Uploaded May 2026 | Updated September 2026, 2 weeks ago
Extrapolation is the technique of forecasting future values by extending past trends forward.
If a business's sales have grown 5% a year for the last five years, extrapolation projects another 5% for next year. It's the simplest forecasting method and a common starting point for planning.
The strength of extrapolation is that it's quick, cheap and based on real data. It works well when conditions are stable and the underlying drivers haven't changed.
The weakness is that it assumes the future will look like the past, and the future often doesn't. A new competitor, a recession, a regulatory change, or a shift in consumer taste can break the trend overnight. The further forward you extrapolate, the riskier the forecast.
Extrapolation is most useful for short horizons and slow-moving markets. For long-term or volatile markets, it should be combined with qualitative judgement, scenario analysis and external research.
A common pitfall is to extrapolate from too few data points, or to ignore obvious turning points in the trend. So For any business, extrapolation is a useful first cut, but never a final answer.
Extrapolation is the technique of forecasting future values by extending past trends forward.
If a business's sales have grown 5% a year for the last five years, extrapolation projects another 5% for next year. It's the simplest forecasting method and a common starting point for planning.
The strength of extrapolation is that it's quick, cheap and based on real data. It works well when conditions are stable and the underlying drivers haven't changed.
The weakness is that it assumes the future will look like the past, and the future often doesn't. A new competitor, a recession, a regulatory change, or a shift in consumer taste can break the trend overnight. The further forward you extrapolate, the riskier the forecast.
Extrapolation is most useful for short horizons and slow-moving markets. For long-term or volatile markets, it should be combined with qualitative judgement, scenario analysis and external research.
A common pitfall is to extrapolate from too few data points, or to ignore obvious turning points in the trend. So For any business, extrapolation is a useful first cut, but never a final answer.
