---
title: "21 Inch Lawnmower — $136K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/21-inch-lawnmower"
last_updated: "2026-08-09T03:50:16.837Z"
locale: en
meta:
description: "Niche score 58/100 · $136K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 58/100 · $136K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "21 Inch Lawnmower — $136K/yr Amazon US Niche (2026) - Flapen"
---
# **21 inch lawnmower**
**Worth a look**
Shows demand growing +136.8% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 30Growth 96Conversion 9Competition 80Returns 65Price range 0Avg price 27Brand share 60Review moat 63Quality gap 93
**Growth**
**Incredible****+136.8%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Great****4.0★**
avg incumbent rating — lower means beatable quality
**Competition**
**Great****35%**
top-5 click share — an open shelf
**Returns**
**Good****2.4%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****965.32**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Good****69%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****$136K**
$136K/yr · 58K searches
**Avg price**
**Okay****$327.61**
avg listing price — sweet spot $15–$100
**Conversion**
**Bad****0.7%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Bad****$128.43–$812.55**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, 21 inch lawnmower is a $136K/yr Amazon United States market (58K searches/yr). The top 5 brands hold 69% of demand. Demand peaks in Apr–May–Jun–Jul. Verdict: Worth a look — 58/100.
Data updated Jul 16, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **21 inch lawnmower market data**
- **Units sold / yr**
- **250–500**
- avg 0–100/product
- **Revenue / yr**
- **$82K–$164K**
- units × avg price
- **Conversion rate**
- **0.7%**
- **Avg BSR**
- **#172**
- **Page quality**
- **0%**
- **Prime**
- **81%**
- **Sponsored**
- **89%**
- **Out of stock**
- **19.7%**
- **Avg brand age**
- **33 months**
- **Avg seller age**
- **142 days**
## **Competition & brand share**
Clicks spread well past the top 5 (35% combined) — an open shelf where new products get seen.
**Brands**
**20 **—flat
**Sellers**
**42**
**Top-5 brand share**
**69%**
Top 20: 100%
**Top-5 click share**
**35%**
Top 20: 74%
**Open market**
**24%**
- Greenworks36% - Skil10% - Stihl8% - WORX7% - EGO Power+7% - LiTHELi7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +136.8% search growth over the last 90 days.
3K2KSpike '25Prime Day '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul · busiest ÷ quietest = 9.6×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/21-inch-lawnmower/trend)
## **Top 21 inch lawnmower search terms**
- **electric self propelled lawn mower**21K/yr+107.8%0.9% conv. - **cordless self propelled lawn mower**10K/yr+255.4%0.6% conv. - **stihl mower**5K/yr+200.8%0.0% conv. - **stihl lawn mower battery powered**4K/yr+217.3%0.3% conv. - **stihl electric lawn mower**4K/yr+167.6%0.2% conv. - **hart electric lawn mower**4K/yr+81.8%0.2% conv. - **yard force lawn mower**4K/yr+81.6%0.1% conv. - **lawnmower gas self propelled**4K/yr+48.8%0.2% conv. - **push gas lawnmower**1K/yr+137.6%0.2% conv. - **21 inch lawnmower**531/yr+130.3%0.9% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/21-inch-lawnmower/search-terms)
## **Top 21 inch lawnmower 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.
0%3%$4K6%$8K9%$12K12%$16K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**SKIL PWR CORE 40 Brushless 40V 20-Inch Self-Propelled Mower Kit Includes 6.0Ah Battery and Auto PWR JUMP Charger - SM4910C-11**Skil**$345.13**4.5★159 rev](https://www.amazon.com/dp/B0D8VHPYWJ) [2**Stihl RME 235 1.2 kW 13 kg Lightweight Electric Lawn Mower with 33 cm Cutting Width With 30 Litre Grass Collection with Level Indicator**Stihl**$374.51**4.3★60 rev](https://www.amazon.com/dp/B07Z6NPR53) [3**Greenworks 80V 21 Self-Propelled Cordless Lawn Mower Brushless Motor LED Lights 4.0Ah Battery & Rapid Charger (75+ Compatible Tools)**Greenworks**$467.98**4.5★548 rev](https://www.amazon.com/dp/B0CLSC6B2T) [4**Greenworks 40V 16 (Push) Cordless Lawn Mower 4.0Ah Battery (1/3 Acre Push Button Start Compatible with 75+ Tools)**Greenworks**$228.07**4.2★12,027 rev](https://www.amazon.com/dp/B00BBQVL5U) [5**Greenworks 60V 21 Brushless (Self-Propelled) Cordless Lawn Mower 2 x 4.0Ah Batteries (3/4 Acre Rapid Charger 4-in-1 LED Lights IPX4)**Greenworks**$477.88**4.5★582 rev](https://www.amazon.com/dp/B09SY912MK)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**40V Cordless Lawn Mower 17 Walk Behind Electric 4.0 Ah Battery Powered Lawnmower with 50L Grass Bag Brushless