Financial Calculators for Interest, ROI & Margins
Don't pay for financial calculators. Compute VAT, ROI, profit margins, loan payoffs, and mortgage plans — with professional precision. Make confident money decisions without sharing your financial data with third-party servers.
Make informed financial decisions. Calculate interests, profit margins, and investment projections. Tools designed for entrepreneurs and analysts who need quick, reliable answers for their spreadsheets.
Budget Planner (50/30/20)
Plan your monthly budget using the 50/30/20 rule with customizable categories and expense tracking.
Burn Rate / Runway Calculator
Calculate your startup's monthly burn rate, net burn, and cash runway with month-by-month projections.
Cash Change Calculator
Calculate the exact change to return in bills and coins for any currency.
Credit Card Payoff Calculator
Calculate how long it takes to pay off your credit card and how much interest you'll pay.
Convert Currencies
Convert between 50+ world currencies with live exchange rates. Supports USD, EUR, GBP, JPY, CHF, CAD, AUD, CNY, INR, MXN, BRL, KRW, SGD, HKD, NOK, SEK, PLN, TRY, ARS, COP, CLP, PEN and more. Input: '10 EUR to USD' or '100 dollars to euros'. Also handles currency symbols ($, €, £, ¥).
DCA Calculator (Investment Optimizer)
Optimize your recurring investments using a Softmax-based allocation strategy.
Debt Snowball Calculator
Compare snowball and avalanche debt payoff strategies to find your fastest path to financial freedom.
Discount Calculator
Calculate the final price after applying a discount.
FIRE Number Calculator
Calculate your Financial Independence, Retire Early (FIRE) number and timeline.
Calculate Inflation-Adjusted Values
Calculate how inflation changes the real value of money over time with country-specific rates.
Interest Calculator
Calculate simple and compound interest easily.
Invoice Generator
Create professional invoices with multiple templates, logo upload, and auto-calculations. Download as PDF.
Job Offer Comparison
Compare multiple job offers side by side with weighted scoring to find the best overall package.
Loan Payoff Calculator
Find out when your loan will be paid off.
Margin & Markup Calculator
Calculate profit margin and markup for your products.
Mortgage Calculator
Calculate your monthly mortgage payments with ease.
Net Worth Calculator
Calculate your net worth by tracking assets and liabilities.
Retirement Planner
Plan your retirement savings with projected growth, contribution tracking, and year-by-year breakdown.
ROI Calculator
Calculate your return on investment easily.
Salary After Tax Calculator
Calculate your net pay after taxes and deductions with customizable progressive tax brackets.
Subscription Overload Finder
Track recurring subscriptions, see total costs, and find potential savings.
Tip Calculator
Calculate the tip and split the bill among friends.
VAT Calculator
Calculate VAT (Value Added Tax) for any amount and rate.
Select the right calculator
Compound interest, profit margins, ROI, loan payments: each financial tool addresses a specific question. Pick the one that matches the decision you are trying to make.
Input your financial data
Enter amounts, rates, and periods. The tools accept both annual and monthly rates and convert automatically. Double-check your decimal points; a misplaced dot in finance can mean thousands.
Analyze the results
The output typically includes a summary number plus a breakdown. Interest calculators show year-by-year growth; margin calculators display both markup and margin percentages. Read the full output, not just the headline figure.
Compare scenarios
Change one variable and watch the result update. This is the fastest way to answer questions like "what if the rate drops by 0.5%?" or "how much more do I need to invest to reach my goal in 5 years instead of 10?"
Small Business Owners Setting Prices
The margin calculator shows you the difference between markup and margin; two numbers that sound similar but produce very different pricing strategies. Enter your cost and desired margin; get the selling price. Adjust until the numbers make sense for your market.
Investors Comparing Opportunities
The compound interest calculator lets you model different scenarios side by side. What if the rate is 6% instead of 8%? What if you contribute monthly instead of annually? These questions have precise answers; the tool gives them to you in seconds.
