Mud Blending & Weighted Average Calculator
Blend up to 4 fluids to find the resulting density, or calculate the volumes of two fluids needed to reach a target density.
Fluid Blending
Enter volume and density for each fluid. Blended density = Σ(Vi × ρi) / ΣVi
Blended Density
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Total Volume
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Total Mass
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Blend Composition
How this was calculated
Blending: Blended density = Sum(Vi x rho_i) / Sum(Vi). This is a mass-weighted average assuming ideal mixing (no volume change on mixing).
Target calculator: V_B = V_target x (rho_target - rho_A) / (rho_B - rho_A), then V_A = V_target - V_B. Target density must be between the two fluid densities.
Need help with drilling fluid design, mud engineering, or operational optimization?
Book a free strategy call →Understanding Fluid Blending in Drilling
Mud blending is one of the most common daily calculations on a drilling rig. Whether weighting up with barite, diluting with base fluid, or mixing two mud systems together, the weighted average formula governs the resulting density. Getting this calculation right is essential for maintaining proper hydrostatic pressure and staying within the safe drilling window.
The target density calculator solves the inverse problem: given a desired density and total volume, how much of each fluid do you need? This is particularly useful when preparing kill mud, mixing completion brines to a specific density, or blending two active mud systems during displacement operations.
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