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Excavation volume calculator

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  • Failure to adhere to the safe slope ratio (gradient] for each soil type poses a high risk of excavation surface collapse, so please be sure to check the actual ground conditions at the site and enter the slope value.
  • Since the excavated soil undergoes a change in volume rate (L value] due to the air layer, more dump trucks are required for transportation than calculated based on natural conditions.
  • To ensure that the calculation matches the actual amount of soil to be excavated, you must add a margin of at least 50cm to 1m beyond the outer edge of the foundation to allow for formwork installation and securing a passage for workers.
  • Please note that if the excavation depth is 1.5m or more, construction must be carried out after establishing separate safety reinforcement measures, such as temporary earth retaining structures, to ensure worker safety.
  • If you confuse the actual measurement unit (mm/m], the calculation result may differ by more than 1,000 times, so please carefully check the selected unit next to the input field once again.

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Excavation Calculator, Soil Volume Calculation and Excavated Soil Disposal Cubic Meter (㎥] Guide

Excavation marks the beginning of construction or civil engineering projects. While it may appear to be a simple act of digging, failure to consider the safety slope and work clearance based on soil type can lead to collapse accidents. Furthermore, since excavated soil undergoes a rate of change in volume due to the formation of air pockets, the actual volume of soil to be excavated (cubic meters] and the dump truck dispatch plan must be precisely calculated taking this into account.

Excavation and Soil Volume Calculation Formulas

Excavation volume is not a simple rectangular prism. To ensure accuracy, a volume formula in the shape of a truncated square must be used, taking into account the slope gradient for collapse prevention and the clearance for floor work.

1. Calculation of Excavation Volume (Natural Condition]
Excavation Volume = Depth / 6 × {(2 × Bottom Width + Top Width] × Bottom Length + (2 × Top Width + Bottom Width] × Top Length}
2. Reflection of Soil Volume Change Rate (L] (Transport Status]
Volume during transport = Volume in natural state × L (Soil volume conversion factor]

When compacted soil is excavated, its volume increases. Typically, dump truck volumes are calculated by applying L=1.2–1.3 for general soil and L=1.5 or more for bedrock.

Detailed description of calculator input items

Please enter values ​​appropriate for the site conditions to accurately calculate the soil quantity.

  • 1. Pit width/length

    These are the width and length dimensions of the foundation floor area where the actual structure will sit.

  • 2. Depth of the pit

    This is the vertical depth (height] to be excavated from the ground surface (G.L] to the bottom surface (E.L].

  • 3. Soil Selection

    When you select the type of soil at the site (sand, clay, bedrock, etc.], the standard soil volume change rate (L value] is automatically applied.

  • 4. Slope ratio 1:N

    This is the slope gradient for preventing collapse. (e.g., 1:0.5 means retreating 0.5m horizontally for every 1m dug vertically]

  • 5. Clearance

    It is the width of the excavation extending beyond the structural foundation line to allow for formwork assembly or worker movement passages.

Standard Specifications for Safe Slope and Soil Volume Change Rate by Soil Type

These are the recommended values ​​for each ground type according to the Standard Cost Estimation for Construction Works and the Industrial Safety and Health Standards.

Soil classification Recommended slope (1:N] Soil volume change rate (L] Remarks (Field Terms]
Sand 1 : 1.5 digging.table.more 1.1 ~ 1.2 High risk of collapse, gentle slope
Ordinary soil (moist] 1 : 1.0 ~ 1.2 1.2 ~ 1.3 General country house foundation
Ordinary soil (dry] 1 : 0.5 ~ 1.0 1.2 ~ 1.3 hard ground
weathered rock 1 : 0.8 1.3 ~ 1.4 Rock crushing required
Gyeongam (Rock] 1 : 0.3 1.5 ~ 1.6 Blasting or breaker work

Essential Checklist for Fail-Free Construction

Here are tips to prevent common mistakes and safety accidents on site.

  • Work clearance is essential

    Do not dig exactly to the size of the foundation; secure a clearance of at least 50cm to 1m for formwork installation.

  • Check the laser level frequently

    If you rely on the equipment operator's intuition, the level may not be correct. Digging too deep will result in high concrete costs.

  • Considering the reality of truck payloads

    The cargo bed of a 15-ton dump truck holds 10 cubic meters, but it is often loaded with only 8 to 9 cubic meters, so please allocate about 10% extra.

  • Safety First and Unit Attention

    For depths of 1.5m or more, a review of temporary earth retaining structures is required. Please be sure to check the m and mm units when entering data.

Frequently Asked Questions (FAQ]

  • Q. How much soil can be loaded into a 15-ton dump truck?
  • A. It is approximately 10 cubic meters in volume and about 15 tons in weight. Wet soil or rock may be less than this.
  • Q. What is 'Satojang'?
  • A. This is a disposal site for excavated soil. If you arrange it in advance, you can reduce transportation and disposal costs.
  • Q. What does a slope ratio of 1:N mean?
  • A. It means to dig by spreading outward horizontally by N meters for every 1 meter you go down vertically. The larger the number, the safer it is.