Price increase calculator

What a price increase costs you

See what a new price for a subscription, plan, rent or fee costs you per month, per year and over the years ahead, and whether an alternative is worth switching to.

New to this? See how it works ↓

Your numbers · replace with your own

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Your result

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Difference per billing period
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Difference per month
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Difference per year
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Over the years ahead
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An illustration based on the numbers you entered, not a forecast and not advice.

Assumptions & limits

  • The calculation adds up the difference at today's prices; it doesn't apply inflation or interest.
  • It assumes the new price stays the same for the whole period you chose.
  • Taxes and promotional first-year prices are included only if you type them into the prices.

How it works

Turning a small rise into a yearly number

A price that goes up by a few dollars a month rarely feels like much. The calculator turns that difference into the figures that matter: what it adds up to per month, per year and over the number of years you plan to keep paying. Enter the old price, the new price and how often you are billed, and the result updates as you type.

The difference is multiplied by the number of billing periods in a year (52 for weekly, 12 for monthly, 4 for quarterly and 1 for yearly) and then divided back down to a monthly figure, so plans billed in different ways can be compared. If you add a monthly budget, you also see what share of it the increase takes. If you add an alternative price and a one-off cost to switch, the calculator shows how much switching would save and how many months it takes to cover the switching cost.

Everything is a plain sum at today's prices. There is no inflation, no interest and no promise that the new price will stay where it is, so treat the result as an illustration of the numbers you typed in, not as a forecast. Nothing you enter is stored or sent anywhere; the copy-link button only puts your values into the web address so you can share the calculation.

Formula

k            = billing periods per year (weekly 52, monthly 12, quarterly 4, yearly 1)
delta        = new price − old price
per_year     = delta × k
per_month    = per_year ÷ 12
over_horizon = per_year × years
pct_change   = delta ÷ old price × 100        (only if old price > 0)
budget_share = per_month ÷ budget × 100       (only if a budget is given)

If an alternative price is given:
saving_per_year  = (new price − alternative) × k
saving_per_month = saving_per_year ÷ 12
break_even       = switching cost ÷ saving_per_month   (months)

Worked example

A $15.99 plan that rises to $22.99

A streaming bundle goes from $15.99 to $22.99 a month, billed monthly, and you expect to keep it for five years.

Worked example, step by step
Step Result
Difference per month $22.99 − $15.99 = $7.00
Difference per year $7.00 × 12 = $84.00
Over 5 years $84.00 × 5 = $420.00
Change in price $7.00 ÷ $15.99 = +43.8%

Common questions

Does the calculator account for inflation?

No. It adds up the difference at today's prices. To see how big the rise is in context, compare the result with how much your income or your other bills have gone up over the same period.

What if the price goes down?

The numbers turn negative and the result reads as a saving. The same formulas apply: a lower new price simply gives a negative difference per year.

How is the share of my budget calculated?

The monthly difference is divided by the monthly budget you enter and shown as a percentage. If the increase is larger than the budget, the share is above 100% and is shown as it is.

How do I know whether switching is worth it?

Enter the alternative's price and any one-off cost to switch. The calculator shows the saving per month and per year, and how many months it takes for those savings to cover the switching cost. If the alternative isn't cheaper, it says so instead of showing a break-even.

Other ways to ask what it costs you

When does it pay off How long a one-off purchase takes to earn back its price through lower running costs. Open calculator → Cost per unit and per use Big pack or small, buy or subscribe — which is cheaper once you divide it out. Open calculator → What it costs to run What an appliance or a habit costs per month and per year, and what a replacement saves. Open calculator →

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