Business Calculators: Margins, Fees and Earnings
Running a small business or selling online means watching margins closely. These calculators show what you keep after costs and fees, and how prices change when VAT is added.
Fee calculators use the published fee tables of each marketplace, with the date they were checked.
Profit Margin CalculatorWork out profit, margin and markup from cost and price, or find the price for a target margin.EU VAT CalculatorAdd or remove VAT at the standard or reduced rate of any EU country, with a dated table of rates.Etsy Fee Calculator (UK)Estimate Etsy fees on a UK sale and the profit left, with editable rates.Amazon Seller Fee Calculator (UK)Estimate Amazon UK referral fees, plan fees and profit on a sale, with VAT taken out.YouTube Earnings EstimatorEstimate a monthly and yearly income range from views and an editable RPM for long videos and Shorts.Twitch Earnings EstimatorEstimate monthly income from subscribers, Bits and ads with editable prices and revenue share.NPV and IRR CalculatorWork out the net present value, internal rate of return and payback time of a series of yearly cash flows.ROI CalculatorCalculate return on investment as a percentage, with the gain in pounds and the return per year.Depreciation CalculatorSpread the cost of an asset over its life with straight line or reducing balance depreciation, year by year.Break Even CalculatorFind how many units you must sell to cover your costs, and how many to reach a target profit.Employee Cost CalculatorWork out what an employee really costs you in a year, with employer National Insurance and pension for 2026/27.Late Payment Interest CalculatorWork out the statutory interest and fixed compensation you can claim when another business pays an invoice late.Business Mileage Allowance CalculatorWork out HMRC approved mileage payments, or the flat rate you can claim as self-employed, for the 2026/27 tax year.Working From Home Expenses CalculatorAdd up the simplified expenses flat rate for working from home as self-employed, month by month, and compare it with your actual costs.Unit Economics CalculatorSee what each sale really earns after product cost, fees, shipping and refunds, and the price needed for the margin you want.MRR and ARR CalculatorTurn your plans into monthly and annual recurring revenue, and track how the month moved with expansion and churn.Churn and Retention CalculatorFind your customer churn and retention rate, how long a customer stays, their lifetime value and where your customer count is heading.Net Promoter Score CalculatorTurn survey scores from 0 to 10 into your Net Promoter Score, with the split of promoters, passives and detractors and a margin of error.Payment Terms Due Date CalculatorFind the due date for net 30, 30 days from month end, end of next month and other payment terms, with early payment discount dates.12 Month Cash Flow ForecastBuild a 12 month cash flow forecast with money in and out, growth, one-off and quarterly payments, and see when the balance dips.Meeting Cost CalculatorSee what a meeting costs as it happens, from the salaries of everyone in the room, with a running total you can start and stop.Reorder Point and Safety Stock CalculatorWork out when to reorder stock, how much safety stock covers the risk of running out, and the order size that keeps costs lowest.
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