Month-over-Month Calculator for Monthly Growth and Change

The month-over-month calculator measures how a metric moved from one calendar month to the next. Finance, sales, product, and operations teams use month-over-month change when a weekly pulse is too noisy and a year-over-year view is too slow. Enter the previous month’s value and the current month’s value. The primary result is the percentage change, supported by the absolute difference so a 25% jump on a small base is not confused with a 25% jump on a large base. The identity is simple: percentage change = (current − previous) / previous × 100. Absolute change = current − previous. A positive percentage is growth; a negative percentage is contraction. Because the previous month is the denominator, it must be greater than zero. The unit field is a label only—currency, users, or orders—and does not change the math. Keep both inputs in the same unit and on the same definition of the metric. Mixing booked revenue with cash collections, or mixing daily active users with monthly unique users, produces a percentage that cannot be compared with last month’s dashboard. Use the month-over-month calculator for revenue, billings, ad spend, headcount cost, website sessions, or any recurring operating metric. It is especially useful in board packs and KPI reviews where leaders ask whether the latest month accelerated or slowed. Pair it with year-over-year change when seasonality is strong: retail December-to-January declines are often expected, while a December-to-January increase can be more informative after you also check December versus the prior December. Month-over-month percentages are volatile. A one-week outage, a 31-day month versus a 28-day month, a price change, or a one-time invoice can swing the result. For SaaS, distinguish new bookings from net revenue retention; for marketplaces, separate gross merchandise volume from take rate. Recalculate after restatements, and write down the exact metric definition next to the inputs so later comparisons remain apples-to-apples. The calculator does not annualize the rate or apply seasonal adjustment; those are separate analyses.