The calculation
exercise volume load = sets × repetitions × external loadsession volume load = sum of all exercise rowsWorked session example
| Exercise | Sets | Reps | Load | Volume load |
|---|---|---|---|---|
| Back squat | 3 | 8 | 80 kg | 1,920 kg |
| Bench press | 4 | 6 | 70 kg | 1,680 kg |
| Romanian deadlift | 3 | 10 | 60 kg | 1,800 kg |
| Session total | 5,400 kg | |||
Comparing sessions
If a previous comparable session totalled 5,000 kg, the change is (5,400 − 5,000) ÷ 5,000 × 100 = 8%. The percentage is descriptive. It does not automatically mean the workout was 8% more effective or that an 8% increase was appropriate.
Calculate exercise and session tonnage, save local history and reload a prior session.
What tonnage captures
- The entered external load
- The number of completed sets and repetitions
- Change in the same calculation across repeated sessions
What tonnage misses
| Missing factor | Why it matters |
|---|---|
| Range of motion and technique | The same load and repetitions can represent different mechanical work and skill demands. |
| Effort / proximity to failure | Ten easy repetitions and ten near-limit repetitions have the same tonnage but different fatigue. |
| Exercise mechanics | A kilogram on one exercise is not directly equivalent to a kilogram on another. |
| Bodyweight contribution | Push-ups, pull-ups and assisted movements need a different convention if they are to be compared. |
| Tempo and rest | Time under tension and recovery can change the session without changing tonnage. |
Best use of the metric
Keep the exercise name, technique and counting convention consistent. Compare the same lift over time, use the local history as a log rather than a performance verdict, and combine tonnage with repetitions, load, perceived effort and qualitative notes. Current research uses several volume definitions—including number of sets and sets × reps × load—because no single measure captures every adaptation.
Units and conversions
Do not compare kilogram and pound session totals without conversion. A pound total will be numerically larger even when the physical load is the same. ToolBullet stores the selected unit with each local session.
Progress without chasing the largest number
Volume can rise by adding load, repetitions or sets, but each change has a different cost. A gradual increase that preserves technique and recovery is not equivalent to a sudden jump created by adding low-quality work. Compare rolling patterns rather than reacting to one session, and note planned deloads or exercise substitutions so that a lower total is not misread as failure. Where a programme uses “hard sets” rather than tonnage as its primary volume measure, record both instead of forcing every decision into one number.
Consistent counting conventions
Decide whether unilateral exercises are recorded per side or as a combined total, whether dumbbell load means one implement or both, and whether warm-up sets are included. ToolBullet calculates exactly what is entered; it cannot infer the convention. A clear convention makes local history useful and makes exported summaries understandable months later.
How it works and sources
Method and sources reviewed 7 July 2026. ToolBullet uses these sources to explain the method and its limits; it does not replace coaching, medical advice or official governing-body records.