Free financial calculators with a decisive edge.
Move from guesswork to clarity with bold tools for mortgages, savings, investing, options trading, and FIRE. Every output updates instantly, with no accounts or spreadsheets required.
Most used
Mortgage + Refinance
Speed
Instant
Accuracy
Bank-grade
Built for decisive financial moves.
Home + Loans
Mortgage, affordability, and payoff clarity for every major lending decision.
Home Affordability
See the maximum home price you can afford using the 28/36 rule, PMI, and local taxes.
Mortgage Calculator
Calculate payments with taxes, insurance, PMI, and HOA fees to understand total housing costs.
Refinance Calculator
Compare your current loan versus a new rate, see break-even months, and lifetime savings.
Amortization Schedule
Generate payoff timelines and charts with extra payments for any loan.
Down Payment Calculator
Determine how much you need to put down and whether you can avoid PMI for your loan.
Loan Calculator
Calculate monthly payments for auto loans, personal loans, or any installment debt.
Debt-to-Income Ratio
Check your DTI to see if you qualify for mortgages and other lending requirements.
Savings + Investing
Build momentum with compounding, goal planning, and smart allocation choices.
Emergency Fund
Plan 3-12 months of expenses with job security, dependents, and homeowner factors.
529 College Savings
Project future tuition costs with inflation and see the contributions required to stay on track.
Compound Interest
Visualize how contributions and time grow your investments exponentially.
Savings Goal Planner
Calculate how much to save every month to hit any goal on time.
Debt vs Investing
Decide whether to pay debt faster or invest extra money by comparing net worth outcomes.
Retirement
Plan for the long horizon with tax-aware, inflation-adjusted projections.
Retirement Savings
Forecast your retirement nest egg, inflation-adjusted income needs, and potential gaps.
401(k) Growth
Project your 401(k) with employer match schedules and contribution limits.
FIRE Calculator
Explore Lean, Regular, and Fat FIRE paths plus Coast FI numbers.
Roth vs Traditional IRA
Compare Roth and Traditional IRAs with tax savings, phase-outs, and future values.
RMD Calculator
Calculate Required Minimum Distributions for retirement accounts. SECURE Act 2.0 rules, QCD planning.
Taxes
Estimate real outcomes from gains and withdrawals before you sell.
Options
Analyze single-leg and multi-leg trades with confidence.
Options Profit Calculator
Calculate profit, loss, and break-even for call and put options. Visualize P&L with risk analysis.
Options Strategy Builder
Stack multi-leg option combinations, visualize payoff curves, and compare advanced strategies like iron condors or butterflies.
Why Use InstantAmount?
Instant Results
Get accurate calculations in real-time as you adjust inputs. No waiting, no loading.
100% Free & Private
No signup, no email required. Your calculations stay on your device.
Accurate & Reliable
Based on standard financial formulas used by banks and lenders nationwide.
Ready to Make Smarter Financial Decisions?
Choose a calculator to get started. All calculations are instant and completely free.