Ecommerce & Payroll Calculators
55 free business calculators: Amazon FBA fees, Shopify and Etsy margins, shipping and inventory, ROAS and CAC — plus paycheck, federal tax, 1099 and small-business finance tools. Every formula shown, nothing uploaded.
E-commerce Seller Tools
Amazon FBA Fee Calculator
Estimate Amazon referral and FBA fulfilment fees, then see net profit per unit and your real margin.
Calculate →SHOPIFYShopify Profit Calculator
Per-order profit after COGS, shipping, payment processing and your Shopify plan costs.
Calculate →ETSYEtsy Fee Calculator
Listing, transaction, payment and offsite-ad fees on one screen, with profit after cost.
Calculate →PRICINGProduct Pricing Calculator
Work out the price you need from a target margin or markup, plus a margin ladder for comparison.
Calculate →BREAK-EVENBreak-Even Calculator
Units and revenue needed to cover fixed costs at a given price and variable cost.
Calculate →ROIROI Calculator for Ecommerce
Return on investment from revenue and cost, with profit and multiple shown together.
Calculate →PROFITNet Profit Calculator
Revenue down to net profit through COGS, operating expenses and tax, with both margins.
Calculate →MARGINGross Margin Calculator
Gross margin and markup from revenue and COGS, side by side so the difference is obvious.
Calculate →MARKUPMarkup Calculator
Selling price from cost and markup percentage, with the resulting margin shown for contrast.
Calculate →DISCOUNTDiscount Percentage Calculator
Final price and savings from a discount percentage, plus the implied discount between two prices.
Calculate →SHIPPINGShipping Cost Calculator
Estimate parcel shipping from weight and zone, with fuel surcharge broken out.
Calculate →DIMDimensional Weight Calculator
Billable weight from box dimensions and actual weight, across all three common divisors.
Calculate →INVENTORYInventory Turnover Calculator
Turnover ratio and days inventory outstanding from COGS and average inventory.
Calculate →REORDERReorder Point Calculator
The stock level that triggers a reorder, based on daily sales, lead time and safety stock.
Calculate →LEAD TIMELead Time Calculator
Total replenishment lead time from ordering, production, shipping and buffer days.
Calculate →PACKAGINGPackage Size Estimator
Recommended box dimensions from product size plus cushioning, with volume and DIM weight.
Calculate →FREIGHTFreight Class Calculator
Density-based NMFC freight class estimate from weight and carton dimensions.
Calculate →ROASROAS Calculator
Return on ad spend with the break-even ROAS that matches your margin.
Calculate →CPCCPC Bid Calculator
Maximum cost per click from your target CPA and conversion rate.
Calculate →CVRConversion Rate Calculator
Conversion rate from orders and sessions, with the sessions-per-order view.
Calculate →CACCustomer Acquisition Cost Calculator
Blended CAC from total acquisition spend and new customers acquired.
Calculate →LTVCustomer Lifetime Value Calculator
LTV from average order value, purchase frequency, lifespan and gross margin — plus LTV:CAC.
Calculate →EMAILEmail Open Rate Calculator
Open rate, click-through and click-to-open from a campaign's sends, opens and clicks.
Calculate →SOCIALSocial Media Engagement Calculator
Engagement rate from interactions and reach, benchmarked against typical ranges.
Calculate →TAXSales Tax Calculator
US sales tax from a base amount, state rate and local rate, with the combined rate shown.
Calculate →VATVAT Calculator
Add VAT to a net amount or extract it from a gross figure, in one tool.
Calculate →GSTGST Calculator
Goods and services tax for Australia, Canada, India, Singapore and New Zealand.
Calculate →DUTYImport Duty Calculator
Duty on the CIF value plus total landed cost for an import shipment.
Calculate →CUSTOMSCustoms Clearance Calculator
Full clearance cost: duty, import VAT/GST and broker fees on one landed-cost line.
Calculate →10991099 Tax Estimator
Self-employment tax plus federal income tax on 1099 income, with quarterly payment amounts.
Calculate →SE TAXSelf-Employment Tax Calculator
Just the 15.3% Social Security and Medicare tax on self-employed net profit.
Calculate →Financial & Payroll Calculators
Hourly Wage Calculator
Convert an hourly rate into weekly, monthly and annual pay, with the hours assumptions made explicit.
Calculate →SALARYSalary to Hourly Converter
Turn an annual salary into an hourly rate using your real working hours.
Calculate →PAYCHECKPaycheck Calculator
Take-home pay after federal income tax, FICA and state tax, per paycheck and per month.
Calculate →FEDERALFederal Income Tax Calculator
Federal tax by bracket with marginal and effective rates, using 2025 brackets and deductions.
Calculate →STATEState Income Tax Calculator
State income tax from a preset rate or your own, with the no-tax states flagged.
Calculate →FICASocial Security Tax Calculator
The 6.2% Social Security portion, capped at the annual wage base.
Calculate →MEDICAREMedicare Tax Calculator
The 1.45% Medicare tax plus the 0.9% additional tax above the high-income threshold.
Calculate →OVERTIMEOvertime Pay Calculator
Weekly pay with regular, time-and-a-half and double-time hours separated.
Calculate →BONUSBonus Tax Calculator
Withholding on a bonus under the 22% supplemental rate or the aggregate method.
Calculate →BUDGETSmall Business Budget Calculator
Monthly budget from revenue and six expense categories, with each line as a share of revenue.
Calculate →CASH FLOWCash Flow Forecast Calculator
Project month-by-month cash from a starting balance plus monthly inflows and outflows.
Calculate →BURNBurn Rate Calculator
Monthly net burn and runway from cash movement and current reserves.
Calculate →STARTUPStartup Cost Calculator
First-year funding need from one-time setup plus recurring monthly costs.
Calculate →LOANBusiness Loan Calculator
Monthly payment and total interest for a fixed-rate business loan.
Calculate →INTERESTInterest Rate Calculator
Simple versus compound interest, with the effective annual rate for each compounding frequency.
Calculate →AMORTAmortization Schedule Generator
Full amortization with the first 12 payments and interest by year, plus totals.
Calculate →DEPRECIATIONDepreciation Calculator
Straight-line or double-declining depreciation for equipment and vehicles.
Calculate →FREELANCEFreelance Rate Calculator
The hourly rate you need to hit a target income after costs and self-employment tax.
Calculate →CONTRACTORContractor Hourly Rate Calculator
Contract rate from desired take-home, self-employment tax and overhead.
Calculate →1099/W21099 vs W-2 Calculator
Net income comparison between contract and employee work at the same gross pay.
Calculate →SELF-EMPSelf-Employed Income Calculator
Net profit and post-SE-tax income from revenue and business expenses.
Calculate →INVOICESInvoice Payment Tracker
Paste invoices with amounts and days overdue to see outstanding, overdue and 30+ day totals.
Calculate →EXPENSESExpense Reimbursement Calculator
Mileage plus itemised expenses totalled for a reimbursement claim.
Calculate →RETIREMENTRetirement Contribution Calculator
Projected balance from monthly contributions, employer match and compounding, with 2025 limits.
Calculate →