Trading with vwap and mvwap
Trading With VWAP And MVWAP
Volume weighted average price (VWAP) and moving volume weighted average price (MVWAP) are trading tools that can be used by all traders. However, these tools are used most frequently by short-term traders and in algorithm based trading programs.
MVWAP may be used by longer term traders, but VWAP only looks at one day at a time due to its intra-day calculation. Both indicators are a special type of price average which takes into account volume; this provides a much more accurate snapshot of the average price. The indicators also act as benchmarks for individuals and institutions who wish to gauge if they got good execution or poor execution on their order. (For a primer, see Weighted Moving Averages: The Basics .)
Choose your time frame (tick chart, 1 min, 5 min, etc.)
Calculate the typical price for the first period (and all periods in the day following). Typical price is attained by taking adding the high, low and close, and dividing by three: (H+L+C)/3

Multiply this typical price by the volume for that period. This will give us a value called TP*V.
Keep a running total of the TP*V values, called cumulative TPV. This is attained by continually adding the most recent TPV to the prior values (except for the first period, since there will be no prior value). This figure should always be getting larger as the day progresses.
Keep a running total of cumulative volume. Do this by continually adding the most recent volume to the prior volume. This number should only get larger as the day progresses.
Calculate VWAP with your information: cumulative TPV/cumulative volume. This will provide a volume weighted average price for each period and will provide the data to create the flowing line which overlays the price data on the chart.
It is likely best to use a spreadsheet program to track the data if you are doing this manually. A spread sheet can be easily set up.