How to load 405 lb on a barbell
405 lb is “four plates” – four 45 lb plates per side on the standard bar, an aspirational deadlift and squat number. At this load the bar visibly bends and plate seating matters: biggest plates innermost, collars on. Nobody hits 405 cold, so treat the ladder below as the minimum ramp and add singles near the top as needed.
Four 45 lb plates a side is a nearly full standard sleeve, near the practical limit of a 45 lb bar before a dedicated deadlift bar makes more sense. The bar bows noticeably off the floor; that flex is real and normal, not a sign of a bad bar. In kilos 405 is about 184 kg, so the equivalent metric milestone is the 180–185 kg range.
Tap the number to type any weight
- 4 × 45
Warm-up ladder
Other loads
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One tap from your Home Screen, loads instantly, works with zero signal. No app store, nothing to update – it just lives on your phone like any other app. 📲
On iPhone & iPad
1.Open this page in Safari or Chrome and tap the Share button – the square with the arrow (bottom bar in Safari, top right in Chrome).
2.Scroll down the share sheet and tap “Add to Home Screen”.
3.Tap Add. The Plates Calc icon lands on your Home Screen and opens full-screen, even with no signal.
On Android (Chrome)
1.Open this page in Chrome and tap the ⋮ menu, top right.
2.Tap “Add to Home screen” (on some phones it says “Install app”).
3.Confirm. The icon lands on your Home Screen and works offline from then on.
Want a mobile app?
The Home Screen version above already covers most of it. But if enough lifters want a real App Store / Play Store app, I'll build one. Leave your email and tell me honestly whether it'd be worth a few dollars to you – that's what decides it.
How barbell plate math works
Barbell math is simple arithmetic that's surprisingly easy to get wrong under fatigue. Take your target weight, subtract the bar (20 kg or 45 lb for a standard Olympic bar, 15 kg or 35 lb for a women's bar), then split what's left evenly between the two ends. Whatever plates you load on the left must be mirrored exactly on the right. That's all a plate racking calculator does – instantly, without the mid-session mental math. Some lifters call it plate math, others barbell math; either way, a good barbell loader does it in one tap, so you know the bar is loaded right before you get under it. 🏋️ If you think in gym shorthand, my "how many plates" chart translates one to seven plates a side into real numbers.
Competition kg plates follow the IWF color standard – 25 kg red, 20 kg blue, 15 kg yellow, 10 kg green – so an experienced eye reads the load by color alone. Load biggest-plate-innermost so the sleeve seats cleanly and the bar stays balanced. The math is the same whether you run calibrated competition discs or a mixed bag of iron.
Where most calculators fall down is assuming you own a perfect plate set. Real garage gyms are a patchwork of hand-me-down and second-hand plates. Plates Calc solves your target against the plates you actually own, uses fractional micro-plates for exact small jumps, and shows the closest achievable weight when an exact load is impossible.
It works as a gym calculator for any lift: each milestone page doubles as a warm-up calculator with a ready-made ramp up to your top set, and the whole thing runs as an offline barbell loader you can add to your phone's Home Screen – no sign-up, no connection needed.
FAQ
- How does a barbell plate calculator work?
- It subtracts the bar weight from your target, halves the remainder for one side of the bar, then finds the plates that add up to that per-side weight, mirrored on both ends.
- Does it work with a limited or mismatched plate set?
- Yes. Tell it how many pairs of each plate you own and it solves your target using only those plates, and shows the closest weight you can actually load when the exact number isn't possible.
- Does it support fractional or micro plates?
- Yes. It handles fractional plates down to 0.25 kg or 0.25 lb, so you can hit exact targets like 62.5 kg for small progressions.
- Does it work offline?
- Yes. Add Plates Calc to your Home Screen and it opens and calculates with no connection at all – basement gyms included.
- How much weight is 'two plates' or 'three plates'?
- In US gyms a 'plate' means one 45 lb plate per side of a 45 lb bar: two plates = 225 lb, three = 315 lb, four = 405 lb. Counting 20 kg plates on a 20 kg bar: two plates = 100 kg, three = 140 kg, four = 180 kg.
About
Hi, I'm Marina 👋
As a tech-girlie I genuinely love creating (wellness) products that solve real problems – and loading a barbell with a mismatched set of plates shouldn't take mental arithmetic mid-session. That's Plates Calc. If it saved you some fumbling, a coffee is always appreciated. It helps keep Plates Calc free and completely ad-free.
Dedicated to my dear friend Heidi, who just opened her own CrossFit box, CrossFit Elbwerk. Girls support girls. 💖