Free Financial Calculators
Whether you're taking out your first personal loan, comparing mortgage offers on a $400,000 home, or trying to figure out whether your salary is competitive — our financial calculators give you the numbers you need without the jargon. Every tool is free, works instantly in your browser, and requires no sign-up.
The most common use case? Running the numbers before you commit. Use the loan payment calculator to see exact monthly payments before you walk into the bank. Run the mortgage calculator to understand how a 0.5% rate difference affects your total cost over 30 years — it's often $30,000–$50,000. Use the monthly budget calculator to make sure you can actually afford those payments alongside your other expenses.
If you're focused on building wealth, the compound interest calculator shows why starting to invest 10 years earlier can double your final balance. The ROI calculator puts any investment in perspective — from real estate to index funds to starting a business. And if debt is weighing you down, the debt payoff calculator maps out the fastest route to being debt-free using either the avalanche or snowball strategy.
This category covers every major financial decision an individual or small business owner faces: credit scoring, retirement planning, break-even analysis, leasing vs. buying, and more. All calculators work with US and UK financial conventions — 30-year mortgages, credit score considerations, dollar-based scenarios.
Featured Calculators
Loan Payment Calculator PRO
Annuity & decreasing payments, overpayment simulation, side-by-side scenario comparison.
FeaturedMortgage Calculator PRO
Full amortization schedule, PMI, extra payments, and total cost over 30 years.
FeaturedCompound Interest Calculator PRO
See how starting 5 or 10 years earlier changes your final balance — with inflation-adjusted returns.
FeaturedMonthly Budget Calculator
Track your income and expenses with the 50/30/20 rule and multiple budget categories.
FeaturedDebt Payoff Calculator PRO
Snowball vs. avalanche strategy comparison, month-by-month payoff timeline.
FeaturedROI Calculator PRO
NPV, IRR, cashflow chart, benchmark comparison — for any investment or business project.
Loan Payment Calculator PRO
Calculate annuity & decreasing payments, simulate overpayments, compare scenarios.
Mortgage Calculator PRO
Calculate your monthly mortgage payment based on home price and down payment.
Compound Interest Calculator PRO
Delay cost simulation, scenario comparison, real rate with inflation adjustment.
Inflation Calculator PRO
Compare scenarios, see year-by-year timeline, calculate minimum return to protect capital.
Salary Calculator PRO
Convert annual salary to hourly rate and vice versa.
ROI Calculator PRO
Investment return analysis, year-by-year timeline, benchmark comparison, dynamic interpretation.
Car Loan Calculator PRO
Calculate monthly car loan payments and total financing cost.
Savings Goal Calculator PRO
Calculate how much to save monthly to reach your financial goal.
Leasing Calculator PRO
Calculate monthly lease payments and compare leasing vs buying.
Break-even Calculator
Find out when your business becomes profitable.
Rent vs Buy Calculator PRO
Compare the total cost of renting vs buying a home.
Depreciation Calculator
Calculate asset depreciation using straight-line method.
Debt Payoff Calculator PRO
Calculate how long to pay off debt and total interest paid.
Interest-Only Loan Calculator
Calculate payments for interest-only loans and compare with standard mortgages.
Refinance Calculator PRO
Find out if refinancing your loan is worth it and calculate savings.
APR Calculator PRO
Calculate the true Annual Percentage Rate including all fees.
Loan Affordability Calculator PRO
Find out how much loan you can afford based on your income.
Monthly Budget Calculator
Track income and expenses with the 50/30/20 rule.
Margin Calculator PRO
Calculate profit margin, markup, and selling prices.
Cashflow Calculator
Track monthly income and expenses with savings rate analysis.
Startup Runway Calculator
Calculate how many months your startup can operate before running out of cash.
Price Markup Calculator
Calculate selling prices, profit margins, and markup from cost.
Inventory Cost Calculator
Calculate the real cost of holding inventory including capital and storage.
Frequently Asked Questions
- What financial calculators are available on Calculy?
- Calculy offers over 20 free financial calculators covering loans, mortgages, compound interest, inflation, ROI, salary conversions, car loans, savings goals, leasing, debt payoff, refinancing, APR, loan affordability, budgeting, profit margins, and cashflow analysis. Many of these are PRO-level tools with advanced features like scenario comparison, interactive charts, amortization schedules, and CSV export. All calculators work with US and UK financial conventions and require no sign-up or account creation.
- How accurate are these financial calculators?
- Our calculators use the same mathematical formulas that banks and financial advisors rely on — standard amortization formulas, compound interest equations, and NPV/IRR calculations. The results are mathematically precise based on the inputs you provide. However, real-world outcomes may differ due to variable interest rates, fees not accounted for, tax implications, or changes in market conditions. We recommend using the results as a solid starting point for financial planning, then consulting a professional for decisions involving large sums.
- Do I need to create an account to use the calculators?
- No, absolutely not. All calculators on Calculy are completely free and require no registration, email address, or personal information. Your calculations run entirely in your browser — no data is sent to any server. Some PRO calculators offer optional localStorage saving so you can return to previous calculations, but this is stored locally on your device and never transmitted elsewhere. We believe financial tools should be accessible to everyone without barriers.
- Which calculator should I use for comparing loan offers?
- For a straightforward loan comparison, start with the Loan Payment Calculator PRO — it supports both annuity and decreasing payment schedules, lets you simulate overpayments, and compare two scenarios side by side. If you specifically need to understand the true cost including all fees, the APR Calculator shows the effective annual rate. For mortgages, the dedicated Mortgage Calculator handles down payments, PMI, and full amortization schedules. And if you are considering refinancing an existing loan, the Refinance Calculator computes the break-even point and total savings.
- Can I use these calculators for business financial planning?
- Yes. Several calculators are designed with business use cases in mind. The Break-even Calculator helps determine when a product or service becomes profitable. The Margin Calculator computes profit margins, markup, and selling prices across five modes. The Cashflow Calculator tracks monthly income and expenses with savings rate analysis. The Startup Runway Calculator estimates how many months your business can operate before running out of cash. And the Inventory Cost Calculator reveals the true cost of holding stock, including tied-up capital and storage expenses.