OilCalcs is a professional calculator for petroleum engineers, technicians, and quality control personnel working with crude oil, refined products, and specialty liquids. Designed based on the official ASTM D1250-08 (IP 200/08) standard, OilCalcs lets you accurately calculate VCF (Volume Correction Factor), API gravity, density, and perform volumetric flowmeter calibration with temperature correction.

Whether you're working in fuel terminals, laboratories, refineries, or transportation logistics, OilCalcs simplifies your workflow with precise calculations and table generators.

🔹 Key Features:
✅ Volume Correction Factor (VCF) Calculations
Quickly compute VCF at 60°F or 15°C using API gravity, relative density, observed density, or thermal expansion coefficients (TEC).
Includes Tables: 6A, 6B, 6C, 24A, 24B, 24C, 54A, 54B, 54C, 54D.

✅ API Gravity & Density Conversion
Calculate API gravity or density corrected to base temperature using ASTM Tables 5A, 5B, 23A, 23B, 53A, 53B.

✅ Flowmeter Calibration (Meter Proving)
Calibrate fuel and crude oil flowmeters using a standard tank (prover) and compensate for thermal expansion of both fuel and metal tank materials.
Use real-time temperature readings, API/density values, and material-specific coefficients to compute corrected volumes and percentage errors.
Export results to Excel for official reporting.

✅ ASTM Table Generator
Generate and view complete ASTM tables for custom API, density, and temperature ranges.
Light tables (up to 30x3) can be shared via text; larger ones are exported as Excel files.

✅ Unit Converter
Bidirectional conversion of temperature (°F/°C) and volume (bbl, m³, L, gal, ft³, Mbbl, cm³, imp gal, inch³, daL). Designed with smart decimal formatting based on unit scale.

🛠️ Premium Version Includes:

⭐Full-range calculations for any API gravity and temperature, with no restrictions.
⭐Generation of tables across any range of API, density, and temperature.
⭐Export of generated tables to WhatsApp or other platforms in text and Excel formats.
⭐Export of results from the "Flowmeter Calibration" utility to Excel.
⭐Permanent removal of all advertisements.


🛑 Trial Limitations (Free Version):
• Calculations are limited to API ranges typically used for gasoline and diesel.
• VCF results available but table export is restricted.
• Flowmeter calibration available, but Excel export is disabled.
→ Upgrade to Premium to unlock the full power of OilCalcs.

📘 Supported ASTM Tables Overview:
5A / 5B: Correct observed API to 60°F (crudes and refined products)

6A / 6B / 6C: Calculate VCF at 60°F using API or TEC

23A / 23B: Correct observed relative density to 60°F

24A / 24B / 24C: VCF from relative density or TEC (base temp 60°F or 15°C)

53A / 53B: Correct observed density to 15°C

54A / 54B / 54C / 54D: Calculate VCF at 15°C using density, TEC, or vacuum density

🌍 Why Choose OilCalcs?
Based entirely on ASTM D1250 – the global petroleum standard

Combines technical accuracy with a modern, intuitive interface

No internet connection required – all calculations are local

Ideal for fuel transporters, lab analysts, quality auditors, inspectors, and engineers

Start your journey with OilCalcs and take control of your petroleum measurements with confidence and precision.