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How long to reach your goal weight? The honest maths

How long to reach your goal weight? The honest maths

You want to know the date you will reach your goal weight. The honest answer is one simple division, and it comes out as a range of weeks, not one fixed date.

1 Aug 2026 · Burnie Academy
timeline goal-weight maths planning

You step on the scale and you have a goal in mind. Then the big question comes: when will I reach it? This short read gives you the honest maths. It takes one division and two minutes. The real trick is the answer is a range, not a date.

The safe speed: 0.5 to 1 kg a week

Mayo Clinic says lose 0.5 to 1 kilogram a week. That is the safe speed for most adults. Faster sounds great, but the weight often comes back. That rate needs a daily gap of about 500 to 750 calories. That is your food calories minus what you burn. Now the maths. Take the kilos you want to lose. Divide by your weekly rate. The answer is your weeks. Want to lose 8 kg? At 1 kg a week, that is 8 weeks. At 0.5 kg a week, that is 16 weeks. So your honest answer is 8 to 16 weeks.

How many weeks for your goal? (at the safe 0.5 kg a week)

Lose 5 kg
5 divided by 0.5 = 10 weeks. That is about 2.5 months.
Lose 10 kg
10 divided by 0.5 = 20 weeks. That is about 5 months.
Lose 15 kg
15 divided by 0.5 = 30 weeks. That is about 7 months.

You can hit any date if you just try hard enough.

mostly false

mostly false

A fixed date pushes your weekly rate past the safe ceiling. Go too fast and you feel hungry, tired, and cross. The weight often comes back too. The scale does not drop like clockwork either. Some weeks it moves. Some weeks it stalls. A birthday deadline turns a normal stall into panic. A range bends around a stall. A date breaks. The CDC says setbacks happen to everyone, so plan for them.

Set your honest range with Burnie

The bottom line

The maths is one line: weeks equals total kilos divided by your weekly rate. The wisdom is one line too: write the answer as a range, not a date. Mayo Clinic says lose 0.5 to 1 kilogram a week. So 10 kilos becomes 10 to 20 weeks, not a wedding deadline. Set the range. Trust the maths. Let the date bend to your body.

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