Side-by-side decision tools
Financial comparison calculators
Financial comparison calculators hold the decision constant, compare two alternatives on the same timeline, and see which assumption actually changes the result. These 15 tools put total cost, cash flow, taxes and opportunity cost beside the headline number — each prefilled with a worked example you can replace.
How to make a fair comparison
Use the same starting date, holding period and currency. Include fees and end values, save a baseline, then change one uncertain assumption. A result that reverses after a small change deserves a range, not a false point estimate.
Loan Comparison Calculator
Compare payment and lifetime interest for two loan offers.
Compare scenarios →02Rent vs. Buy Calculator
Compare estimated renting costs with ownership costs and equity.
Compare scenarios →0315 vs. 30 Year Mortgage Calculator
Compare monthly payments and total interest across two mortgage terms.
Compare scenarios →04Fixed vs. ARM Calculator
Estimate an adjustable-rate mortgage reset payment under cap assumptions.
Compare scenarios →05HELOC vs. Home Equity Loan Calculator
Compare a modeled interest-only HELOC with a fixed-rate home-equity loan.
Compare scenarios →06Mortgage Points vs. Down Payment Calculator
Compare using the same cash for discount points or a larger down payment.
Compare scenarios →07Lease vs. Buy Calculator
Compare lease outlay with purchase payments and resale value.
Compare scenarios →08Debt Snowball vs. Avalanche Calculator
Simulate highest-rate-first and smallest-balance-first payoff strategies across three debts.
Compare scenarios →09Traditional vs. Roth IRA Calculator
Compare modeled after-tax future values under current and future tax rates.
Compare scenarios →10Pension Lump Sum vs. Annuity Calculator
Compare a pension stream’s present value with a lump-sum offer.
Compare scenarios →11Muni vs. Taxable Bond Calculator
Compare a taxable after-tax yield with a municipal tax-equivalent yield.
Compare scenarios →12Equipment Lease vs. Buy Calculator
Compare lease cost with financed purchase cost after residual value.
Compare scenarios →13W-2 vs. 1099 Calculator
Compare employee compensation with contractor revenue after expenses and extra tax.
Compare scenarios →14Health Insurance Plan Cost Calculator
Estimate expected and worst-case annual health-plan cost.
Compare scenarios →15Job Offer Total Compensation Calculator
Estimate annual offer value from salary, bonus, equity, benefits and job costs.
Compare scenarios →Every comparison, one table
What each comparison returns
The headline figure each tool produces at its own worked-example inputs, so the whole set is scannable before you open one.
| Comparison | The decision it settles | Headline output | Worked example |
|---|---|---|---|
| Loan Comparison Calculator | See whether the lower payment actually costs less. | Lower lifetime cost saves | $603 |
| Rent vs. Buy Calculator | Find the holding-period assumptions that change the decision. | Estimated buy advantage | $36,001 |
| 15 vs. 30 Year Mortgage Calculator | Quantify the payment-versus-interest tradeoff. | Long-term extra interest | $260,511 |
| Fixed vs. ARM Calculator | Stress-test payment shock before choosing an ARM. | Estimated reset payment | $2,803 |
| HELOC vs. Home Equity Loan Calculator | Stress-test variable rate and repayment-period risk. | Fixed-loan lifetime cost advantage | $28,855 |
| Mortgage Points vs. Down Payment Calculator | Match the choice to expected holding time and liquidity. | Monthly advantage of points | $52 |
| Lease vs. Buy Calculator | Evaluate flexibility and equity alongside cost. | Estimated cost advantage of buying | $7,715 |
| Debt Snowball vs. Avalanche Calculator | Choose the method you can follow while keeping every minimum current. | Avalanche interest savings vs. snowball | $701 |
| Traditional vs. Roth IRA Calculator | Focus on the tax-rate and funding assumptions driving the result. | Roth after-tax advantage | $95,724 |
| Pension Lump Sum vs. Annuity Calculator | Include survivor options, guarantees and plan credit risk. | Present value of pension | $530,467 |
| Muni vs. Taxable Bond Calculator | Compare taxes and risk on the same basis. | Taxable after-tax yield | 3.4% |
| Equipment Lease vs. Buy Calculator | Add tax, maintenance and obsolescence differences separately. | Purchase cost advantage | $55,761 |
| W-2 vs. 1099 Calculator | Price benefits, risk and unpaid time explicitly. | Contractor advantage | -$4,945 |
| Health Insurance Plan Cost Calculator | Compare premiums and cost sharing under the same care scenario. | Expected annual plan cost | $8,000 |
| Job Offer Total Compensation Calculator | Compare offers using consistent probability and benefit assumptions. | Estimated annual offer value | $147,000 |
Each figure is produced by that calculator’s published formula at its prefilled inputs. Open any comparison to substitute your own numbers. Comparisons are most useful when both options run on identical assumptions, because a difference that comes from one calculator assuming a longer term or a different compounding schedule tells you about the assumptions and says nothing about the better option, so every pair here uses the same inputs on both sides.
Which comparison fits which decision
Use the Loan Comparison calculator when two offers differ in rate, fees or length, and the 15 vs. 30 Year Mortgage calculator when the question is payment relief against lifetime interest. Rent vs. Buy and Lease vs. Buy cover the choice between flexibility and ownership, and both turn on how long you will stay. Fixed vs. ARM and HELOC vs. Home Equity Loan test payment shock when a rate can move. Mortgage Points vs. Down Payment compares two uses of the same cash.
For money outside housing, Traditional vs. Roth IRA compares taxes now with taxes later, Pension Lump Sum vs. Annuity compares an income stream with a lump-sum payment, and Muni vs. Taxable Bond compares yields after tax. W-2 vs. 1099 compares a job with contract work, and the health plan and job offer tools price everything around the salary. Debt Snowball vs. Avalanche compares two orders of payoff on the same three balances.
Why identical assumptions decide the result
A difference between two options can come from the options or from the assumptions behind them. A ten year horizon on one side and twenty on the other, or a tax rate applied to one and not the other, produces a gap that says nothing about which choice is better. Every calculator here runs both sides on the same starting date, holding period and rate basis, so the gap you see belongs to the decision.
The second check is sensitivity. If a small change in one assumption flips the answer, the honest conclusion is a range and the assumption to watch, not a winner. Change one input at a time, note where the ranking reverses, and ask whether that value is plausible for you. Fees, taxes, the time you will hold the asset and the return you could earn elsewhere are the four inputs that reverse comparisons most often.