# Concrete Strength Grade Converter

Convert between concrete strength notations: C grade ↔ cube strength fcu ↔ cylinder fck,cyl ↔ prism fck,prism ↔ design value fc. Ratios: fck,cyl = 0.8·fcu, fck,prism = 0.88·0.76·fcu, fc = fck,prism/1.4. Any one input produces all others.

> Canonical page: https://elysiatools.com/en/tools/concrete-strength-grade-converter

- **Category:** Math & Numbers

- **Keywords:** concrete strength, grade conversion, C grade, fcu, fck, cylinder strength, cube strength, prism strength, GB 50010, Eurocode 2, civil engineering

## Overview

The Concrete Strength Grade Converter allows structural engineers and concrete technology specialists to instantly convert between standard concrete strength notations, including C grade, cube strength (fcu), cylinder strength (fck,cyl), prism strength (fck,prism), and design value (fc). By inputting any single known value, the tool automatically calculates the remaining parameters using standard conversion ratios, ensuring quick cross-referencing across different international design codes like GB 50010 and Eurocode 2.

## Inputs

- **Input Type** (select)
- **Value** (number): Numeric value matching the chosen Input Type. For grade, enter the number part (30 = C30).
- **Decimal Places** (number)

## When to use

- When comparing concrete specifications between international design standards like Eurocode 2 (cylinder-based) and GB 50010 (cube/prism-based).
- When calculating the design strength value (fc) from a known characteristic cube or cylinder strength for structural calculations.
- When verifying if non-standard laboratory test results meet the requirements of a specified standard concrete grade.

## How it works

- Select the input type corresponding to your known value: Grade (e.g., C30), Cube Strength (fcu), Cylinder Strength (fck,cyl), or Prism Strength (fck,prism).
- Enter the numeric value of the selected strength parameter and specify the desired decimal precision.
- The tool applies standard conversion formulas, including fck,cyl = 0.8 * fcu, fck,prism = 0.88 * 0.76 * fcu, and fc = fck,prism / 1.4, to output all equivalent values simultaneously.

## Use cases

- Cross-referencing cylinder strength requirements from Eurocode 2 with cube strength specifications in local projects.
- Determining the design compressive strength (fc) for concrete structural member design calculations.
- Converting experimental laboratory cylinder test results to equivalent prism and design values for compliance checks.

## Frequently asked questions

### What formulas are used for the conversions?

The tool uses fck,cyl = 0.8·fcu, fck,prism = 0.88·0.76·fcu, and fc = fck,prism/1.4.

### Can I input a non-standard strength value?

Yes, you can input any numeric value for cube, cylinder, or prism strength, and the tool will calculate the corresponding non-standard equivalents.

### What does the C grade input represent?

The C grade represents the characteristic cube compressive strength (fcu) in MPa (e.g., entering 30 represents C30).

### Which design codes align with these conversion ratios?

These ratios are commonly referenced in Chinese standard GB 50010 and related comparative structural engineering literature.

### How do I adjust the precision of the output values?

You can set the Decimal Places option to any integer between 0 and 6 to control the rounding of the results.

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