18 inch ruler
Worth a lookShows low returns (0.5%), but strong incumbent ratings (4.7★) keeps it on the watch list.
Returns
Incredible0.5%return rate — above 5% kills the launch gate
Conversion
Great9.7%search→purchase rate — share of searches ending in a sale
Brand share
Great59%top-5 brand share — no brand owns this niche
Competition
Good47%top-5 click share — leaders hold, buyers still browse
Review moat
Good1,178.5avg incumbent reviews — the moat a new listing must climb
Price range
Okay$2.08–$26.37cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Okay$10.90avg listing price — sweet spot $15–$100
Growth
Bad-2.5%90-day search growth — must beat 0% to launch
Market size
Bad$88K$88K/yr · 83K searches
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 18 inch ruler is a $88K/yr Amazon United States market (83K searches/yr). The top 5 brands hold 59% of demand. Demand peaks in Jan–Feb. Verdict: Worth a look — 52/100.
Data updated Jul 28, 2026 · scored weekly · How we score niches
18 inch ruler market data
- Units sold / yr
- 10K–13K
- avg 250–500/product
- Revenue / yr
- $109K–$136K
- units × avg price
- Conversion rate
- 9.7%
- Avg BSR
- #95
- Page quality
- 0%
- Prime
- 81%
- Sponsored
- 73%
- Out of stock
- 0.0%
- Avg brand age
- 64 months
- Avg seller age
- 182 days
Competition & brand share
The top 5 products take 47% of clicks — established leaders, but buyers still shop beyond them.Brands
16 rising
Sellers
84
Top-5 brand share
59%
Top 20: 99%
Top-5 click share
47%
Top 20: 95%
Open market
33%
- Pacific Arc16%
- Psyqtsuary14%
- ZZTX11%
- WSICSE10%
- Johnson8%
- Sliverdew7%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -2.5% search growth over the last 90 days.Peak months: Jan, Feb · busiest ÷ quietest = 1.9×
Top 18 inch ruler search terms
- 18 inch ruler17K/yr
- metal ruler 18+ inch17K/yr
- metal ruler 18 inch14K/yr
- ruler 18 inch9K/yr
- 18 ruler9K/yr
- 18 metal ruler5K/yr
- 18 inch metal ruler5K/yr
- stainless steel ruler 18 inch3K/yr
- steel ruler 18 inch3K/yr
Top 18 inch ruler products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Metal Ruler 18 Inch - Stainless Steel Metal Ruler with Cork Backing Non-Slip Rulers with Inch and Centimeters Prevent Ink Leakage for School Office Drawing Engineering Tools
Psyqtsuary$9.994.8★19 rev
Pacific Arc Stainless Steel Ruler with Inch and Pica Measurements 18 Inches Rubber Backed
Pacific Arc$12.904.6★470 rev
Johnson Level & Tool J118 Aluminum Rule 18 Silver 1 Rule
Johnson$4.074.6★767 rev
Metal Ruler with Cork Backing 6+12+18 Inch Stainless Steel Metal Ruler Non-Slip Rulers with Inch and Centimeters Straight Edge Cork Base Rulers for Drafting Office Tools Prevent Ink Leakage
Sliverdew$11.974.6★120 rev
VORIGY 18 Inch Metal Ruler with Cork Backing Imperial & Metric Markings
VORIGY$15.994.3★250 rev
Newest
by launch date
Metal Ruler 12+18 Inch Stainless Steel Ruler with Cork Backing
WSICSE$9.9540 rev
Metal Ruler 6+12+18 Inch Stainless Steel Ruler with Cork Backing
WSICSE$11.9340 rev
Metal Ruler 18 Inch - Stainless Steel Metal Ruler with Cork Backing Non-Slip Rulers with Inch and Centimeters Prevent Ink Leakage for School Office Drawing Engineering Tools
Psyqtsuary$9.9919 rev
Metal Ruler with Cork Backing 6+12+18 Inch Stainless Steel Metal Ruler Non-Slip Rulers with Inch and Centimeters Straight Edge Cork Base Rulers for Drafting Office Tools Prevent Ink Leakage
Sliverdew$11.97120 rev
VORIGY 18 Inch Metal Ruler with Cork Backing Imperial & Metric Markings
VORIGY$15.99250 rev
Trending
90-day click momentumMetal Ruler 6+12+18 Inch Stainless Steel Ruler with Cork Backing
WSICSE$11.934.9★
Metal Ruler 12+18 Inch Stainless Steel Ruler with Cork Backing
WSICSE$9.954.9★
Metal Ruler 18 Inch - Stainless Steel Metal Ruler with Cork Backing Non-Slip Rulers with Inch and Centimeters Prevent Ink Leakage for School Office Drawing Engineering Tools
Psyqtsuary$9.994.8★
Pacific Arc Stainless Steel Ruler with Inch and Pica Measurements 12 Inches Cork Backed
Pacific Arc$8.544.7★
Westcott 18 Acrylic Ruler
--$10.314.7★
What buyers say about 18 inch ruler
What buyers praise and complain about, mined from review topics.What buyers love
“As advertised”
“The variety is super nice to have”
“Great value”
“Well made not flimsy”
“Metal is the way to go, no chipping, precise, and will last a lifetime”
“Very handy for everyday use”
“Great sizes”
“They're clean and legible and accurate”
“Good and durable”
“it stays fairly stable while using it on paper”
What buyers complain about
“No Metric”
“Extremely cheap for a flimsy ruler”
“Considering the quality and utility, the price is ridiculous”
“The ruler is too large to store in my drawers”
“it broke within the first month”
“Super cheap”
“It seems to be too thin”
“The way these are made makes them very difficult to use”
“The cork backing didnt provide enough grip on glass”
“Only minor downside is that the edges can feel a bit sharp if youre not careful”
Top return reasons
Common questions
- Is 18 inch ruler profitable to sell on Amazon United States?
- The niche generates $88K/yr across 26 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -2.5%. Flapen's verdict: Worth a look (52/100).
- How competitive is the 18 inch ruler niche?
- 16 brands and 84 sellers compete. The top 5 products take 47% of clicks and top 5 brands hold 59% of demand.
- What do buyers complain about in 18 inch ruler?
- Top complaints mined from reviews: Measurement/Reading Accuracy, Strength, Value For Money. The return rate is 0.5%.
- When does demand for 18 inch ruler peak?
- Demand peaks in Jan–Feb; the busiest month runs 1.9× the quietest.
- What does it cost to enter the 18 inch ruler niche?
- Listings span $2.08–$26.37; the average listing price is $10.90 (sweet spot $15–$100). The average incumbent carries 1,179 reviews — the moat a new listing must climb.