A bigger coffee total does not tell you why it grew. The drink may cost more, you may have bought it more often, or both may have changed. You can separate those questions without turning a familiar routine into a lecture.

Create My Piggy in your browser to set a target and compare it with purchases you explicitly record. No account or app download is required. This is a manual budget, not a bank connection or a complete spending history.

For the price-only part of the example, open the coffee calculator. It starts at five purchases weekly; change that to three as described below. The calculator holds frequency constant within each comparison—it cannot automatically compare two different routines.

Start with comparable drinks and an honest count

Use the same drink, size and extras. Keep tax, discounts, fees and tips on the same basis. A larger drink or an extra pastry is a different purchase, not evidence that the same coffee price rose. Count drinks, not just visits: one receipt might include two coffees. Missing receipts remain missing; they do not prove you bought nothing.

The CFPB's spending-tracker guide, published June 11, 2019, suggests tracking at least two weeks or a month to see spending habits more clearly. That is practical context for collecting observations, not a claim that this fictional coffee routine represents anyone's actual spending.

A fictional week: two changes, not one

For this October 21, 2026 planning example, assume one identical 12-US-fluid-ounce coffee per purchase. The old price is USD 5.00 and the scenario price is USD 5.50. Both include any applicable tax; assume no tip, fee, discount, bundle or other item. These are invented inputs, not verified menu prices.

The old routine is three purchases per week: 5.00 × 3 = USD 15.00. The new routine is five: 5.50 × 5 = USD 27.50. The combined difference is USD 12.50 weekly.

One useful decomposition holds the old routine steady first: (5.50 − 5.00) × 3 = USD 1.50 from price. Then add the two extra drinks at the new price: 5.50 × (5 − 3) = USD 11.00 from frequency. Together, 1.50 + 11.00 = USD 12.50. This ordering assigns the interaction between price and count to the extra drinks; another ordering changes the attribution, not the combined total.

Use the calculator for the part it actually supports

Open the coffee preset and choose USD, item, previous price 5.00, scenario price 5.50, one unit per purchase and three purchases per week. Confirm compatibility only when the drink and tax/discount treatment really match. The result is USD 1.50 more weekly, USD 6.50 per average month and USD 78.00 over 52 weeks. That is the price-only component at the old routine.

At five purchases per week, the same price comparison gives USD 2.50 weekly, about USD 10.83 per average month and USD 130.00 over 52 weeks. This second result is not the full USD 12.50 routine change. Do not describe it as such. The calculator has one frequency input shared by both prices, no receipt OCR and no live forecasts. Changing its currency label does not convert amounts.

Keep a projection separate from what happened

If both fictional routines continued for 52 weeks, the old projection would be USD 780.00 and the new one USD 1,430.00: a USD 650.00 difference, or about USD 54.17 per average month. These use 52 weeks divided by 12, not the dates in your next calendar month. Holidays, travel or a different routine would change the projection. None of this establishes actual savings or a merchant's price trend.

For a short experiment, record the drink specification, comparable paid price, number of drinks and date for two equal-length periods. Keep unknown fields unknown. Optional My Piggy saving is browser-local, not cloud backup or native-app sync. The separate receipt scanner can export one photo per XLSX after your review, but a partial set of receipts cannot establish complete spending.

Your takeaway: choose which question to change

A price rise and a busier routine call for different choices. You might keep both, change one, or simply give the category a more realistic target. The useful result is knowing what your numbers describe.

Try the price-only comparison, changing frequency to three for the first component above. Then create or review your manual budget using the spending you actually record. The web beta is live; the separate native iPhone app is coming soon.

Sources and coverage

The CFPB source supports the general spending-tracker approach only. All coffee prices, drink specifications and purchase frequencies are explicitly fictional editorial assumptions. No current merchant price, inflation estimate or inventory-to-coffee-price relationship is asserted.

A little clarity, not a guarantee

Projections are not recorded spending or confirmed savings. No national average or future price is inferred. The web calculator does not upload receipts, send family requests, or update the iPhone app.