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Retaining Wall/Stone Wall Quantity Calculator

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ton/㎥
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Please check.

  • To prevent collapse due to water pressure, at least one drainage hole (water hole] must be installed per 3 to 4 square meters (about 1 pyeong] to ensure structural safety.
  • When measuring the height of a retaining wall, you must include not only the exposed portion above the ground but also the depth of the foundation buried underground to prevent a shortage of concrete.
  • When ordering ready-mix concrete, it is standard practice at construction sites to order about 0.5 to 1.0 cubic meters more than the calculated value to account for formwork displacement or remaining volume in the pump truck pipeline.
  • If the retaining wall thickness is too thin, it is difficult to withstand earth pressure, so a minimum thickness of 200mm or more is recommended for general housing, and for heights of 2m or more, a separate structural review must be conducted.
  • To ensure sufficient strength after pouring, the formwork must be removed after a curing period of at least 3 to 5 days, depending on the temperature, in order to prevent bulging or microcracks.

How about this calculator?

Retaining Wall/Stone Wall Calculator, Concrete Cubic Meters (㎥] and Ready-Mix Concrete Quantity Calculation Guide

Use this calculator to handle everything from cubic meter (㎥] calculations to ready-mix concrete dispatch quantities and unit weights.

Retaining Wall/Stone Wall Volume Calculation Formula

This is a method of calculating 'Lube', a term used in the field to denote volume (㎥].

Calculation of structure volume and weight
Volume (㎥] = Length × Height × Thickness / Total Weight = Volume × Unit Weight × (1 + Markup Rate / 100]
Number of ready-mix concrete trucks needed
Number of units required = Total volume (㎥] ÷ 6 (based on 6㎥/unit]

Note: If the calculation result is 1.1 units, you must order 2 units. It is recommended to plan in advance to use the leftover concrete for parking lot floors or leftover paving sections.

Detailed Guide to Calculator Input Items

Please prepare design drawings or on-site measurement data for accurate calculations.

  • 1. Retaining wall length

    Enter the total width of the retaining wall to be constructed.

  • 2. Retaining wall height

    To prevent errors in concrete quantities, you must include the depth of the underground foundation.

  • 3. Retaining wall thickness

    The retaining walls of a typical house are around 200mm thick, and the bottom section may be made thicker depending on the height.

  • 4. Retaining wall types and surcharge rates

    When you select construction materials, the specific gravity is automatically applied, and we recommend applying a 1–3% markup rate.

Standard Unit Weight Table by Material

Types of materials Unit weight (ton/㎥] Remarks (Site characteristics]
reinforced concrete 2.40 Includes rebar reinforcement (RC structure]
Plain concrete 2.30 No rebar (for waste, packaging]
Natural stone/Willow stone 2.60 ~ 2.70 Stone wall, landscaping stone (heavy]
Reinforced soil blocks 1.80 ~ 2.00 Pure block weight excluding rubble infill

Essential Checklist for Fail-Free Construction

This is a key checkpoint that determines the safety of the retaining wall.

  • Installing a weep hole

    Prevent water pressure collapse by drilling at least one drainage hole with a diameter of 50 to 100 mm per pyeong.

  • Foundation ground compaction and lean concrete

    You must create a flat surface by pouring lean concrete after compacting the crushed stone to prevent tilting.

  • Compliance with rebar cover thickness

    Ensure a minimum cover of 40 to 50 mm on surfaces in contact with soil to prevent rebar corrosion.

Frequently Asked Questions (FAQ]

  • Q. When is the formwork removed after pouring the concrete?
  • A. For sufficient strength, please dismantle after curing for 2-3 days in summer and 4-5 days in spring/autumn.
  • Q. How are 'hebe' and 'rube' different?
  • A. Hebe refers to an area in square meters (㎡], and rube refers to a volume in cubic meters (㎥].
  • Q. What should the thickness of the retaining wall be to ensure safety?
  • A. For retaining walls taller than 2m, it is standard practice to obtain a separate structural design for safety.