Excavator Production Calculator
Enter bucket capacity, fill factor, cycle time, and job efficiency. Get loose production per hour and optional bank volume after soil swell — for earthwork planning, not a manufacturer guarantee.
Calculate
Calculate
Measurements convert when you switch units
Result
The formula
Hourly loose production is bucket capacity × fill factor × cycles per hour × operating efficiency. Cycles per hour equal 3,600 ÷ cycle time in seconds. Bank (in-situ) volume divides loose output by (1 + swell fraction) so you can compare trench or cut quantities to trucked loose yards.
Worked example
- Bucket 1.2 m³ · fill 90% · cycle 25 s · efficiency 75% · swell 25%
- Cycles/h = 3600 ÷ 25 = 144 · Q_loose = 1.2 × 0.90 × 144 × 0.75 = 116.64 m³/h
- Q_bank = 116.64 ÷ 1.25 = 93.31 m³/h
Result: ≈ 116.6 m³/h loose · ≈ 93.3 m³/h bank
How excavator production is estimated
This is the classic cycle-based earthmoving estimate used in construction planning. Real output swings with operator skill, digging depth, swing angle, haul distance, and ground conditions.
Bucket capacity and fill factor
Use the heaped (or struck) rating that matches how you load. Fill factor accounts for material that does not pile to the theoretical heap — sticky clay may run 80–95%, blasted rock often much lower.
Cycle time and efficiency
Cycle time is dig → swing → dump → return. Shorter swings and shallow cuts cut seconds. Operating efficiency is the share of the hour actually cycling (breaks, trucks waiting, repositioning) — 45–50 minutes per hour (≈ 75–83%) is a common planning band.
Loose vs bank volume
Soil swells when excavated. Swell factor S converts loose production to bank (in-place) volume: bank = loose ÷ (1+S). Match truck capacities (usually loose) to excavation pay quantities (often bank).
What we do not model
No truck fleet matching, gradeability, underwater digging, or OEM production charts. For bid-critical work, calibrate against time studies on your soil and machine class.
Interesting facts
Swing angle eats seconds
A 90° swing is often much faster than 180°. Shaving a few seconds off each cycle compounds into tens of cubic metres per hour on a long shift.
Fill factor is not capacity
A 1.5 m³ bucket at 70% fill moves like a 1.05 m³ bucket. Rock and roots punish optimistic fill assumptions.
Bank vs truck tickets
Pay quantities are often bank cubic metres; trucks haul loose. Mixing the two without swell correction is a classic estimating error.
Efficiency beats bigger buckets
Waiting on trucks or poor staging can drop a large excavator below a smaller machine that cycles steadily.
Frequently asked questions
Multiply bucket volume by fill factor, cycles per hour (3,600 ÷ cycle seconds), and operating efficiency. Optionally divide by (1 + swell) for bank volume.
Often roughly 15–30 seconds for short-swing truck loading; deeper digs, long swings, or confined sites run longer. Time a few real cycles on your job.
Common planning ranges: ~90–100% for easy free-flowing soil, ~80–90% for average earth, much lower for rock or poorly blasted material. Match the material, not the brochure.
Bank is in-place undisturbed volume. Loose is after excavation (swollen). Trucks usually measure loose; excavation quantities are often bank.
No — OEM charts fold in machine class and idealized conditions. Use this for quick what-ifs, then verify with manufacturer data and field studies.
Toggle units for cubic metres vs cubic yards. Cycle time stays in seconds; fill, efficiency, and swell stay percentages.
References
- Caterpillar Performance Handbook (earthmoving production concepts) Industry reference for cycle-based production estimating concepts.
- RSMeans / construction cost data — excavating productivity context Commercial estimating data framing for excavation productivity.
- OSHA excavation safety (planning context) Safety requirements around excavation work — separate from production math.