Motor Grader Productivity in India: Passes, Blade Width and Output per Hour

Motor grader productivity is the area of ground a grader finishes to level in one hour, measured in square metres per hour (m²/hr). It is not how fast the machine can drive. A grader earns its money only when a strip of road is cut to the level the engineer will accept, so the honest output figure is finished area, not distance covered.

Three things decide that figure: how wide a strip the blade covers in one pass, how many passes the road width needs, and how much of the hour the blade is actually in the ground. This guide works through all three using the published blade widths and speeds of the 42 motor graders listed on DesiMachines, and it is straight about the one number no manufacturer publishes. On a grader, output is a pass-count question before it is a speed question.

What is the formula for motor grader output per hour?

Output per hour is the effective blade width multiplied by the grading speed, divided by the passes the surface needs, with an allowance for the time the machine is not cutting.

Output (m²/hr) = Effective width (m) × Speed (m/hr) ÷ Passes × Working-time factor

Each term needs explaining, because three of the four are not what people assume.

• Effective width is not the blade width. A grader blade is set at an angle so soil rolls sideways off it instead of piling up in front, and an angled blade covers less ground than its own length.
• Speed here is grading speed, which is far slower than the travel speed on a spec sheet.
• Passes is how many times the machine goes over the same ground to reach level. A first cut on rough ground is not one pass.
• Working-time factor is the share of the hour the blade is really cutting. Forty-five working minutes in the hour, a factor of 0.75, is fair to plan with on a normal road job. It is the same allowance used in our road roller output figures.

How wide a strip does one motor grader pass actually cover?

Less than the blade, and the gap is bigger than most buyers expect. A 12 ft blade covers about 2.9 metres of ground per pass, not 3.66 metres.

Two things take the width away. The first is the blade angle. Turning the blade in plan is what makes material roll along the mouldboard and off the end, and the more you turn it, the narrower the strip it leaves. At about 30 degrees off square the blade covers roughly 87% of its length; at 45 degrees, about 71%. The second is overlap: each pass has to run into the last one so no ridge is left between them, and about 300 mm (0.3 m) is normal.

Blade angle is an operator setting, not a specification, so no machine publishes it. What the machines do publish is blade width, and the table turns the common sizes into the width that matters.

Effective width after a 0.3 m overlap allowance. Blade widths are the sizes that repeat across the 42 graders listed; the full width and weight breakdown by class is in our guide to motor grader weight and dimensions.

How many passes does a motor grader need for a road?

Divide the width you have to finish by the effective width of one pass, and round up. That number, not the machine’s speed, is what sets how long a stretch of road takes.

Indian road widths are standardised, which makes this easy to plan. A PMGSY link road is 3.0 m wide and a through road 3.75 m. An intermediate lane is 5.5 m, and a two-lane road without kerbs is 7.0 m. Add paved shoulders to a two-lane road and you are finishing about 10 m.

Passes to cover the width once, at a 30° blade angle with 0.3 m overlap. Road widths follow Indian Roads Congress and PMGSY practice.

Read the two-lane row carefully, because it is where the money is. A 10 ft blade needs four passes to cover a 7 m road; a 14 ft blade needs three. On a 5 km stretch that is 5 km less blade work before you have even started the second cut.

One warning on this table: it counts passes to cover the width once. Bringing a rough surface to a finished level takes several cuts over the same ground, and a formation layer can need three or four covers. Multiply.

How fast does a motor grader work while grading?

Nobody publishes it. Not one of the 42 graders listed carries a grading speed, and any figure you are quoted for one is a field estimate rather than a specification.

That absence is worth saying out loud, because road rollers do publish a working speed and it makes people assume graders must too. They do not. What a grader publishes is travel speed, 32.5 to 51.7 km/h across these machines. That is the speed it drives itself between jobs, and it tells you nothing about output. The full breakdown is in our guide to motor grader forward and reverse speed.

Grading happens far slower, near walking pace on finishing work, because the blade has to hold a steady height and any bounce shows up in the surface. So measure it rather than assume it. Time one pass with a phone: 200 m in three minutes is 4 km/h. Do that with your own operator and material and you have the only speed figure worth putting in the formula.

How much ground can a motor grader cover in an hour?

Between roughly 5,000 and 23,000 m² an hour, depending on blade width and the speed you grade at. The table runs the formula for one cover at a working-time factor of 0.75.

One cover of the ground at a 30° blade angle, 0.3 m overlap and 45 working minutes in the hour. The speed column is the speed you measure on your own job, not a published specification — no grader publishes one.

Turn that into road length and it gets easier to bid against. A 7 m two-lane road is 7,000 m² per kilometre, so a 12 ft blade at 5 km/h manages roughly 1.5 km of single cover per hour, or about 12 km in an eight-hour shift. If the formation needs three covers to come to level, that same shift finishes about 4 km. The three-cover number is the one to quote a client; the single-cover number is the one that gets contractors into trouble.

Why does the return leg decide your output?

Because a grader only cuts in one direction, and every metre it drives back is time you pay for and get nothing for.

The blade is set to cast material to one side, so at the end of a pass the machine reverses to the start rather than grading its way back. Reverse speed is published for every machine here, and it varies enormously: from 9.5 km/h on the Mahindra Roadmaster G80 up to 41.6 km/h on the Cat 24M.

Put that against the pass table. A 7 m two-lane road needs four passes with a 10 ft blade. Backing up 200 m four times at 9.5 km/h takes about five minutes; at 38.1 km/h, as the Cat 120 GC reverses, it takes about one and a half. Repeat that through a shift and the difference is real working time, not a rounding error.

