Standards-based tools for blending engineers and formulation chemists. Pick a tool, compute inline — no reloads, no registration.
A working set of standards-based calculators for blending engineers and formulation chemists. Every formula follows published ASTM, ISO or SAE methods — open any tool and compute right here, no registration required.
Calculate VI from kinematic viscosity at 40 °C and 100 °C, with a temperature–viscosity curve.
Open calculatorEstimate kinematic viscosity at any operating temperature from two measured data points, using the ASTM D341 Walther equation.
Open calculatorIdentify the ISO 3448 viscosity grade from KV40, and the SAE J300 high-temperature engine-oil grade from KV100.
Open calculatorPredict the kinematic viscosity of a two-component blend using the ASTM D7152 Wright method.
Open calculatorFind the volume ratio of two oils needed to hit a target kinematic viscosity — the inverse of the ASTM D7152 blend.
Open calculatorCalculate the exact volume and weight of additive needed for any batch size, plus its TBN contribution.
Open calculatorCalculate the Total Base Number of a finished lubricant blend from additive treat rates.
Open calculatorEstimate the theoretical sulfated ash a metallic detergent or other metal-bearing additive contributes to a finished oil, per ASTM D874.
Open calculatorCalculate the phosphorus, zinc and sulfur an additive (e.g. ZDDP) adds to a finished oil — for API SP / ILSAC limit checks.
Open calculatorConvert viscosity, temperature, concentration, and density units used in lubricant formulation.
Open calculatorCorrect lubricant volume and density between an observed temperature and the 60 °F (15.56 °C) reference, per API MPMS 11.1 / ASTM D1250.
Open calculatorDisclaimer: Results are for reference only. Verify against laboratory measurements (ASTM D445, D2896, D2270, etc.) before use in production formulations. CheMost accepts no liability for formulation decisions based solely on these tools.
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