The Rule of 70: How Quickly the Cost of Living Can Double

Most people understand that prices rise over time. But very few people realize how fast those increases can compound.

A simple concept called the Rule of 70 helps explain this.

The Rule of 70 estimates how long it takes for prices to double due to inflation.

The formula is simple:

70 ÷ Inflation Rate = Years for Prices to Double

Let’s look at some examples.

If inflation averages 2%

70 ÷ 2 = 35 years

This means prices could double in about 35 years.

If inflation averages 5%

70 ÷ 5 = 14 years

Prices could double in 14 years.

Now let’s look at something closer to what many families are experiencing today.

If inflation is around 7%

70 ÷ 7 = 10 years

That means something that costs $50,000 today could cost $100,000 in about 10 years.

Let’s apply this to real life.

A family spending $6,000 per month today could need roughly $12,000 per month in about 10 years if inflation continues at that rate.

This is why financial planning must always consider future purchasing power.

Saving money alone is not enough.

Your strategy must also focus on growth that has the potential to keep up with inflation.

Because the goal is not just saving dollars.

The goal is protecting what those dollars can buy in the future.

For more insights or a personal discussion, book a meeting

— Sahil Virani