Plate loading calculator.
Enter a target barbell weight, pick your bar and the plate pairs on your rack, and get exactly which plates go on each side - largest first. If the number cannot be made, you get the closest loadable weight and how far off it is. Works in kilograms and pounds.
load the bar
Plate pairs available
Untick anything your gym does not have. Assumes enough pairs of each ticked size.
- kg
each side of the bar, largest first
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Mirror the same plates on the other sleeve. The visual shows one side only.
the short answer
To load a barbell, use plates per side = (target weight - bar weight) / 2, then stack that amount on each sleeve starting with the heaviest available plate. For 102.5 kg on a 20 kg bar: (102.5 - 20) / 2 = 41.25 kg per side = 25 + 15 + 1.25. If the exact number cannot be made from your plates, load the closest weight at or below the target - this calculator finds it for you and shows the remainder.
How the plate math works.
Every loaded barbell is the bar plus two identical stacks of plates. So the only number that matters is the per-side load: (target - bar) / 2. The calculator then fills that per-side amount from your ticked plate pairs, heaviest plate first - the same way you would load it in the gym, and the way that keeps the biggest plates against the collar.
Greedy loading alone can miss combinations when a rack is incomplete (with only 20s and 15s, a 30 kg side is two 15s, not a 20 that leaves 10 unreachable). So this tool runs an exact search over every combination of your available plates and returns the heaviest loadable weight at or below the target. When your plates cannot make the number, you see the closest achievable weight and the exact remainder, so you can decide whether to round down, grab fractional plates, or adjust the program.
Standard sets are built in: kg pairs of 25, 20, 15, 10, 5, 2.5 and 1.25, and lb pairs of 45, 35, 25, 10, 5 and 2.5, with 20 kg / 45 lb, 15 kg / 35 lb and technique-bar options for the bar itself. A target below the bar weight gets flagged with a suggestion to pick a lighter bar - no bar loads negative plates.
Turning programmed percentages into loadable weights.
Percentage-based programming constantly spits out numbers no plate set can make - 72.5% of a 143 kg squat is 103.7 kg. A coach writing that into a program is really deciding two things: what the client should lift, and what the client CAN load in their gym. Coaches run this calculator against the client's actual rack (tick off what the home gym is missing) and write the closest loadable weight into the program, so the client never stands at the bar doing arithmetic between sets or improvising a load that quietly breaks the intended intensity.
It matters most for remote clients in home and hotel gyms, where the small change plates are usually missing. Knowing the real jumps a client can make - 5 kg instead of 2.5 - changes how you wave the loading across a block, and it is the difference between a program that reads well and one that gets executed as written.
Doing this one lifter at a time in a spreadsheet is the slow way. Inside Coachway, a coach sets the strength target once and the workout builder prescribes each client's working weights off their own numbers - every client, updated at once, logged from their own app - so the coach handles everything around one client from one tab, not six.
If you are programming percentages for a full client list, see how coaches set every target from one place.
No charge today - cancel in 2 clicks.Frequently asked questions.
How do you calculate which plates to put on a barbell?
Subtract the bar weight from the target weight, then divide by two: plates per side = (target - bar) / 2. Load that number onto each sleeve starting with the heaviest plate that fits and working down. For 140 kg on a 20 kg bar: (140 - 20) / 2 = 60 kg per side, which is 25 + 20 + 15.
How much does a standard barbell weigh?
A standard Olympic barbell weighs 20 kg (45 lb, technically 44.1 lb). The most common alternatives are the 15 kg (35 lb) bar and 10 kg or 25 lb technique bars. Always confirm which bar a client is using before loading - a 5 kg difference in bar weight changes every set on the program.
What plates come in a standard kg and lb set?
Standard kg pairs are 25, 20, 15, 10, 5, 2.5 and 1.25 kg. Standard lb pairs are 45, 35, 25, 10, 5 and 2.5 lb. Most commercial gyms carry all of them, but home gyms and hotel gyms often skip the small change plates - untick the pairs that are missing and this calculator works with what is actually on the rack.
What if my target weight cannot be made with my plates?
The calculator falls back to the closest weight you can load at or below the target and tells you the remainder. Loading slightly under is the standard call: percentages are estimates anyway, and a few kilos light never hurt a set the way a missed rep at a too-heavy load does. Fractional plates (0.5-1.25 kg) close the gap if you need exact numbers.
Why do programmed percentages land on weights I cannot load?
Because a percentage of a one rep max is just math - 72.5% of 143 kg is 103.7 kg, and no plate set makes that. Coaches round every programmed load to the nearest loadable weight, usually 2.5 kg or 5 lb jumps. That is exactly what this tool does: it converts an awkward programmed number into the plates that actually go on the bar.
Do I count plates for both sides or one side?
This calculator shows the plates for ONE side - you mirror the same stack on the other sleeve. That matches how lifters load a bar in practice. So "1 x 20 kg, 1 x 10 kg per side" on a 20 kg bar means two 20s and two 10s in total, for a loaded weight of 80 kg.
Plate math assumes standard calibrated pairs - cheap plates can run a few percent off their stamped weight. This tool is general fitness information, not medical advice.
Get the target first with the one rep max calculator or the RPE calculator, then read how coaches turn strength numbers into full programs in our guide to software for strength and conditioning coaches.
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This calculator loads one bar. Coachway lets coaches program percentage-based targets per client and see them logged from each client's own app - built on knowledge from working with 150 online coaches over 6+ years. Start your 14-day free trial: no charge today, cancel in 2 clicks.
