.
  • Moving a rug that’s two sizes too small to another room.

Sometimes the fix isn’t expensive.

It’s just something you wouldn’t have thought to change.

Week 1 includes the table math. If you want a preview, here’s the dining table math I do before anyone buys a table.

Jill's Dining Room Design Ideas guide: a round wood table with mixed chairs, a sculptural pendant and a styled sideboard, with design tips.
A round table with mixed chairs: one of the ideas we'll test in your own room in Week 2.

Print your dining room checklist

If you haven’t yet, grab the free Dining Nook + Dining Room Checklist (it’s linked in the challenge welcome post). It has what to measure, the clearances that make a table comfortable, the rug and lighting rules, and a hosting list for the week before Thanksgiving. We’ll use it all month.

Your one thing for today

Clear the table.

All of it. The mail, the laptop, the fruit bowl, the stack of things that “live” there.

Don’t style it, and don’t tidy the rest of the room. Just clear the table, so tomorrow we can see the room honestly.

Then tell me in the comments on Substack: what kind of dining space are you working with, and what’s the one thing that bothers you most about it?

I read every comment, and your answers help me shape the lessons ahead.

Tomorrow is Day 1. We start with photos, a fresh look at your space, and figuring out how you really use it before we change a thing.

Days 1–30 are for paid subscribers: $9 a month or $90 a year. Free gives you the ideas. Paid gives you the plan.


From my shop

Want a head start on Day 2, when we find your dining direction? The Big Book of Mood Boards has 140+ finished boards for every room of the home, plus a holiday section, to help you see what you like before you buy a thing.

Cover of The Big Book of Mood Boards by Jill Seidner: 140+ finished room boards, with sample pages and a living room mood board.
The Big Book of Mood Boards: 140+ finished boards for every room.

Here’s to a table you love gathering around.

Jill


Want help with your own room?

If you’d rather talk your dining room through with a designer before you buy anything, book an online design consultation with me. Bring your photos and measurements, and we’ll sort out the table, the rug and the light together.


Dining room challenge: FAQ

Do I need to buy a new dining table for this challenge?
No. We start with the table you already have. First we look, then we measure, then we plan, and only after that do we decide what (if anything) is worth buying.

What if I only have a breakfast nook or a corner off the kitchen?
It counts. A formal dining room, an open-plan dining area, a breakfast nook or one awkward corner off the kitchen: if it holds a table, it works for this challenge.

How much time does each lesson take?
One short written lesson a day, with one clear next step. Most take 15 to 30 minutes, and there’s a catch-up day at the end of each week.

Will my dining room be ready for Thanksgiving?
That’s the plan. Thanksgiving lands on Day 25, and Week 4 is all about getting ready to host: the dinner plan, the table setting, the centerpiece and the buffet.


Read more on Substack: follow along with the challenge, or subscribe for all the perks and the daily lessons.

Originally published on Your Design Guide. Read the post and the comments on Substack: Day 0: Tomorrow, We Start With the Table You Already Have