Most people unknowingly forfeit hundreds of dollars each year by swiping the wrong card. Enter your current card and monthly spending — the leakage calculator shows exactly where you're losing, category by category.
Rewards leakage is the gap between what you're earning and what the best available card would earn on the same spending. It's not money you've lost — it's rewards you never earned in the first place because your card's multipliers didn't match your spending pattern.
The formula is simple: for each category, leakage = (best available rate − your current rate) × annual spend. The sum across all categories is your total annual leakage — the upper bound of what a card change could recover.
At $600/month on groceries, the difference between a 1.5% flat-rate card and a 4% grocery card is $198/year. Over five years, that's nearly $1,000 in forfeit rewards — before accounting for the opportunity cost of those points if transferred to travel partners at higher value.
Leakage analysis consistently shows that a single specialist card — one that earns 4–6x on your highest-spend category — eliminates 60–80% of total leakage for most people. You don't need a different card for every category. The Rewards Optimizer can find the exact 1–3 card combo that closes the gap for your specific profile.
This tool computes cash-equivalent leakage using conservative point valuations. If you transfer points to airline or hotel partners and consistently achieve 2–3 cpp, your actual leakage from using a 1% card is proportionally higher. Connect real transactions in the WalletFlo app to see leakage calculated on your actual history at your actual redemption value.
Rewards leakage is the gap between the rewards you're actually earning and the maximum you could earn by using the right card in each spending category. The calculator quantifies this gap in dollars per year.
Identify your top spending categories and make sure you have at least one card earning 3%+ in each. A well-chosen 2-card wallet eliminates most leakage without adding complexity.
Groceries and dining are the most common culprits — general cards earn 1.5-2% while specialist cards earn 4-6%. On $600/month in groceries, that's $144-$270/year in leakage from a single category.
Yes. The suggested "fix" card for each category is shown net of its annual fee prorated against your spend in that category. A card with a $95 fee is only recommended if the incremental rewards on your spend exceed $95/year.