SaaS Price Increase Calculator: Break-Even Churn, MRR and NRR

How the price increase calculator works

The calculator runs your customer base forward for 12 months twice: once at today's price and once with the increase. Each month, every group of customers loses your normal churn and gains your normal expansion, and new customers join. In the "with" run, new customers pay the new price from month 1, and existing customers move to it according to the rule you pick:

• All customers, after the grandfathering period. Everyone moves in the month after grandfathering ends. Two months of grandfathering is roughly a 60-day notice.
• At annual renewal. One twelfth of the base renews each month. Contracts that renew during the grandfathering months renew at the old price and keep it for the year.
• New customers only. Nobody you have today pays more.

When a customer reaches the new price, a share of them cancel at once (the cancellation estimate you type in). You can also add extra monthly churn among repriced customers if you expect the increase to wear on retention for longer. Cost to serve does not change with the price: the same customers use the product the same way, so cost of goods sold stays at (1 − gross margin) of what they would pay at the old price.

The break-even churn formula

You rarely know how many customers will leave, so the calculator works backwards: it tells you how many you can afford to lose. For a price increase p and a share x of affected customers who cancel because of it:

• MRR break-even: (1 − x)(1 + p) = 1, so x = p ÷ (1 + p). For a 10% increase that is 0.10 ÷ 1.10 = 9.1%.
• Gross profit break-even: each remaining customer's gross profit rises from GM to GM + p (as a share of the old price), so (1 − x)(GM + p) = GM and x = p ÷ (GM + p). At an 80% gross margin: 0.10 ÷ 0.90 = 11.1%.
• Extra monthly churn break-even, if the increase raises churn for a year rather than causing a one-off wave of cancellations: d = k × (1 − (1 + p)^−1/12), where k = 1 − churn + expansion. With 2% churn and 1% expansion, k = 0.99 and d = 0.78 points for MRR (0.97 points for gross profit).

Gross profit always breaks even later than MRR because the customers who cancel take their cost to serve with them. That gap is widest for low-margin products: at a 50% gross margin a 10% increase breaks even on gross profit at 16.7% cancellations. If you have no data of your own, compare your guess with the break-even rather than with someone else's benchmark: the question is whether you believe more than one in eleven affected customers would leave over a 10% increase.

Worked example: a 10% increase on a $100,000 MRR base

These inputs are illustrative. A company has 400 customers at $250 ARPA ($100,000 MRR), an 80% gross margin, 2% monthly churn, 1% monthly expansion and 15 new customers a month. It raises prices 10% for everyone with two months of grandfathering and expects 5% of existing customers to cancel when the new price reaches them.

Month 1 without the increase: $100,000 × 0.99 + 15 × $250 = $102,750. With it, existing customers are still grandfathered and only the 15 new customers pay $275, so MRR is $103,125. In month 3 the existing base (now $97,030 at the old price) moves to the new price, 5% of those customers (18.8 of them) cancel, and MRR jumps to $113,648. By month 12 the company has $1,673,922 ARR instead of $1,574,930, with about 460 customers instead of 475, and +$79,232 more gross profit over the year.

The 5% estimate is well under the 9.1% break-even, so the increase pays. The break-evens apply to the customers you reprice; new customers paying the higher price add to the gain on top. That is why the whole book still ends ahead at 12% cancellations (+$1,424 of MRR by month 12). On existing customers alone (new customers set to 0), 11% cancellations cost MRR (−$1,861 by month 12) but still add gross profit (+$928 over the year): that is the zone between the two break-evens.

Grandfathering, renewal or new customers only

The same 10% increase lands very differently depending on who pays it and when. Default inputs, 5% cancellations:

Repricing at renewal ends the year close to repricing everyone, because by month 12 most contracts have renewed, but the gain over the year is smaller: the increase reaches customers gradually and two months of renewals stay on the old price. New-customer-only pricing never touches the base, so cohort NRR stays at 88.6% and the gain is small in year one. It grows each year as new customers replace churned ones.

What a price increase does to NRR

A price increase on existing contracts is expansion revenue, so it lifts net revenue retention for the cohort it touches, and the cancellations it causes count against both NRR and gross revenue retention. That makes a price increase an easy way to flatter NRR for one year. Investors who look at NRR by cohort will see a step in the year of the increase that does not repeat, so say so when you report it. The calculator shows the 12-month NRR of today's customers with and without the increase (88.6% and 92.6% in the example).

Pricing model P&L: per seat vs usage vs hybrid

The second tab keeps the same 400 accounts and the same cost to serve, and prices them three ways. Usage per account is spread out the way usage usually is, with a few heavy accounts: you set the median and how many times the median a p90 account uses, and the calculator fits a lognormal curve through them. The inputs below are illustrative.

With a p90 account using 4× the median, the average account uses 1,795 units ($50.90 to serve) and the top 10% of accounts generate 42.1% of all usage. On seats every account pays $250.00, so the p90 account, which costs $95.00 to serve, earns a 62.0% margin against 86.0% for a median account. Pure usage reverses that and ties revenue to the heaviest accounts. Hybrid sits between the two: the platform fee covers the fixed cost of an account and the usage price follows the variable cost. If usage per account grows 30% over a year while seats stay flat, usage and hybrid expand on their own and seat revenue does not.

For the full migration math, including what happens when customers move work to another tool, read what moving from per-seat to hybrid pricing does to your P&L. The definitions of each model are in the SaaS pricing models guide, with deeper pages on usage-based pricing, outcome-based pricing and the accounting for prepaid credits. If your usage cost is AI inference, the AI cost and margin calculator works out the cost per unit, and the billing fees calculator shows what a usage billing platform costs at your volume.

Price increase notice: a template for SaaS customers

Once the numbers work, tell customers early, say what changes and when, and give them a way to lock in the current price if you offer one. A short version you can adapt:

Subject: Your [Product] plan price is changing on [date]

Hi [first name],

On [date], the price of the [plan] plan will change from [old price] to [new price] per [month / seat / year]. Since you joined, we have added [two or three things customers actually use]. Your current price stays the same until [date, or your next renewal on date].

[Optional: If you switch to annual billing before [date], you keep today's price for the next 12 months.]

Questions about your plan? Reply to this email and [name] will help.

[Name], [title]

The date in the notice is your grandfathering period: put the same number of months into the calculator so the forecast matches what you tell customers.

Download the Excel version

The Excel template has the same defaults and the same math as live formulas: a Price increase sheet with the inputs, the three break-evens and the 12-month path, and a Pricing models sheet with the seat, usage and hybrid comparison. No email needed.