Motor 6 Adjustable Cutting Heights for Garden/Patio/Yark/Lawn**etoolab**$205.44**51 rev2mo ago](https://www.amazon.com/dp/B0GXXSS33Q) [**Litheli 18-inch 40V Self-Propelled Brushless Lawn Mower for Garden Yards Lightweight Cordless Mower with 6-Position Height Adjustment 25.0Ah Batteries Included**LiTHELi**$214.11**20 rev3mo ago](https://www.amazon.com/dp/B0GTXMJXW6) [**18 Electric Lawn Mower 40V Self-Propelled Cordless Mower with 2x5.0Ah Batteries & Type-C Cables Brushless Motor 2-in-1 Mulching & Bagging 6-Position Height Adjustment for Small to Medium Yards**KraftSense**$199.24**25 rev4mo ago](https://www.amazon.com/dp/B0GR46N6SN) [**Litheli Lawn Mower 18 Electric Self Propelled for Garden Yards Lightweight Cordless Lawn Mower Brushless with 6-Position Height Adjustment 2 x 20V 4.0Ah Battery**LiTHELi**$232.81**36 rev1y ago](https://www.amazon.com/dp/B0FB3H9NMP) [**Litheli 18 Self-Propelled Lawn Mower 40V Battery Lawn Mower(2 x 5.0Ah) Push Mower with Brushless Motor 2-in-1 Mulching & Bagging**LiTHELi**$192.77**280 rev1y ago](https://www.amazon.com/dp/B0F8MRQNTN)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**18 Electric Lawn Mower 40V Self-Propelled Cordless Mower with 2x5.0Ah Batteries & Type-C Cables Brushless Motor 2-in-1 Mulching & Bagging 6-Position Height Adjustment for Small to Medium Yards**KraftSense**$199.24**2.8★**▲ 82%**](https://www.amazon.com/dp/B0GR46N6SN) [**40V Cordless Lawn Mower 17 Walk Behind Electric 4.0 Ah Battery Powered Lawnmower with 50L Grass Bag Brushless Motor 6 Adjustable Cutting Heights for Garden/Patio/Yark/Lawn**etoolab**$205.44**3.7★**▲ 80%**](https://www.amazon.com/dp/B0GXXSS33Q) [**Litheli 18-inch 40V Self-Propelled Brushless Lawn Mower for Garden Yards Lightweight Cordless Mower with 6-Position Height Adjustment 25.0Ah Batteries Included**LiTHELi**$214.11**2.0★**▲ 80%**](https://www.amazon.com/dp/B0GTXMJXW6) [**Litheli 18 Self-Propelled Lawn Mower 40V Battery Lawn Mower(2 x 5.0Ah) Push Mower with Brushless Motor 2-in-1 Mulching & Bagging**LiTHELi**$192.77**3.9★**▲ 74%**](https://www.amazon.com/dp/B0F8MRQNTN) [**Stihl RME 235 1.2 kW 13 kg Lightweight Electric Lawn Mower with 33 cm Cutting Width With 30 Litre Grass Collection with Level Indicator**Stihl**$374.51**4.3★**▲ 45%**](https://www.amazon.com/dp/B07Z6NPR53)
**~~View all trending →~~**
## **What buyers say about 21 inch lawnmower**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Ease Of Use**13%
*“Easy to attach”*
**Weight Light**10%
*“Lightweight and easy to use”*
**Cutting/Trimming**9%
*“Cut great”*
**Value For Money**9%
*“Very affordable”*
**Battery Life**8%
*“Battery is good”*
**Quality-Overall**8%
*“Excellent product”*
**Assembly/Installation**8%
*“Assembly is simple”*
**Motor Power**4%
*“PLENTY of power”*
**Advertised Vs Actual Product**3%
*“AS DESCRIBED”*
**Charging**3%
*“Charges fast”*
### **What buyers complain about **
**Battery Life**19%
*“Battery drained”*
**Durability**8%
*“broke after one use”*
**Quality-Overall**7%
*“Bad quality”*
**Functionality-Overall**6%
*“Didn't work”*
**Charging**5%
*“Can't hold charge”*
**Value For Money**4%
*“It's a little expensive”*
**Size-Overall**4%
*“it doesn't fit”*
**Ease Of Use**3%
*“Difficult to use”*
**Cutting/Trimming**2%
*“It does not cut evenly”*
**Weight Heavy**2%
*“Very heavy”*
### **Top return reasons **
**Functionality-Overall**17%
**Battery Life**16%
**Size-Overall**13%
**Defective Material/Parts**8%
**Cutting/Trimming**7%
**Advertised Vs Actual Product**6%
**Charging**5%
**Value For Money**5%
**Durability**3%
**Mechanism Issues**3%
## **Common questions**
- **Is 21 inch lawnmower profitable to sell on Amazon United States?**
- The niche generates $136K/yr across 53 tracked products. 14 of 18 products launched in the last 360 days are still selling. 90-day search growth is +136.8%. Flapen's verdict: Worth a look (58/100).
- **How competitive is the 21 inch lawnmower niche?**
- 20 brands and 42 sellers compete. The top 5 products take 35% of clicks and top 5 brands hold 69% of demand.
- **What do buyers complain about in 21 inch lawnmower?**
- Top complaints mined from reviews: Battery Life, Durability, Quality-Overall. The return rate is 2.4%.
- **When does demand for 21 inch lawnmower peak?**
- Demand peaks in Apr–May–Jun–Jul; the busiest month runs 9.6× the quietest.
- **What does it cost to enter the 21 inch lawnmower niche?**
- Listings span $128.43–$812.55; the average listing price is $327.61 (sweet spot $15–$100). The average incumbent carries 965 reviews — the moat a new listing must climb.
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