Posts Tagged “flower formulas”

How Many Flowers for Flower Wall


calculating flower wall flowers

I typically start my day checking social media pages and Facebook groups. This morning I came across someone asking how many roses do you need per square foot when designing a flower wall? If you have the same question, here is my answer that you can use if you are trying to cover any type of surface with flowers.

You may remember that I love flower math! So here is the math broken down step-by-step so you can figure it out depending on whatever flower(s) you want to use.


I am going to use a 5-foot by 8-foot flower wall as an example:

  1. calculate the total area of the wall in inches; (e.g. for a 5×8 wall …. 60 in. x96 in. = 5760 sq. in.)
  2. determine the average area of the flower you will use in square inches (e.g. 2 inch flower  – depends on variety this will need to be adjusted …. Multiply Pi (3.1416) with the square of the radius …. 3.1416*1*1 = 3.1416)
  3. divide wall area by flower area (e.g. 5760/3.1416 = 1833-ish)
  4. you will need roughly 1833 roses for a 5 ft x 8 ft wall, but that will need to be adjusted based on your design, spacing, other flowers that you may use, etc)


If you simply want to know how many flowers per square foot, again this depends on how wide the flower is.

If the flower is 2 inches wide, then:

  1. 12 inches x 12 inches = 144 square inches
  2. 2 inch flower = 3.1416 square inches
  3. 144/3.1416 = 45.83


You would need about 45 flowers to cover one square foot.

If the flower is 3 inches wide, then:

  1. 12 inches x 12 inches = 144 square inches
  2. 3 inch flower (3.1416*1.5*1.5) = 7.07 square inches
  3. 144/7.07 = 20.37


You would need a little over 20 flowers to cover one square foot.

Here are some other flower calculation blogs that I’ve done:

How to determine the number of flowers to cover a round table:

How to determine the number of flowers for flower balls:

I would love to hear from you about how your flower wall design projects have gone. Share links to your designs in the comments below.

Flowers & Geometry: Spheres & Balls

I recently saw a question about how many carnations would it take to cover a floral foam sphere or ball.  Upon ready this question, I thought back to my previous blog post in which I discussed how you come up with how many flowers to cover a round flat surface, like a round table.  And then I wondered why I didn’t discuss a sphere as that seems just a common.

So, the nerdy part first …. the formula to figure out the surface area for any sized sphere or ball is 4*Pi*r2 (Pi = 3.14159).  But if you want a short-cut to figure this all out, visit (you can calculate the area for a circle, sphere, or a cylinder.  All you need to do is enter the diameter and then the calculator will spit out several numbers.  You just need the AREA.  (If you Google “area of sphere calculator” you will get results for many other calculators as well.)

For this post, let’s say you want to cover a 12” floral foam ball with carnations that are 2” when fully opened.  A 12” sphere will have an area of 452.39 inches.  Divide that number by 2 which equals 226.195.  So you will need about 226 carnations to cover a 12 inch ball.

Pretty cool – right?  Who said you weren’t going to use those pesky math skills in real life?


Flowers & Geometry

So the nerd in me got very excited when I saw in my inbox the following message from Viviana Grasso of Petal Play Design:

Hello! I need help! I have to cover a 60″ round table with white football mums, is there some sort of recipe to try to figure out how much to order? thanks!

Yep, I’m one of those nerdy girls who finished high school math with Calculus.  So when I get a math question, I get happy.  Maybe you all already have a way to solve this question, but just in case I wanted to share my answer with you. So here is what I came up with:

You can use the geometric formula to figure out the area of a table and divide that by the area of the football mum (
Using the formula R * R * Pi (R=radius), you would get 2827.4333 square inches for the table, then if you divide that by the what the average area of a football mum or the flower you are working with (for arguments sake let’s say an average mum is 3.5 inches then the area would be 9.6211 square inches) … that equals 293.878 – I would order around 300 stems plus a bit extra.

I’m happy to say that Petal Play Design just sent over pictures of the table they designed (below) and said that the formula worked just as we thought.  Beautiful isn’t it?

Let me know what other floral formulas you have used or other floral math problems that you may need help solving!


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