EnCalcOU calculates the use and cost of oil, allowing both the real cost based on tank readings and forward prediction based on the readings and elapsed time. The results can be saved to a log files for later analysis.The log files save details of deliveries, a history of oil use and the results of caculations. EnCalcOU copes with tanks of varying shapes, varying tax/VAT rates including separate rates for oil and deliveries. It also calculates the amount of CO2 generated. EnCalcOU is part of the JSutils group of software utilities which have a theme of energy conservation. Requires a registration code (free for personal non commercial use).