Concrete Volume Calculator
Volume and rough cement/ready-mix estimates
Inputs
Industry standard is 5–10% for concrete. Set to 0% if ordering exact volume.
Note: Cement bag and ready-mix tonne estimates are approximate (mix design and density vary).
Results
Enter your dimensions then click Calculate.
NAIBC / IRC codes
References & Sources
Standards Cited
- ACI 318 — Building Code Requirements for Structural Concrete
Defines concrete strength classes and specifying requirements for US construction - ASTM C94 — Standard Specification for Ready-Mixed Concrete
Standard for ready-mix concrete specification, including density and volume calculations
Formulas Used
- Concrete volume:
volumeM3 = length x width x depth x (1 + wastage% / 100)
Source: Basic geometry — Wastage defaults to 0% for backward compatibility; industry standard is 5-10% - Unit conversion (m3 to yd3):
volumeYd3 = volumeM3 x 1.308
Source: Standard unit conversion - Unit conversion (m3 to ft3):
volumeFt3 = volumeM3 x 35.315
Source: Standard unit conversion - Cement bags estimate:
bags25kg = ceil(volumeM3 x 12); bags50kg = ceil(volumeM3 x 6)
Source: ACI 318 (1:2:4 mix ratio) — Based on ~300 kg cement per m3 for a typical 1:2:4 mix - Ready-mix weight:
readyMixTons = volumeM3 x 2.4
Source: ASTM C94 — Ready-mix concrete density approximately 2400 kg/m3
Key Assumptions
- Ready-mix concrete density: 2400 kg/m3 — ASTM C94
- Cement bag estimate based on typical 1:2:4 mix ratio (~300 kg cement per m3 = 12 x 25kg bags) — ACI 318
- Wastage allowance defaults to 0% but 5-10% is recommended for site-mixed or ready-mix concrete — Industry standard practice