All the Calculators & Tools
You'll Ever Need
Powerful, easy-to-use calculators for business, finance, e-commerce, real estate, investing and everyday life.
- Business14 calculators
- E-commerce12 calculators
- Real Estate10 calculators
- Investing10 calculators
- Tax10 calculators
- FinanceComing soon
- HealthComing soon
- EverydayComing soon
66 calculators live today — more categories on the way.
Business calculators
Business Valuation
Estimate your company's value with revenue, EBITDA and SDE multiples, adjusted for growth and risk.
Open calculatorSmall Business Valuation
A simpler valuation for owner-operated businesses, based on SDE and seller's discretionary earnings.
Open calculatorBusiness Profit
Turn revenue and expenses into gross, operating and net profit with clear margins and a visual breakdown.
Open calculatorBreak-Even
Find the units and revenue you need to cover costs and reach a target profit.
Open calculatorStartup Valuation
Estimate a startup's indicative value from ARR, revenue, growth and churn.
Open calculatorCompany Valuation
Estimate an established company's value with revenue, EBITDA and SDE multiples.
Open calculatorEBITDA
Calculate EBITDA and EBITDA margin from net income or operating profit.
Open calculatorSDE
Calculate Seller's Discretionary Earnings and an indicative business value.
Open calculatorBusiness ROI
Calculate ROI and annualized ROI on a business investment.
Open calculatorBusiness Margin
Calculate gross, operating and net profit margins from revenue and costs.
Open calculatorRevenue Growth
Calculate revenue growth rate, CAGR and project future revenue.
Open calculatorBusiness Loan
Work out loan payments, total interest and a full amortization schedule.
Open calculatorBusiness Loan Payment
Estimate your monthly loan payment, or the loan amount you can afford.
Open calculatorCash Flow
Project net cash flow and your ending cash balance from inflows and outflows.
Open calculatorE-commerce & Marketing calculators
E-commerce Profit
Calculate net profit, margin, break-even price and maximum ad spend for a product.
Open calculatorAmazon FBA Profit
Estimate Amazon referral and FBA fees, net profit, margin and ROI across five marketplaces.
Open calculatorROAS
Calculate return on ad spend and estimate profit after advertising.
Open calculatorBreak-Even ROAS
Find the minimum ROAS that covers your costs, from your contribution margin.
Open calculatorProfit Margin
Calculate profit, margin and markup from revenue and cost.
Open calculatorGross Margin
Calculate gross profit and gross margin, or solve in reverse.
Open calculatorContribution Margin
Work out contribution margin per unit, % and break-even units.
Open calculatorAOV
Work out average order value and the revenue impact of raising it.
Open calculatorE-commerce CAC
Calculate e-commerce customer acquisition cost, CAC % of AOV and LTV:CAC.
Open calculatorE-commerce LTV
Estimate e-commerce customer lifetime value from AOV and repeat purchases.
Open calculatorDiscount
Work out sale price, savings and true stacked-discount percentages.
Open calculatorProduct Pricing
Find a profitable selling price from costs, fees, ads and target margin.
Open calculatorReal Estate calculators
Rental Property ROI
Estimate cash flow, cash-on-cash and total ROI for a financed rental, including sale.
Open calculatorRental Yield
Work out gross and net rental yield, or the rent needed for a target yield.
Open calculatorCap Rate
Compute capitalization rate from NOI and value, or solve for value or NOI.
Open calculatorCash-on-Cash Return
Measure annual pre-tax cash flow against the cash you actually invested.
Open calculatorDSCR
Work out debt service coverage ratio, or the debt supportable at a target DSCR.
Open calculatorProperty Cash Flow
Estimate monthly and annual rental cash flow after expenses and mortgage.
Open calculatorGRM
Compute the gross rent multiplier, or solve for price or rent.
Open calculatorProperty Appreciation
Project future property value from an assumed appreciation rate.
Open calculatorReal Estate ROI
Combine cash flow, appreciation and sale into total ROI on cash invested.
Open calculatorHouse Affordability
Estimate the home price you can afford from income, debts and down payment.
Open calculatorInvesting & Personal Finance calculators
Compound Interest
Project growth from an initial amount, rate, compounding and regular contributions.
Open calculatorInvestment Return
Work out total return, gain and annualized return on an investment.
Open calculatorCAGR
Compute compound annual growth rate, or solve for value or years.
Open calculatorSIP
Estimate the future value of regular monthly investments, with step-up.
Open calculatorLump Sum Investment
Estimate the future value of a one-time investment over time.
Open calculatorDividend
Estimate dividend income and reinvestment growth from shares or yield.
Open calculatorStock Profit
Calculate profit or loss from buying and selling shares, with fees.
Open calculatorInflation
See how inflation changes future prices and purchasing power.
Open calculatorRetirement
Estimate retirement savings, the corpus needed and any shortfall.
Open calculatorNet Worth
Add up assets and liabilities to find your net worth and ratios.
Open calculatorTax calculators
Income Tax
Estimate income tax with a progressive bracket breakdown, marginal and effective rates.
Open calculatorSelf-Employment Tax
Estimate self-employment tax and income tax on your business profit.
Open calculatorCapital Gains Tax
Estimate short-term and long-term capital gains tax from cost basis and sale price.
Open calculatorSales Tax
Add or remove sales tax, with state, local and special-district components.
Open calculatorProperty Tax
Estimate annual property tax from value, assessment ratio and your local rate.
Open calculatorTax Bracket
See how progressive brackets apply to your taxable income, bracket by bracket.
Open calculatorTake-Home Pay
Estimate net pay after income tax, payroll taxes and deductions.
Open calculatorPayroll Tax
Estimate employee and employer payroll taxes and total employment cost.
Open calculator1099 Tax
Estimate self-employment and income tax on 1099 income, plus a set-aside.
Open calculatorQuarterly Tax
Estimate annual tax and a suggested quarterly estimated payment.
Open calculatorGenuinely useful
Every calculator uses transparent formulas and shows its working, not a black box.
Private by design
Calculations run in your browser. We don't require an account and don't store your numbers.
Built to expand
A growing library of business, e-commerce and finance tools, with more added regularly.
What CalcBundle is
CalcBundle is a free library of 66 business, finance, real estate, investing and tax calculators built for people who want a clear answer and the reasoning behind it. Each tool takes the inputs you already know — a price, a rate, an income, a purchase — and returns the number you need along with a breakdown of how it was reached. There are no sign-ups, no paywalls and no data collection: every calculation runs in your browser and nothing you type is stored or sent anywhere.
We built CalcBundle because most online calculators either hide their formula or bury the result under adverts and pop-ups. Ours show the formula, label every assumption, and mark results as estimates so you always know what the number means and what it does not.
How to get the most from these calculators
Start with the category that matches your question. Business calculators help you value a company, work out profit and break-even, and size a loan. Investing and personal finance tools project compound growth, SIPs, retirement corpus and net worth. Real estate tools estimate rental yield, cap rate, cash flow and how much house you can afford. Tax tools estimate income, self-employment, capital gains, payroll and sales tax for the year and filing status you choose. Because the formulas are visible, you can change one input at a time to see exactly what moves the result — the fastest way to build intuition for how the maths behaves.
Estimates, not advice
Every result on CalcBundle is an estimate based on the figures and assumptions you enter. Interest rates, investment returns, inflation, tax rules and market values change, and your own circumstances are unique. Use these tools to plan, compare options and sanity-check the numbers — then confirm anything important with a qualified professional. Tax figures cover specific years and jurisdictions, which are shown near each calculator so you never mix one year's rules with another's. You can read more about how we build and review these tools in our editorial policy.