Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Scag SFC-30 — commercial: daily paid use and high acreage; 30-inch deck; gas powered
- Scag SFC-21 — commercial: daily paid use and high acreage; 21-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- SFC-30 lists at $2,999; SFC-21 lists at $1,699 to $2,049, a $1,300 difference. List price is the maker's own figure before tax, freight and dealer setup. Dealers set the final price.
- SFC-30 has a 7 hp engine; SFC-21 has a 4 hp engine, a 3 hp difference. Published horsepower is the maker's rating at a stated engine speed. It is a different measure from displacement, and two engines of equal rating can pull differently.
- SFC-30 holds 1 gal (3.8 L) of fuel; SFC-21 holds 0.4 gal (1.4 L) of fuel, a 0.6 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
- SFC-30 uses a Kohler® Command PRO® CV224 engine; SFC-21 uses a Honda engine. The engine maker builds the engine; the mower maker chooses the model, rating and fit, so the badge alone does not settle output or longevity.
- SFC-30 weighs 220 lbs (99.8 kg); SFC-21 weighs 136 lbs (61.7 kg), a 84 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What SFC-30's weight means for a trailer ›
4 more differences, calculated figures and what isn’t comparable
Other verified differences
- SFC-30 has a 30 in (762 mm) deck; SFC-21 has a 21 in (533 mm) deck, a 9 in difference.
- SFC-30 has a 13.7 ci (224 cc) engine; SFC-21 has a 9.9 ci (163 cc) engine, a 3.7 ci difference.
- SFC-30 cuts from 1.5 in (38 mm) to 5 in (127 mm); SFC-21 cuts from 1.5 in (38 mm) to 4.5 in (114 mm).
- SFC-30 has a published top speed of 4 mph; SFC-21 has a published top speed of 4.2 mph, a 0.2 mph difference.
Calculated by MowerFacts
- SFC-30 works out to 1.0 acres/hour; SFC-21 works out to 0.7 acres/hour, a 0.3 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Transmission: not published for SFC-30.
- Drive System: not published for SFC-21.
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | SFC-30 Scag · Push / Walk-Behind |
SFC-21 Scag · Push / Walk-Behind |
|---|---|---|
| List price | $2,999 | $1,699–$2,049 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 13.7 ci (224 cc) | 9.9 ci (163 cc) |
| Engine Power | 7 hp | 4 hp |
| Cylinders | — | 1 |
| Engine Make | Kohler® Command PRO® CV224 | Honda |
| Deck | ||
| Cutting Width | 30 in (762 mm) | 21 in (533 mm) |
| Min Cut Height | 1.5 in (38 mm) | 1.5 in (38 mm) |
| Max Cut Height | 5 in (127 mm) | 4.5 in (114 mm) |
| Deck Construction | 14-gauge, grade 100, Military Grade steel deck shell with 12-gauge spindle reinforcement plate. ¼” trim side reinforcement bar offers extra protection against impacts. | 14 gauge deck with 14-gauge replaceable guards for strength and longevity. Deep draw stamped. |
| Drive | ||
| Transmission | — | GT MG 512 transmission, 3-speed |
| Ground Speed | 4 mph | 4.2 mph |
| Drive System | GT MV 702 Transmission | — |
| Dimensions | ||
| Weight | 220 lbs (99.8 kg) | 136 lbs (61.7 kg) |
| Fuel Capacity | 1 gal (3.8 L) | 0.4 gal (1.4 L) |
SFC-30: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — scag.com.
SFC-21: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — scag.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.