Freelancers Quoting Projects
When a client asks for a fixed price, the ROI and cost calculators help you work backwards from the value you deliver. Enter the hours, your rate, and the overhead; arrive at a quote you can justify with numbers, not gut feeling.
| Tool | Best For |
|---|---|
| Budget Planner (50/30/20) | Plan your monthly budget using the 50/30/20 rule with customizable categories and expense tracking. |
| Burn Rate / Runway Calculator | Calculate your startup's monthly burn rate, net burn, and cash runway with month-by-month projections. |
| Cash Change Calculator | Calculate the exact change to return in bills and coins for any currency. |
| Credit Card Payoff Calculator | Calculate how long it takes to pay off your credit card and how much interest you'll pay. |
| Convert Currencies | Convert between 50+ world currencies with live exchange rates. Supports USD, EUR, GBP, JPY, CHF, CAD, AUD, CNY, INR, MXN, BRL, KRW, SGD, HKD, NOK, SEK, PLN, TRY, ARS, COP, CLP, PEN and more. Input: '10 EUR to USD' or '100 dollars to euros'. Also handles currency symbols ($, €, £, ¥). |
| DCA Calculator (Investment Optimizer) | Optimize your recurring investments using a Softmax-based allocation strategy. |
| Debt Snowball Calculator | Compare snowball and avalanche debt payoff strategies to find your fastest path to financial freedom. |
| Discount Calculator | Calculate the final price after applying a discount. |
| FIRE Number Calculator | Calculate your Financial Independence, Retire Early (FIRE) number and timeline. |
| Calculate Inflation-Adjusted Values | Calculate how inflation changes the real value of money over time with country-specific rates. |
| Interest Calculator | Calculate simple and compound interest easily. |
| Invoice Generator | Create professional invoices with multiple templates, logo upload, and auto-calculations. Download as PDF. |
| Job Offer Comparison | Compare multiple job offers side by side with weighted scoring to find the best overall package. |
| Loan Payoff Calculator | Find out when your loan will be paid off. |
| Margin & Markup Calculator | Calculate profit margin and markup for your products. |
| Mortgage Calculator | Calculate your monthly mortgage payments with ease. |
| Net Worth Calculator | Calculate your net worth by tracking assets and liabilities. |
| Retirement Planner | Plan your retirement savings with projected growth, contribution tracking, and year-by-year breakdown. |
| ROI Calculator | Calculate your return on investment easily. |
| Salary After Tax Calculator | Calculate your net pay after taxes and deductions with customizable progressive tax brackets. |
| Subscription Overload Finder | Track recurring subscriptions, see total costs, and find potential savings. |
| Tip Calculator | Calculate the tip and split the bill among friends. |
| VAT Calculator | Calculate VAT (Value Added Tax) for any amount and rate. |
Yes; completely free. No trials, no premium features behind a paywall.
All calculations happen in your browser. We do not see your income, investment amounts, or interest rates. Nothing is transmitted to any server.
Our tools are accurate calculators, not financial advisors. They compute exactly what the formulas produce. However, real-world factors like taxes, inflation, and fees are not always included. Use the results as one input in your decision-making process, not the only input.
Some do, some do not. The compound interest calculator works with the nominal rate you enter. If you want real returns, subtract your expected inflation rate from the nominal rate before entering it.
Yes. Change any input and the result updates instantly. Open the tool in two tabs if you want a side-by-side comparison of different scenarios.
Each calculator displays its formula. Compound interest uses the standard A = P(1 + r/n)^(nt) equation. Margin calculators use the standard markup and margin formulas. No proprietary or obscure methods.
Not currently. The calculators are designed for interactive browser use. If you need programmatic financial calculations, libraries like financial.js or numpy-financial are better suited.
Convert Currencies
Convert between 50+ world currencies with live exchange rates. Supports USD, EUR, GBP, JPY, CHF, CAD, AUD, CNY, INR, MXN, BRL, KRW, SGD, HKD, NOK, SEK, PLN, TRY, ARS, COP, CLP, PEN and more. Input: '10 EUR to USD' or '100 dollars to euros'. Also handles currency symbols ($, €, £, ¥).
Calculate Inflation-Adjusted Values
Calculate how inflation changes the real value of money over time with country-specific rates.
Invoice Generator
Create professional invoices with multiple templates, logo upload, and auto-calculations. Download as PDF.
Missing something?
Tell us what tool you're looking for and we'll build it for you. We love new ideas!