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Rock Quality Designation (RQD) & Core Recovery Calculator

Easily calculate and compute rock quality designation (rqd) & core recovery calculator with accurate equations, live formulas, and expert guidance.

Sum of sound core pieces 10 cm or greater.

Total length of all core pieces recovered.

Total core barrel advance length.

Calculated Result
72.5 %

RQD

RQD

72.5 %

Rqd Percent

72.5

Total Core Recovery Percent

91

Solid Core Ratio

0.7967032967032966

72.5 — %

Calculation Breakdown

  1. Applied FormulaCalculates Deere (1964) Rock Quality Designation and Total Core Recovery (TCR) from geotechnical drill core runs.\text{RQD} = \frac{\sum L_{\ge 10\text{cm}}}{L_{\text{run}}} \times 100\%

RQD Core Recovery Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.018365473RQD

What Is the Rock Quality Designation (RQD) & Core Recovery Calculator?

This tool computes rock quality designation (rqd) & core recovery calculator with high precision arithmetic.

How Does the Rock Quality Designation (RQD) & Core Recovery Calculator Work?

Calculates Deere (1964) Rock Quality Designation and Total Core Recovery (TCR) from geotechnical drill core runs.

Rock Quality Designation (RQD) & Core Recovery Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

RQD=∑L≥10cmLrun×100%\text{RQD} = \frac{\sum L_{\ge 10\text{cm}}}{L_{\text{run}}} \times 100\%

Calculates Deere (1964) Rock Quality Designation and Total Core Recovery (TCR) from geotechnical drill core runs.

How to Use the Rock Quality Designation (RQD) & Core Recovery Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Rock Quality Designation (RQD) & Core Recovery Calculator Example

Input Values:

lengthOver100mmM:1.45
totalCoreRecoveredM:1.82
totalDrillRunM:2
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required %.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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