Tools

Free Business Tools

Free online calculators for invoicing and accounting — ready to use instantly.

Time Decimal

Time ⇄ Decimal Converter

Convert between hours:minutes and decimal time. Useful for timesheet and project hour calculations in Excel.

Withholding Tax

Calculate Japanese withholding tax and net payment from gross fees. Reverse calculation also supported.

Payment Term

Calculate payment due dates from invoice date and terms like 'end of month, next month end'. For cash flow planning.

Consumption Tax

Supports 10% / 8% (reduced rate). Choose tax-exclusive or inclusive mode and rounding method.

Prorate

Calculate prorated amounts from monthly fees and usage period. For mid-month subscription changes.

Stamp Duty

Instantly calculate Japanese stamp duty from document type and contract amount. For pre-issuance verification.

Delay Compensation

Calculate late payment interest on overdue receivables. Preset rates for statutory 3%, commercial 6%, subcontractor 14.6%.

Break Even Point

Calculate how much revenue you need to cover fixed and variable costs. For business plans and financial analysis.

Amount in Words

Convert numbers to "One thousand dollars only" format. For English invoices, checks, and bank transfer documents.

Invoice Terms Translator

Paste Japanese invoice text to bulk-translate 80+ common billing terms to English.

Payment Terms (EN)

Calculate due dates from English payment terms like Net 30, 2/10 Net 30, EOM, and early payment discounts.

Incoterms

Instantly check seller/buyer cost responsibilities and risk transfer points for all 11 Incoterms rules.

Chinese Amount

Convert numbers to formal Chinese numeral (大写) notation. Essential for invoices to China, Taiwan, and Hong Kong.

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