Is metric ruler profitable to sell on Amazon United States?

The niche generates $153K/yr across 29 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -4.3%. Flapen's verdict: Worth a look (51/100).

How competitive is the metric ruler niche?

20 brands and 89 sellers compete. The top 5 products take 45% of clicks and top 5 brands hold 65% of demand.

What do buyers complain about in metric ruler?

Top complaints mined from reviews: Measurement/Reading Accuracy, Quality-Overall, Material Quality. The return rate is 0.8%.

When does demand for metric ruler peak?

Demand peaks in Jul–Aug; the busiest month runs 2.4× the quietest.

What does it cost to enter the metric ruler niche?

Listings span $2.08–$24.27; the average listing price is $8.34 (sweet spot $15–$100). The average incumbent carries 1,883 reviews — the moat a new listing must climb.

metric ruler

Worth a look

Shows low returns (0.8%), but soft demand (-4.3% this quarter) keeps it on the watch list.

Returns

Incredible0.8%

return rate — above 5% kills the launch gate

Conversion

Great8.9%

search→purchase rate — share of searches ending in a sale

Competition

Good45%

top-5 click share — leaders hold, buyers still browse

Brand share

Good65%

top-5 brand share — brands hold most of the demand

Review moat

Okay1,882.59

avg incumbent reviews — the moat a new listing must climb

Price range

Okay$2.08–$24.27

cheapest to priciest tracked listing — scored on the share inside $15–$100

Market size

Okay$153K

$153K/yr · 204K searches

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-4.3%

90-day search growth — must beat 0% to launch

Avg price

Bad$8.34

avg listing price — sweet spot $15–$100

Signals No Dominant Brand

According to Flapen's Amazon United States niche tracking, metric ruler is a $153K/yr Amazon United States market (204K searches/yr). The top 5 brands hold 65% of demand. Demand peaks in Jul–Aug. Verdict: Worth a look — 51/100.

Data updated Jul 28, 2026 · scored weekly · How we score niches

metric ruler market data

Units sold / yr: 15K–20K; avg 500–750/product
Revenue / yr: $125K–$167K; units × avg price
Conversion rate: 8.9%
Avg BSR: #52
Page quality: 0%
Prime: 97%
Sponsored: 90%
Out of stock: 0.0%
Avg brand age: 55 months
Avg seller age: 177 days

Competition & brand share

The top 5 products take 45% of clicks — established leaders, but buyers still shop beyond them.

Brands

20 falling

Sellers

Top-5 brand share

65%

Top 20: 100%

Top-5 click share

45%

Top 20: 92%

Open market

28%

Westcott18%
PEC Tools14%
Shinwa12%
Victor11%
Zotemo10%
Mr. Pen7%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -4.3% search growth over the last 90 days.

Peak months: Jul, Aug · busiest ÷ quietest = 2.4×

Open Trend

Top metric ruler search terms

metric ruler62K/yr +8.6%6.7% conv.
mm ruler48K/yr -2.9%6.5% conv.
millimeter ruler32K/yr -1.9%6.2% conv.
metric ruler metal10K/yr -7.6%6.1% conv.
cm ruler8K/yr -12.7%4.8% conv.
centimeter ruler8K/yr -18.2%5.4% conv.
mm ruler metal8K/yr -25.7%5.8% conv.
easy read ruler6K/yr -16.6%3.3% conv.
thin ruler4K/yr -6.9%3.0% conv.
ruler mm3K/yr -18.5%7.4% conv.

All search terms

Top metric 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Westcott Metric Ruler 30cm Transparent (M-108)

Westcott$2.944.4★278 rev

Shinwa 150 mm Rigid (15 mm x 0.5 mm) Zero Glare Satin Chrome Stainless Steel Machinist Engineer Ruler/Rule with Graduations in mm and .5mm Model 13005

Shinwa$6.534.8★1,270 rev

Mr. Pen- Machinist Ruler 4 Pack (6 8 12 14 Inch)

Mr. Pen$7.964.6★5,501 rev

Zotemo Metal Ruler Kit 12 Inch and 6 Inch Stainless Steel Rulers with Centimeters Millimeters Inches and Conversion Table for Office and School Easy to Read Metric Rule Set 2 Pack

Zotemo$9.904.7★514 rev

PEC Tools 6 x 150mm Machinist Metal Ruler High Carbon Steel English/Metric Markings 1/32 1/64 0.5mm 1mm Suitable for Engineers Between Imperial and Metric Systems Made in USA

PEC Tools$11.494.9★40 rev

Newest

by launch date

Zotemo Metal Ruler 6 Inch 2 Pack - Double Scale mm/inch Laser Etched - Small Stainless Steel Ruler with Zero-Start Edge Easy to Read Straightedge for Journaling Machinist School Office

Zotemo$9.9734 rev

7mo ago

PEC Tools 6/150mm Flexible Metal Ruler High-Quality Machinist Ruler Satin Chrome Finish Decimal/Metric Graduation (1/10 1/50 1mm 0.5mm) Suitable for CNC Operators and Engineers Made in USA

PEC Tools$9.8523 rev

8mo ago

PEC Tools 6 x 150mm Machinist Metal Ruler High Carbon Steel English/Metric Markings 1/32 1/64 0.5mm 1mm Suitable for Engineers Between Imperial and Metric Systems Made in USA

PEC Tools$11.4940 rev

12mo ago

DTDNZKN 3 Pcs Stainless Steel Rulers 6 8 12 (15cm 20cm 30cm)

DTDNZKN$3.89257 rev

1y ago

PEC Tools 150mm Flexible Metal Ruler Stainless Steel with Black Chrome Finish High Contrast Fully Metric Graduation (0.5mm 1.0mm) Easy to Read Machinist Rule Made in USA

PEC Tools$8.1119 rev

1y ago

What buyers say about metric ruler

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money20%

“Very affordable”

Quality-Overall18%

“High quality build”

Advertised Vs Actual Product11%

“As advertised”

Ease Of Use11%

“Easy to Read”

Measurement/Reading Accuracy5%

“These seem well made and accurate”

Durability4%

“No issues in the year of using it”

Strength3%

“Not flimsy”

Size-Overall3%

“Convenient sizes”

Design-Overall2%

“A fine piece of craftsmanship”

Efficiency2%

“PEC makes good stuff”

What buyers complain about

Measurement/Reading Accuracy14%

“Inaccurate reading”

Quality-Overall11%

“Bad quality”

Material Quality7%

“Mostly plastic”

Strength7%

“not very sturdy”

Durability6%

“did not last”

Value For Money5%

“It's cheaper”

Size-Overall5%

“Larger than I expected”

Thickness3%

“Clear thin plastic”

Advertised Vs Actual Product3%

“Not what I was looking for”

Sharpness2%

“Will cut you if not careful - very rough edges”

Top return reasons

Size-Overall18%

Quality-Overall10%

Functionality-Overall10%

Material Quality9%

Advertised Vs Actual Product9%

Defective Material/Parts7%

Value For Money7%