It compounds with blade width rather than cancelling it: a narrow blade means more passes, and more passes means more return legs. If your work is long straight runs on highway or canal jobs, ask for the reverse speed in writing. The per-machine figures are set out in the motor grader speed guide.

What slows a motor grader down on an Indian site?

The formula gives a clean number. Sites do not. These are the things that take the difference out of it, roughly in order of how much output they cost.

• Hard or dry material. If the blade rides up over the surface instead of cutting in, you lose the pass. Watering the formation ahead of the grader does more for output than any change of gear.
• Extra covers. The biggest gap between a planned figure and a real one is assuming one cover where the job needs three. Count them honestly before you bid.
• Short runs and turning. Below about 100 m, the machine spends more time setting up and reversing than cutting. Village road work is slower per square metre than highway work for this reason alone.
• Traffic on the road. Grading under live traffic means stopping constantly, and the working-time factor drops well below 0.75.
• Operator skill. A grader is the hardest machine on an Indian site to run well. A good operator holds a level and needs fewer covers; a poor one puts in ridges the roller then locks into the surface.
• Waiting on the roller. If the compaction plant cannot keep up, the grader stops. Match the two: the output figures for the machine following you are in our guide to road roller productivity.

Comparing machines on output? Browse the full range of motor graders with live specifications and connect with a dealer.

Which blade width gives the most output for your job?

The widest blade your work can actually use, and the qualifier matters as much as the answer.

A wider blade cuts passes, and passes are the term in the formula with the most leverage. But a wide blade needs the engine and the weight behind it to hold a full cut, which is why the 16 ft machines listed run 280 HP and above and weigh 25 tonnes (25,000 kg) or more. Buying more blade than the machine can pull just means taking a shallower cut, and you give the passes straight back. Match it to the road instead:

• PMGSY and village roads, 3.0 to 3.75 m. A 10 ft blade covers a link road in two passes. Going wider buys nothing here, and the lighter machine is far cheaper to move between short jobs.
• State highway and site work, 5.5 to 7.0 m. The 12 ft blade is the standard answer, and 20 of the 42 graders listed are built around it. Three passes on a two-lane road with a machine that is easy to hire an operator for.
• Highway packages, 7.0 to 10 m with shoulders. A 13 or 14 ft blade drops a two-lane-plus-shoulders road from five passes to three. On a long package that is where the machine pays for itself.
• Haul roads and mass earthwork. The large and mining classes exist for open ground where nothing limits the blade, and most road contractors never need them.

Before you settle on a size, read the motor grader buying guide for the rest of the decision, and motor grader cutting depth and blade reach for how deep that blade will actually go. If you are weighing a grader against a dozer for bulk work, our motor grader versus bulldozer comparison covers it, and how motor graders work explains the blade and circle that all of this rests on.

A note on the figures in this guide

Everything above is worked from the published specifications of the 42 motor graders listed on DesiMachines, and it is fair to say where those specifications could not be used.

Six machines publish two different blade widths for the same grader, differing by 27 mm to 304 mm. The CASE 845C is the one that matters: its two figures, 3,962 mm and 3,658 mm, fall either side of a class boundary, so the same machine reads as a 13 ft grader on one line of its spec sheet and a 12 ft grader on another. The Fine FMG 130 and FMG 180 differ by 300 mm, the BEML BG405A and BG605I by 80 mm. These have been raised for correction. If you are buying one of them, get the blade width in writing before you order cutting edges against it.

Four machines were left out of the speed figures for the same reason they are excluded from the speed guide: the BEML BG825, which lists a reverse speed higher than its forward speed, the Komatsu GD825A-2 and GD535-6, which both list 3.9 km/h in reverse against a class that runs near 30, and the Fine FMG 585HD, whose forward figure sits far below every comparable machine.

The blade angle and grading speed used in the tables are working assumptions, clearly marked as such, because no manufacturer publishes either. Treat every figure here as a planning tool and confirm the specification for the exact variant and emission stage you are buying with the dealer.

Specifications quoted here are the standard published figures taken from our listings at the time of writing. Prices, specifications and features are indicative, vary by variant, location and date, and should always be confirmed with the official OEM or authorised dealer before any purchase decision. DesiMachines is not liable for decisions taken on the basis of information that may have changed after publication.

Motor grader productivity, in short

Output is a pass-count question. Effective blade width runs from about 2.30 m on a 10 ft machine to 3.92 m on a 16 ft one, once the blade angle and a 0.3 m overlap are taken off, and that is what decides whether a 7 m road takes two passes or four.

A 12 ft blade grading at 5 km/h covers roughly 10,761 m² an hour at 45 working minutes in the hour — about 1.5 km of single cover on a two-lane road. Plan on three covers to reach level and the honest figure is nearer 4 km in a shift.

No grader publishes a grading speed, so measure your own over one 200 m pass and put that number into the formula. Everything else in it comes off the spec sheet.

Reverse speed is the production figure nobody asks for. It ranges from 9.5 to 41.6 km/h here, and every extra pass a narrow blade forces is another return leg you pay for.

The same output question answered for the other machines on a road job: excavator productivity, backhoe loader productivity, wheel loader productivity and road roller productivity. For where the grader sits in the sequence on a levelling job, see excavator land levelling and grading and motor grader applications.

Ready to compare machines on blade width and output? See the full range of motor graders and current listings, or start with the complete motor grader guide.