Barbell Plate Calculator
Plates per side for any barbell target in kg or lb.
What it does
Barbell loading is subtraction then greedy change making: remove the bar from the target, halve the rest per side, then stack the biggest plates first. Standard plate sets cover nearly every target exactly because denominations nest.
The tool above takes target, bar, and unit. It returns weight per side, the plate stack inward out, and whether the load lands exact.
Plate order matters for safety and feel. Heavy plates sit against the sleeve collar area first with lighter change outside, which keeps the bar whip predictable and plates from rattling.
Collars weigh a little and count in competition. Training with clips while planning with bare math misses half a kilo or a pound per side, which matters at percentages.
How to use
- Pick kg or lb to match the plates on the rack.
- Enter the total target including the bar.
- Enter the actual bar weight from its end cap.
- Load the listed stack heaviest inward and clip up.
Formula
- target - bar
- Plate weight total, split equally both sides.
- greedy fill
- Largest plate fitting the rest, repeated. Standard sets nest exactly.
Odd change needs small plates: 1.25 kg or 2.5 lb pairs cover most remainders. Fractional plates below that fine tune percentages.
Worked example
Example: 100 kg with a 20 kg bar
Target 100 kg, Olympic bar 20 kg.
- Plates total: 100 - 20 = 80 kg.
- Per side: 80 / 2 = 40 kg.
- Greedy: 25 fits, leaving 15. Then 15 fits, leaving 0.
- Load: 25 + 15 each side. Exact 100 kg.
Reference table
| Target | Per side | Plates |
|---|---|---|
| 60 kg | 20 kg | 20 |
| 80 kg | 30 kg | 25 + 5 |
| 100 kg | 40 kg | 25 + 15 |
| 120 kg | 50 kg | 25 + 25 |
| 140 kg | 60 kg | 25 + 25 + 10 |
Limits
- Standard plate sets assumed. Odd gyms lack change plates.
- Collars excluded from the math.
- Bar weight must be known and entered.
- Specialty bars and axles differ.
Common mistakes
- Forgetting the bar in the total.
- Loading light plates inward, which rattles.
- Skipping collars on heavy sets.
- Mixing kg and lb plates on one bar.
- Rounding targets instead of loading exact.
Try it yourself
Quick checks. Answers sit tucked under each question.
60 kg with a 20 kg bar?
40 / 2 = 20 kg per side. One 20 plate each side.
225 lb with a 45 lb bar?
180 / 2 = 90 per side. Then 45 + 45 each side.
Questions
How much does an Olympic bar weigh?
Twenty kilos for men, fifteen for women. Standard US bars run 45 lb.
Which plate goes on first?
Heaviest inward. It stabilizes the load and protects light plates.
Do collars count?
Yes, roughly half a kilo or a pound per pair. Count them near max attempts.
What if the target will not load exact?
The tool shows the closest stack. Add fractional change or adjust the target.
Can I mix kg and lb plates?
Avoid it. Mixed math invites loading errors under fatigue.
Why greedy order works?
Standard denominations are canonical: biggest first always reaches the fewest plates.