Steel/TMT Calculator

Estimate steel or TMT bar weight from diameter, length and quantity. Enter your own values below to see total steel weight and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Mass = π/4 × diameter² × length × bar count × density, with diameter converted to metres.

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What is Steel/TMT Calculator?

Steel/TMT Calculator helps you estimate steel or TMT bar weight from diameter, length and quantity.

The main result is total steel weight. The formula, example and assumptions below explain how to interpret it.

How to use Steel/TMT Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather bar diameter (mm), length of each bar (m), number of bars and steel density (kg/m³). Use values from the same situation or reporting period.
  2. Replace the example bar diameter with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read total steel weight. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter bar diameter in mm, at least 1 and at most 100. Decimals are accepted.
  • Enter length of each bar in m, at least 0.001. Decimals are accepted.
  • Enter number of bars, at least 1 and at most 10000. Use a whole number.
  • Enter steel density in kg/m³, at least 1. Decimals are accepted.

Steel/TMT Calculator: a worked example

With the inputs below, the result is 213.07538 kg (total steel weight). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Bar diameter (mm)12 mm
Length of each bar (m)12 m
Number of bars20
Steel density (kg/m³)7,850 kg/m³
Total steel weight213.07538 kg

Understanding the Steel/TMT result

The main output is total steel weight, expressed in kg. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Steel/TMT Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Keep dimensions in the displayed units and distinguish usable area from built-up area. Material estimates need a suitable allowance for site conditions and waste.

For wider guidance, visit Bureau of Indian Standards. The formula and scope of this specific tool are stated on this page.

Steel/TMT Calculator FAQs

What does Steel/TMT Calculator calculate?

Steel/TMT Calculator helps you estimate steel or TMT bar weight from diameter, length and quantity. Its main output is total steel weight in kg.

What inputs do I need for Steel/TMT Calculator?

You need bar diameter (mm), length of each bar (m), number of bars and steel density (kg/m³). Use the field labels and units to match your figures to the formula.

Which formula does Steel/TMT Calculator use?

Mass = π/4 × diameter² × length × bar count × density, with diameter converted to metres.

What is a worked example for Steel/TMT Calculator?

Example inputs: Bar diameter: 12 mm; Length of each bar: 12 m; Number of bars: 20; Steel density: 7,850 kg/m³. The result is 213.07538 kg (total steel weight).

How should I enter bar diameter?

Enter bar diameter in mm, at least 1 and at most 100. Decimals are accepted.

How do I choose length of each bar?

Enter length of each bar in m, at least 0.001. Decimals are accepted. The example uses 12 m; replace it if your circumstances differ.

How should I read total steel weight?

The main output is total steel weight, expressed in kg. It applies to the inputs and operation you selected.

Why might my Steel/TMT Calculator result differ from my records?

Keep dimensions in the displayed units and distinguish usable area from built-up area. Material estimates need a suitable allowance for site conditions and waste. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Steel/TMT Calculator?

Yes. Note your first total steel weight, change bar diameter or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Steel/TMT Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.