Coffee Spend Calculator

The "rent vs coffee" calculator shows daily discretionary spending as a percentage of rent, illustrating how recurring small costs add up and what they could become if invested. Use this calculator for accurate, instant results.

The calculator uses the standard published formula for rent vs coffee. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Monthly coffee spend = Coffees/day × Price × 30. Each step in the calculation is shown so you can verify the result manually.