Rekenbox — By Winstwaker

For business owners and employers

Free tools for business owners and employers.

Payslip, cost price, fuel surcharge or sole trader versus limited company: enter your figures and see the result right away, with sources. No account needed.

Find my free tool ↓Browse all tools →

73 free tools · Instant results · With sources

Choose your task

All free tools, by topic.

Calculate, create or check what you need. Start free. Registry checks share a daily allowance; bulk and monitoring use credits.

73 free tools · No account needed

Documents & statements

Record payments, work, expenses and employment.

Financial plans & budgets

Calculate investment, funding, profit and cash together.

Financial ratios & annual figures

Understand your balance sheet, track liquidity and compare performance.

Stock, transport & hospitality

Understand rates, reorder points and menu performance.

VAT & invoices

Convert amounts, create invoices and investigate errors.

Salary & employees

Gross to net, holiday allowance and employer costs.

Business & tax

Set your hourly rate, estimate tax and compare business choices.

Prices, interest & loans

Calculate margins, break-even points and borrowing costs.

Time, car & records

Record hours and journeys and compare private or business car use.

Files & banking

Read XAF and UBL, check CSV and create payment files.

From a single check to your entire records

A small check. A lot of work handled.

Start free with one number or file. Process complete lists with credits, or recheck VAT numbers each month. See the cost before you start.

Check EORI

Ready for the border. Check customs numbers with the European registry.

Start free · Bulk with credits

Monitor VAT numbers

Today and next month. See what changes in your customers’ registrations.

6 credits per checked number

Review suppliers

VAT, EORI and IBAN together. One check overview for your trading partners.

Start free · Bulk with credits

Check IBANs

Find format errors in payment details. One IBAN or a complete list.

Start free · Bulk with credits

Check UBL in bulk

A folder of electronic invoices, one clear overview of technical findings.

Start free · Bulk with credits

Compare invoices

Check amounts and find possible duplicates or different payment details.

Start free · Bulk with credits

Clarity for everyday decisions

What changes with a different choice?

Five practical tools for transport, stock and hospitality. Enter your figures and see how the result changes.

Calculate for free
Calculate fuel surcharge

A rate that moves with costs

Calculate your fuel-price agreement.

Open tool ↗Safety stock & reorder point

Reorder at the right time

From daily demand to buffer and reorder point.

Open tool ↗Inventory turnover

Less money on the shelf

Compare your inventory days with your target.

Open tool ↗Cash conversion cycle

From stock to cash sooner

See the effect of stock and payment terms.

Open tool ↗Menu engineering matrix

A menu that contributes

Discover each dish’s role in your matrix.

Open tool ↗

Move forward with a clear plan

What does the bank need from your figures?

All guides and examples →

Prepare for financing

Forecast for a bank: turn your figures into a supported plan

Preparing a forecast for a bank? See what to collect, a worked example and what an XAF forecast covers. Free preview, PDF €19 per report.

Read the guide

Support your figures

Financial plan for new businesses: four connected budgets

What belongs in a financial plan? Compare investment, financing, operating profit and cash flow. Includes an example and Rekenbox’s scope.

Read the guide

Support your figures

Create a cash-flow budget: when might cash run short?

Preparing a business or bank cash-flow forecast? Follow opening cash, receipts and payments in a monthly example. Understand the difference from profit.

Read the guide