Question 1

What is kg per meter?

Accepted Answer

Kg per meter (kg/m) is the weight of one meter of rebar for a given diameter. It's a standard value used in construction to calculate total weight from length. For example, 12 mm rebar weighs 0.888 kg per meter, meaning every meter of 12 mm rebar weighs 0.888 kg. This value is based on steel density and is standardized across the industry.

Question 2

Why weight differs by diameter?

Accepted Answer

Weight differs by diameter because larger diameter bars have more steel volume per meter. Weight is proportional to cross-sectional area, which increases with the square of diameter. For example: 10 mm bar has area π × (5 mm)², while 16 mm bar has area π × (8 mm)² - the 16 mm bar has 2.56× more area and thus 2.56× more weight per meter. Larger diameters are heavier but also stronger.

Question 3

Is this exact?

Accepted Answer

These values are typical approximations used in practice. Actual weights may vary slightly by: manufacturer specifications, rebar grade (though grade doesn't affect weight for same diameter), and manufacturing tolerances. The values are based on standard steel density (7850 kg/m³) and are accurate enough for estimation, planning, and material ordering. For precise calculations, check manufacturer specifications.

Question 4

Can I use this for steel wire?

Accepted Answer

This calculator is designed for rebar (reinforcement bars), which are typically 6-20 mm diameter. Steel wire may have different specifications and weights. However, if the wire diameter matches rebar diameters (6-20 mm), you can use this calculator as an approximation. For other wire sizes or types, use the formula: Weight = Length × (π × (diameter/2)² × density), where density is typically 7850 kg/m³ for steel.

Question 5

How to estimate for a project?

Accepted Answer

To estimate rebar for a project: 1) Calculate total rebar length needed (use Rebar Calculator for slabs), 2) Use this calculator to convert length to weight, 3) Add 5% waste margin for overlaps and cuts, 4) Order based on weight. Alternatively, if you know the weight needed, use Weight → Length mode to verify you have enough length. Always consult structural design for actual requirements.

Question 6

What rebar diameters are common?

Accepted Answer

Common rebar diameters: Light reinforcement: 6-8 mm. Standard slabs: 10-12 mm. Heavy slabs/beams: 14-16 mm. Structural elements: 18-20 mm. The calculator supports all standard diameters (6, 8, 10, 12, 14, 16, 18, 20 mm). Choose diameter based on structural design requirements - larger diameters provide more strength but cost more.

Question 7

How do I measure rebar length?

Accepted Answer

Measure rebar length: For straight bars: measure from end to end. For bent bars: measure along the bar (not straight-line distance). Standard rebar lengths: 12 meters (most common), 6 meters, or custom lengths. When calculating total length for a project, account for overlaps and splices (typically 40-50× bar diameter). Use the Rebar Calculator for slab reinforcement calculations.

Question 8

What about rebar grade?

Accepted Answer

Rebar grade (e.g., Grade 60, Grade 40) affects strength and yield point but not weight. For the same diameter, different grades have the same weight per meter. This calculator estimates weight only - grade selection is a structural design decision based on strength requirements. Always use the rebar grade specified in structural design.

Question 9

Can I calculate for multiple diameters?

Accepted Answer

This calculator handles one diameter at a time. For projects with multiple diameters: calculate each diameter separately, then add the weights together. For example, if you need 100 m of 10 mm and 200 m of 12 mm: calculate 10 mm separately (61.7 kg), calculate 12 mm separately (177.6 kg), then add: 61.7 + 177.6 = 239.3 kg total.

Question 10

What if I have imperial units?

Accepted Answer

This calculator uses metric units (meters, kilograms, millimeters). For imperial: convert first - 1 ft = 0.3048 m, 1 lb = 0.4536 kg, 1 inch = 25.4 mm. For example, 100 feet = 30.48 meters, 1000 lbs = 453.6 kg. The calculator will work with converted values. Future versions may include direct imperial unit support.

Question 11

How accurate is the weight table?

Accepted Answer

The weight table uses standard values based on steel density (7850 kg/m³) and is accurate for estimation purposes. Actual weights may vary by ±2-3% due to manufacturing tolerances. For precise calculations, check manufacturer specifications or measure actual samples. The values are industry-standard approximations used in construction practice.

Question 12

What about rebar coatings?

Accepted Answer

This calculator calculates bare steel weight. Epoxy-coated or galvanized rebar may have slightly different weights due to coating, but the difference is typically less than 1-2% and is usually negligible for estimation. For precise calculations with coated rebar, check manufacturer specifications. The calculator provides bare steel weight, which is standard for material ordering.

Question 13

Can I use this for rebar mesh?

Accepted Answer

This calculator is designed for individual rebar bars. Rebar mesh (welded wire mesh) has different specifications: mesh size, wire diameter, and spacing. For mesh, calculate based on total wire length in the mesh, or use mesh-specific calculators if available. This calculator works for individual bars or can approximate mesh if you know the total wire length.

Question 14

How to verify a delivery?

Accepted Answer

To verify a rebar delivery: 1) Count the number of bars and measure length of a sample, 2) Use Length → Weight mode to calculate expected weight, 3) Compare with delivery weight. Or: 1) Weigh the delivery, 2) Use Weight → Length mode to calculate expected length, 3) Compare with delivery length. Small differences (2-3%) are normal due to manufacturing tolerances.

Question 15

What about rebar bends?

Accepted Answer

Rebar bends don't significantly affect weight calculation - weight is based on total bar length, not straight-line distance. For bent bars, measure along the bar (following the curve) to get accurate length. The calculator uses total length, so bends are already accounted for in the length measurement. Weight calculation remains the same regardless of bends.

Rebar Weight Calculator – Weight per Meter and Total Steel Weight

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100m of Ø12 → Weight

500kg of Ø16 → Length

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Rebar Estimation Basics