Weight Unit Converter
Tonnes, kilograms, jin and pounds — every unit at once.
Quick answer
With the default inputs: Value 1 · From unit Tonne · To unit KilogramConverted value 1000.00 kg
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Result
Converted value
1000.00kg
| Kilogram | 1000.00kg |
| Gram | 1000000.00g |
| Tonne | 1t |
| Jin | 2000.00jin |
| Liang | 20000.00liang |
| Pound | 2204.62lb |
| Ounce | 35273.99oz |
| Long ton | 0.984204long tn |
| Short ton | 1.1023short tn |
| Quintal | 10q |
Engineering quantities use kilograms and tonnes. Chinese units such as jin and liang appear only in small trades and never in structural or settlement documents.
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Formula
| Metric | 1 t = 1000 kg = 1 000 000 g, 1 q = 100 kg |
| Chinese | 1 jin = 500 g, 1 liang = 50 g, 10 liang to a jin |
| Imperial | 1 lb = 16 oz = 0.453592 kg |
| Three tons | metric 1000 kg, long 1016.05 kg, short 907.18 kg |
| Densities | concrete 2.4 t/m³, sand and gravel 1.5 t/m³, steel 7.85 t/m³ |
1000 kg is 1 tonne, 2000 jin or 2204.62 lb. A 30 t load of gravel is about 20 m³ at 1.5 t/m³ — plan loads by weight, not by volume.
Material densities and mass per cubic metre
| Material | Density | Mass per m³ | Note |
|---|---|---|---|
| Water | 1000 kg/m³ | 1.00 t | At 4°C |
| Plain concrete | 2400 kg/m³ | 2.40 t | C20-C40 |
| Reinforced concrete | 2500 kg/m³ | 2.50 t | 100-200 kg/m³ of steel |
| Cement mortar | 2000 kg/m³ | 2.00 t | 1:3 mix |
| Medium sand (loose) | 1500 kg/m³ | 1.50 t | Dry |
| Crushed stone (loose) | 1500 kg/m³ | 1.50 t | 5-25 mm |
| Clay brick | 1800 kg/m³ | 1.80 t | 240×115×53 |
| Steel | 7850 kg/m³ | 7.85 t | Carbon steel |
| Pine (air dry) | 500 kg/m³ | 0.50 t | 12-15% moisture |
| AAC | 600 kg/m³ | 0.60 t | Grade B06 |
How to work it out
- Metric: 1 t = 1000 kg = 1,000,000 g, and 1 quintal (q) = 100 kg. Steel, cement and aggregate are traded by the tonne in construction.
- Chinese municipal units: 1 jin = 500 g, 1 liang = 50 g, ten liang to the jin. Markets and legacy material lists use these, and 1 tonne is 2000 jin.
- Imperial: 1 lb = 16 oz = 0.453592 kg, and 1 oz = 28.3495 g. Imperial drawings sometimes give reinforcement rates and loads in lb and psf.
- Three tonnes must be distinguished: the metric tonne at 1000 kg, the long ton at 1016.05 kg, and the short ton at 907.18 kg — roughly 10% apart, the classic trap in imported equipment and scrap pricing.
- Densities worth knowing: concrete 2.4 t/m³ (reinforced 2.5), sand 1.5, crushed stone 1.5-1.6, steel 7.85, water 1.0, loose cement 1.3, lime 1.2.
- Check: 1 t is about 2205 lb, and 1 jin is 0.5 kg. A wrong order means the wrong ton.
Where it goes wrong
- Treating a short ton as a metric tonne. At 907 kg it is 9.3% lighter, so equipment rated in short tons and read as metric understates lifting load by nearly a tenth.
- Misremembering rebar unit weight. φ20 deformed bar is 2.47 kg/m — not 2.0 and not 3.0 — while φ12 is 0.888 and φ25 is 3.85. One wrong size corrupts the whole schedule.
- Mixing jin and kilogram. A quote of 3 CNY per jin is 6 CNY/kg, not 3, and this is the commonest error on purchase orders.
- Multiplying bulk volume by density without allowing for voids. Loose aggregate is 30-40% voids, so 1 m³ of loose stone is only 0.6-0.7 m³ of solid, and back-calculating volume from weight at 1.5 t/m³ drifts.
- Confusing load with mass. kN is force and kg is mass; a 1 t mass produces 9.8 kN of weight. Using 10 kN as an estimate is fine, but kN is not kg.
Material and cost
Steel trades by the tonne at around 4200 CNY, so on a 1000 t project a metric-versus-short-ton confusion is 400,000 CNY. Aggregate priced by weight versus volume differs by about 50%, and that is the item most disputed at settlement.
On site
- Rebar unit weight is d² × 0.00617 with d in millimetres: φ20 gives 400 × 0.00617 = 2.468 kg/m, matching the code table and easy to do mentally on site.
- Know the common sections too: L50×5 angle at 3.77 kg/m, 10# channel at 10.0, 20a I-beam at 27.9, HN400×200 at 66 kg/m.
- Quick pound conversion: 1 kg ≈ 2.2 lb and 1 lb ≈ 0.45 kg. Divide by 2.2 and you are within 1%.
- Check whether delivery weight is gross or net. Steel settles either by weighbridge ticket or by theoretical weight, and the two differ by 3-5% through negative tolerance.
Basis
- GB/T 3100-3102 Quantities and units series
- GB/T 1499.2-2018 Steel for the reinforcement of concrete — hot rolled ribbed bars
- GB 50009-2012 Load code for the design of building structures, annex on self-weight of materials
FAQ
Why is rebar settled by theoretical weight rather than on the scales?
Bar diameters carry a permitted tolerance, so weighing lets negative tolerance cut the real steel area. The standard fixes theoretical mass by nominal diameter (Φ20 = 2.47 kg/m) and settlement uses mass × length. “Non-standard” bar can weigh correctly while being undersized, losing over 10% of capacity.
Is the jin still used in construction?
For sundries and small hardware markets — nails, wire, welding rod — quotes still come by the jin at 500 g, a factor of two from the kilogram, which invites confusion. Contracts and settlements must be in kilograms or tonnes; where a verbal quote is by jin, write the converted mass on the document.
How far apart are long and short tons?
A long ton is 1016.05 kg, a short ton 907.18 kg — 12% apart. On imported equipment, confirm which “ton capacity” is meant; picking the wrong one overloads a crane or truck by 12%, which is a safety issue rather than a rounding error.
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Weight Unit Converter. 2026-10-25. https://jianzhujisuan.com/en/unit-weight
Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.