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Steel TMT Bar Calculator

TMT Bar Diameter

Selected: 12mm TMT Bar

Slabs, beams, columns

Weight: 0.888 kg per meter

Bar Length

Length (feet)

Number of Bars

Total: 10 bars × 12 feet

12mm diameter TMT bars

Total Length

Meters

36.58 m

Feet

120 ft

Per Bar Length

12 feet each

Weight Calculation

Weight per Meter

0.889 kg/m

Total Weight (kg)

32.51 kg

Total Weight (Tons)

0.033 tons

Cost Estimation

Estimated Total Cost

₹2,114

@ ₹65 per kg (average market rate)

Cost per bar: ₹211.4

Quick Summary

Bar Diameter:12mm TMT

Length per Bar:12 feet

Number of Bars:10 bars

Total Length:36.58 m

Total Weight:32.51 kg

Total Cost:₹2,114

Steel Requirements Breakdown

Proportional representation of steel requirements

How Steel TMT Calculation Works

Weight Calculation Formula

TMT bar weight is calculated using the standard formula: Weight = (D² ÷ 162) × Lwhere D = diameter in mm, L = length in meters.

Weight per meter = (12² ÷ 162) = 0.889 kg/m

Total weight = 0.889 kg/m × 36.58 m = 32.51 kg

Length Calculation

Total length is calculated by multiplying individual bar length with number of bars.

Per bar: 12 feet

Total bars: 10

Total length: 10 × 12 feet = 36.58 meters

Cost Estimation

Cost is estimated at ₹65 per kg (average market rate in India). Actual prices vary by brand, grade, and location.

32.51 kg × ₹65/kg = ₹2,114

TMT Bar Weight Standards

8mm

0.395 kg/m

10mm

0.617 kg/m

12mm

0.888 kg/m

16mm

1.58 kg/m

20mm

2.469 kg/m

25mm

3.854 kg/m

32mm

6.313 kg/m

Pro Tips for TMT Steel

Bar Selection Guide:

• 8mm & 10mm: Stirrups, ties, secondary reinforcement
• 12mm: Most common for slabs, small beams
• 16mm & 20mm: Main reinforcement in beams/columns
• 25mm & 32mm: Heavy structural elements

Practical Considerations:

• Add 2-5% extra for cutting waste
• Standard lengths: 12m (40 feet) in India
• Check ISI mark for quality assurance
• Consider transportation and handling costs

Current Calculation Summary:

Diameter: 12mm TMT

Length per bar: 12 feet

Number of bars: 10

Total length: 36.58 m

Total weight: 32.51 kg

Estimated cost: ₹2,114

About This Steel TMT Bar Calculator

This calculator helps civil engineers, contractors, and homeowners estimate the weight and cost of TMT reinforcement steel bars used in RCC construction. Select a standard bar diameter, enter the bar length and quantity, and get an instant weight and cost estimate using the industry-standard steel weight formula.

Steel TMT Bar Calculator FAQs

What is the formula for TMT bar weight?

Weight per meter (kg/m) = diameter² ÷ 162, a standard formula used across the Indian steel industry; this is multiplied by total bar length to get total weight.

Which bar diameter should I use for which purpose?

8mm and 10mm bars suit stirrups and light reinforcement, 12mm is common for slabs, 16mm and 20mm are used as main reinforcement in beams and columns, and 25mm/32mm suit heavy structural elements.

What is the standard length of a TMT bar in India?

TMT bars are typically supplied in 12-meter (about 40 feet) standard lengths, which this calculator supports alongside custom lengths.

What cost rate is used for the steel estimate?

The calculator assumes an average market rate of ₹65 per kg — actual prices vary by brand, grade (Fe500/Fe550), and local market conditions.

Should I add extra steel for cutting waste?

Yes, typically 2-5% extra is recommended to account for cutting waste and overlaps during reinforcement work.