Estimate gross calories during active bush trimming or active time for an energy target from body weight and a named trimming or yard-work reference.
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The calculator uses the standard MET (metabolic equivalent) equation to estimate gross energy during active work, including resting metabolism. References come from the 2024 Adult Compendium of Physical Activities for ages 19–59; they are population activity estimates, not measured personal calories.
- Calories = estimated gross kilocalories during active work
- MET = the named trimming or yard-work activity reference
- kg = body weight in kilograms (pounds are converted at 1 lb = 0.45359237 kg)
- minutes = active working time in minutes, excluding breaks (hours are multiplied by 60)
- 3.5 = baseline oxygen uptake in mL/kg/min
- 200 = constant that converts oxygen use to kcal/min
The formula applies a fixed activity reference to active working time. It does not individually adjust for age, sex, body composition, terrain, tool weight, or technique. Subtract breaks from the entered time; energy during breaks is excluded. Gross energy is not extra energy above rest.
The active-time-for-an-energy-target mode rearranges the same formula to solve for active minutes:
The two solve choices share one equation. Energy from active work time multiplies the per-minute reference rate by active minutes. Active time for an energy target divides a gross kcal target by that unrounded rate; breaks add elapsed time. The activity dropdown selects a named reference, not a calibrated trimming intensity ladder. Energy in kJ equals kcal × 4.184.
Reference Tables
Use the first table to select a named task reference. The second table gives rounded gross kcal for 30 active minutes, calculated from the listed pound weights before rounding; displayed kg labels are approximate. Mixed jobs require separate calculations for each task and active duration, rather than a single invented trimming-and-cleanup rate.
| Activity reference | MET | Intensity |
|---|---|---|
| Power cutter, shrubs or trees (08215) | 3.3 | Moderate |
| Manual cutter, shrubs or trees (08210) | 3.8 | Moderate |
| Clearing land / hauling brush, vigorous (08030) | 6.3 | Vigorous |
| General yardwork, vigorous (08262) | 6.0 | Vigorous |
| Body weight | 30 min power trimming (3.3 MET) | 30 min manual trimming (3.8 MET) | 30 min vigorous yardwork (6.0 MET) |
|---|---|---|---|
| 130 lb (59 kg) | 102 kcal | 118 kcal | 186 kcal |
| 160 lb (73 kg) | 126 kcal | 145 kcal | 229 kcal |
| 190 lb (86 kg) | 149 kcal | 172 kcal | 271 kcal |
| 220 lb (100 kg) | 173 kcal | 199 kcal | 314 kcal |
Example and FAQ
Example: You weigh 175 lb and spend 45 active minutes using a manual cutter on shrubs (3.8 MET). Weight is 175 × 0.45359237 = 79.37866475 kg. Rate: 3.8 × 3.5 × 79.37866475 / 200 ≈ 5.28 kcal/min. Calculate with the unrounded rate: 3.8 × 3.5 × 79.37866475 / 200 × 45 ≈ 237.54 kcal, or 993.87 kJ.
Does an electric or gas trimmer burn fewer calories than hand shears? The named source references use 3.3 MET for power cutters and 3.8 MET for manual cutters. This compares activity groups; it does not guarantee a personal difference for every tool, technique, or job. The power-cutter reference also groups moderate leaf-blower and edger work.
Should I include cleanup time? Calculate trimming and cleanup segments separately using a reference that matches each task and its active duration, then add their gross energy estimates. The vigorous hauling-brush reference covers land clearing/hauling only; general vigorous yardwork is a broader group. Neither is a fixed blended trimming-and-cleanup rate. Exclude breaks.
Why are these “Calories” capitalized? One food Calorie equals one kilocalorie (kcal). The formula already produces kcal, so the number you see matches what is on a nutrition label.
How accurate is the result? This is a population estimate, not a precise personal measurement or a guaranteed accuracy range. Actual energy varies with technique, body characteristics, and work conditions. A watch may use different measurements and assumptions; this calculator does not guarantee that either method is more accurate.
Does trimming count as exercise? Using CDC absolute-intensity categories, 3.0–5.9 MET is moderate and at least 6.0 MET is vigorous. These source references fall into those categories, while your relative effort can differ with fitness. The calculator does not measure personal intensity or prescribe a workout.
