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Acres Per Day / Productivity Calculator

Estimate how long a forestry mulching job will take based on your equipment, vegetation density, and terrain. Research-backed production rates from Caterpillar, Fecon, Denis Cimaf, and FAE field data.

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The math, shown transparently

No black box. Here is exactly what the calculator computes when you change an input. (Source: Caterpillar Performance Handbook Ed. 49, Fecon product specs, Denis Cimaf production data, FAE Group field studies)

// Production rate adjusted for vegetation and terrain

acresPerHr = baseRate x vegMultiplier x terrainMultiplier

acresPerDay = acresPerHr x hoursPerDay

daysNeeded = ceil(acreage / acresPerDay)

// Base rates (acres per hour) by equipment

Mini excavator: 0.15 - 0.25 ac/hr

Skid steer / CTL: 0.20 - 0.35 ac/hr

Mid excavator: 0.30 - 0.50 ac/hr

Large dedicated: 0.50 - 0.80 ac/hr

Bulldozer: 0.40 - 0.60 ac/hr

// Vegetation multipliers

Light: 1.00 | Medium: 0.65 | Heavy: 0.40 | Dense hardwood: 0.25

// Terrain multipliers

Flat: 1.00 | Rolling: 0.85 | Steep: 0.65 | Rocky: 0.55

Worked example

5 acres, heavy brush, mid excavator (20-30 ton), rolling terrain, 8-hour days:

base_rate = 0.30 - 0.50 ac/hr (mid excavator)

veg_multiplier = 0.40 (heavy brush)

terrain_mult = 0.85 (rolling)

acresPerHr_low = 0.30 x 0.40 x 0.85 = 0.102 ac/hr

acresPerHr_high = 0.50 x 0.40 x 0.85 = 0.170 ac/hr

acresPerDay_low = 0.102 x 8 = 0.816 ac/day

acresPerDay_high = 0.170 x 8 = 1.360 ac/day

days_optimistic = ceil(5 / 1.360) = 4 days

days_conservative = ceil(5 / 0.816) = 7 days

total_hours = 29.4 - 49.0 machine hours

What affects production rates

Vegetation density is the biggest factor. A field of 2-inch saplings disappears under a mulcher head. A stand of 12-inch oaks does not. Each mature tree requires the operator to position carefully, apply sustained pressure, and let the cutting teeth do the work. Dense hardwood cuts production by 75% compared to light brush.

Equipment class matters almost as much. A large dedicated mulcher like the FAE PT-475 processes material 2-4 times faster than a skid steer because it has more horsepower, a wider cutting head, and heavier hydraulic flow. The tradeoff is cost: dedicated mulchers run $400,000 or more versus $80,000-$120,000 for a skid steer with a mulcher attachment.

Terrain slows everything down. Rocky ground forces the operator to pick through carefully because every rock hit is a potential broken carbide tooth at $20 each. Steep slopes mean the machine spends energy fighting gravity instead of cutting. A flat site with clear access lets the operator work in efficient, systematic passes.

Other factors not captured by this calculator include operator skill (experienced operators are 30-50% faster), machine condition (dull teeth cut production significantly), weather (wet ground slows travel between passes), and site access (narrow access points add travel time). Use the conservative estimate when bidding.

Frequently asked questions

How many acres can a forestry mulcher clear in a day?

It depends on equipment and vegetation. A skid steer in light brush does 2-3 acres per day. A large dedicated mulcher (FAE PT-475, Fecon FTX148) in light brush can hit 4-6 acres per day. Dense hardwood with 12-inch-plus trees drops everyone to 0.5-2 acres per day because each tree takes real time to process.

What equipment clears land the fastest?

Large track-mounted dedicated mulchers like the FAE PT-475 and Fecon FTX148 are the fastest, clearing 4-6 acres per day in light brush. They clear 2-4 times faster than skid steers but cost $400,000 or more and require more mobilization effort. For most contractors, a mid-size excavator (20-30 ton) with a mulcher head is the best balance of speed, cost, and versatility.

Does terrain affect mulching speed?

Yes, significantly. Rocky terrain cuts production 40-45% because operators must avoid rocks that damage carbide teeth and cutting chambers. Every rock hit is a potential broken tooth. Steep slopes cut production about 35% due to reduced stability, more cautious operation, and higher fuel burn as the machine fights gravity on every pass.

How do I estimate job duration for a bid?

Use conservative (low) production rates for bids. It is better to finish early than go over. Add a half-day buffer for mobilization and site prep. For example, if the calculator says 3-5 days, bid 5.5 days. Your customer will be happy when you finish on day 4, and you will not lose money if conditions are worse than expected.

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