Money Calculators That Actually Make Sense

The formula is: A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]

• P = Initial principal
• r = Annual interest rate (decimal)
• n = Compounding periods per year
• t = Number of years
• PMT = Regular contribution per period

M = P × [r(1+r)^n] / [(1+r)^n - 1]

PITI = Principal + Interest + Taxes + Insurance. This is the true monthly cost most lenders use to qualify borrowers.

Adding extra to your monthly payment reduces principal faster. Even $50/month extra on a $25,000 loan at 8.5% can save hundreds in interest and pay off months early.

• 15-18% — Standard restaurant service
• 20-25% — Excellent service
• 10-15% — Casual or counter service
• $1-2 per drink — Bar tipping at counter

Uses 2026 federal brackets and standard deduction. Does NOT include state income tax.

2026 Standard Deduction: Single $15,200 · Married $30,400 · HoH $22,800

Consult a tax professional for filing decisions.

The "4% rule" suggests you can safely withdraw 4% of your retirement portfolio annually. You need 25 times your annual spending by retirement.

ROI: Total percentage gain over the entire period.

CAGR: The annualized rate of return. Formula: CAGR = (Final / Initial)^(1/Years) - 1

At 24% APR, paying only the minimum on a $5,000 balance can take 20+ years and cost $7,000+ in interest. Pay at least 3× the minimum to avoid the trap.

• Under 1 year: High-yield savings (4-5% APY)
• 1-3 years: CDs or money market
• 3-5 years: Conservative bond funds
• 5+ years: Diversified investments

• Long-term average: ~3.1%
• Fed target: 2.0%
• 2021-2024: ~5.5% (post-pandemic)