Skip to main content
CalcPro

Point Load Strength Index (I_s(50)) to Uniaxial Compressive Strength (UCS) Calculator

Easily calculate and compute point load strength index (i_s(50)) to uniaxial compressive strength (ucs) calculator with accurate equations, live formulas, and expert guidance.

Breaking load recorded on field hydraulic ram.

Platen separation distance at failure (standard NX core = 50 mm / 54 mm).

ISRM recommended standard K ≈ 20 to 25 (typically 24 for 50 mm core).

Calculated Result
120 MPa

Estimated UCS

Estimated UCS

120 MPa

Estimated Ucs Mpa

120

Point Load Strength Index Is50 Mpa

5

Size Correction Factor F

1

Isrm Rock Classification

Very Strong Rock (e.g. granite, dense gneiss)

120 — MPa

Calculation Breakdown

  1. Applied FormulaConverts field Point Load Test breaking loads into standard size-corrected Point Load Index (I_s(50)) and estimates Uniaxial Compressive Strength (UCS in MPa).I_{s(50)} = \left(\frac{D}{50}\right)^{0.45} \frac{P}{D^2}, \quad \sigma_c = K \cdot I_{s(50)}

Point Load to UCS Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.0306090120Estimated UCS

What Is the Point Load Strength Index (I_s(50)) to Uniaxial Compressive Strength (UCS) Calculator?

This tool computes point load strength index (i_s(50)) to uniaxial compressive strength (ucs) calculator with high precision arithmetic.

How Does the Point Load Strength Index (I_s(50)) to Uniaxial Compressive Strength (UCS) Calculator Work?

Converts field Point Load Test breaking loads into standard size-corrected Point Load Index (I_s(50)) and estimates Uniaxial Compressive Strength (UCS in MPa).

Point Load Strength Index (I_s(50)) to Uniaxial Compressive Strength (UCS) Calculator Formula & Variables

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

Is(50)=(D50)0.45PD2,σc=K⋅Is(50)I_{s(50)} = \left(\frac{D}{50}\right)^{0.45} \frac{P}{D^2}, \quad \sigma_c = K \cdot I_{s(50)}

Converts field Point Load Test breaking loads into standard size-corrected Point Load Index (I_s(50)) and estimates Uniaxial Compressive Strength (UCS in MPa).

How to Use the Point Load Strength Index (I_s(50)) to Uniaxial Compressive Strength (UCS) Calculator

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

Step-by-Step Example Calculation

Point Load Strength Index (I_s(50)) to Uniaxial Compressive Strength (UCS) Calculator Example

Input Values:

failureLoadKiloNewtons:12.5
coreDiameterMm:50
conversionFactorK:24
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required MPa.

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.

\n

Related Calculators

Explore more tools and calculators in Construction Calculators

Length Converter

Convert length and distance between metric and imperial units including meters, feet, inches, kilometers, miles, and yards with exact SI definitions.

Percentage Calculator

Calculate percentages: what % X is of Y, P% of X, % change, discount price, and percentage points.

Temperature Converter

Convert temperatures between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) with step-by-step thermodynamic formulas.

Rankine Lateral Earth Pressure (Active & Passive) Calculator

Calculates Rankine active and passive lateral earth pressure coefficients, resultant thrust forces, and overturning moments on retaining walls.

Terzaghi Shallow Foundation Bearing Capacity Calculator

Calculates ultimate and allowable bearing capacity for shallow continuous strip and square footings using Terzaghi theory.

Culmann Slope Stability Planar Wedge Calculator

Evaluates critical slope failure height, planar sliding wedge angle, and safety factor against embankment landslides using Culmann method.