Finance
Loans, savings, growth and ROI.
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CalcHarbor
Financial calculators with the math in view.
Business and finance calculators that show the formula, explain the result and solve the basic question without signup.
CalcHarbor
Popular calculators
Open the calculators people use most for loan cost, break-even volume, gross margin and ROI checks.
FinanceLoan Payment CalculatorEstimate monthly payment, total paid and interest with the amortization formula visible.BusinessBreak-even Point CalculatorFind the unit volume needed for contribution margin to cover fixed costs.BusinessGross Margin CalculatorCalculate gross profit, gross margin and markup from revenue and direct cost.FinanceROI CalculatorCalculate net return and return on investment with a transparent formula.
Scenario planner
Compare one calculator across three assumptions.
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Directory
Browse by category
Use the directory to jump from finance math to business, commerce, time-based and unit-based planning calculators.
Business
Break-even, margin and cash runway.
Marketing
Return, margin and volume planning.
Commerce
Discount, price, unit cost and margin.
Time/Date
Terms, months to goal and runway windows.
Units
Unit volume, quantity and per-unit economics.
CalcHarbor
All calculators
Every calculator below gives a complete free answer, formula, interpretation and scenario range.
FinanceBrowser-side
Loan Payment Calculator
Estimate monthly payment, total paid and interest with the amortization formula visible.
- Free result
- Monthly payment, total paid, total interest and formula.
- Optional account features
- Saved loan scenarios, comparison exports, team review and API.
FinanceBrowser-side
Compound Interest Calculator
Estimate ending balance, interest earned and contributions with monthly compounding visible.
- Free result
- Ending balance, interest earned, total contributions and formula.
- Optional account features
- Saved investment scenarios, comparison exports, recurring reminders and API.
FinanceBrowser-side
Savings Goal Calculator
Estimate how long a target balance takes with current savings, monthly contributions and growth.
- Free result
- Months to goal, years to goal, projected contributions and formula.
- Optional account features
- Saved goals, calendar reminders, exportable plans and API.
BusinessBrowser-side
Break-even Point Calculator
Find the unit volume needed for contribution margin to cover fixed costs.
- Free result
- Break-even units, contribution margin and break-even revenue.
- Optional account features
- Scenario library, exports, product mix widgets and API.
BusinessBrowser-side
Gross Margin Calculator
Calculate gross profit, gross margin and markup from revenue and direct cost.
- Free result
- Gross profit, gross margin, markup and formula.
- Optional account features
- Saved period comparisons, exports, dashboards and API.
BusinessBrowser-side
Cash Runway Calculator
Estimate how many months current cash covers net burn before the balance becomes constrained.
- Free result
- Runway months, net monthly burn, 90-day reserve and formula.
- Optional account features
- Saved runway scenarios, board exports, alerts, team review and API.
BusinessBrowser-side
Discount Price Calculator
Calculate final unit price, order total and savings after a discount and added unit fee.
- Free result
- Final unit price, total order cost, discount savings and formula.
- Optional account features
- Saved deal comparisons, procurement exports, team approvals and API.
FinanceBrowser-side
ROI Calculator
Calculate net return and return on investment with a transparent formula.
- Free result
- Net return, ROI percentage and formula.
- Optional account features
- Saved scenarios, portfolio exports, widgets and API.
Operating principles
Transparent formulas
Each calculator exposes the formula and labels assumptions so the answer is auditable.
In-browser by default
Calculations run in the browser and do not store inputs or results.
Paid value adds convenience
Upgrades are for saved scenarios, exports, widgets, teams, API and no ads, not for revealing the answer.
Support
Keep this free result available
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