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Let us frist start with body analysis. For a normal female adult, you will need around 8000 KJ each day; For a normal male adult, you will need around 8500 KJ each day.

0.5 kg of body fat = around 16,000 KJ (or 4,000 calories).

To lose 0.5kg of body fat each week through exercise, you need to burn off  2,500 KJ (600 calories) additionally each day.

So how much exercise is necessary: that amount of exercise burns an additional 2,500 kJ each day, or 16,000kJ per week.

The amount of exercise  to burn the total 16,000kJ per week will be:

    * 10 hours of walking at 5kph (3mph) per week - or 90 minutes per day.

    * 4 hours of jogging at 10kph (6mph) per week - or 35 minutes per day.

    * 4.5 hours of cycling at around 20kph (12mph) per week - or 40 minutes per day.

These amounts assume to lose weight by exercising alone. If  dieting changes to contribute half the energy required still can halve the amounts of exercise.

Lives are so different, weight loss can't realistically be reduced to a simple equation.

There are other variables to be taken into account:
    *  weight loss goals

    * motivation

    * itness levels

    * energy levels

    * time availabilities

    * exercise program

    * exercise progression

    *attitude

    * frequency of exercise

    * physical abilities

    * kilojoules or calories prepared to eat

It's also important to remember to take change from day to day, week to week, month to month and year to year.