Wrenchpost

Free tool · Pricing

Raise prices without guessing.

A rise of r% keeps the same revenue as long as fewer than r ÷ (1 + r) of your clients leave. For a 10% rise that's about 9.1% of clients. Put in your own numbers to see your break-even, then draft the letter.

Cost
Free
Inflation data
BLS CPI
Output
Letter + email
Your recurring clients

Clients on repeat service

$
%
$

Labour, travel, materials. Unlocks margin break-even.

%

Your guess. We don't publish a typical rate.

Letter details (optional, fill in now or later)

Give at least one full billing cycle of notice.

Costs that have actually gone up for you

Only tick what's true for your business.

Tone

Runs in your browser. Nothing you type is sent to us.

🔒 Runs in your browser. The numbers you type aren't sent to us.

Common questions

How is the break-even worked out?+

If you raise prices by r (for example 0.10 for 10%), each client who stays pays (1 + r) times as much. Revenue stays the same if the share who leave is r ÷ (1 + r). With your cost per visit we also work out the margin break-even: the share you could lose and keep the same gross margin.

Where does the inflation figure come from?+

The U.S. Bureau of Labor Statistics Consumer Price Index for All Urban Consumers (CPI-U, series CUUR0000SA0, not seasonally adjusted). We compare the month you pick with the latest month we've loaded. It's general inflation, not your costs.

How many clients will leave?+

We don't know, and we don't publish a typical rate because we haven't found one we trust. Use your own history and test a few rates in the what-if table.

How much notice should I give?+

At least one full billing cycle is a sensible minimum, and more for annual plans. Your agreements may also say how much notice you must give: check them.

Is anything stored?+

No. Everything runs in your browser. If you unlock the full version we store your email and simple counts (client count, rise %).

Sources · checked 2026-10-28

Estimates only

All results are estimates based only on the inputs you enter. They are not a forecast or professional advice. CPI is a general US inflation measure and may not match your costs. The letter is a draft: check it against your agreements before you send it.

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