Free Tools for Shop Owners

Calculators and tools to help you run your kirana store better.

Use our guides for context: Kirana margin, Udhar management, Expiry prevention.

Inventory

• Reorder Point Calculator

  Lead time + daily sales = when to reorder.

• EOQ Calculator

  Optimal order quantity. Demand, order cost, holding cost.

• Safety Stock Calculator

  Buffer for demand spikes and supplier delays.

• Inventory Turnover Calculator

  COGS ÷ avg inventory. How fast you sell stock.

• Days of Stock Calculator

  How long current stock lasts at current sales.

• Carrying Cost Calculator

  Cost of holding inventory. Value × holding %.

• Expiry Countdown Calculator

  Days until expiry date.

Billing & GST

• GST Calculator

  CGST, SGST, IGST. Forward or reverse calculation.

• Free Invoice Generator

  Create GST invoices. Download PDF. No signup.

• HSN Code Finder

  Search HSN codes by product name.

• Tax Inclusive / Exclusive Calculator

  Add or remove GST from price.

• GSTIN Format Validator

  Check if GSTIN format is valid.

Finance & Pricing

• Profit Margin Calculator

  Cost, selling price → margin %, markup %, profit.

• Markup Calculator

  Cost + markup % → selling price.

• Break-even Calculator

  Units to cover fixed and variable cost.

• Discount Calculator

  Original price, % off → sale price.

• Percentage Calculator

  X% of Y, or % change between values.

• Price Per Unit Calculator

  Total price ÷ quantity.

• TDS Calculator

  Amount, TDS % → net amount.

• EMI Calculator

  Principal, rate, tenure → monthly EMI.

• Simple Interest Calculator

  P × R × T.

• Compound Interest Calculator

  Principal, rate, time → maturity.

• FD Calculator

  Fixed deposit maturity amount.

• SIP Calculator

  Monthly SIP, rate, years → maturity.

• ROI Calculator

  Investment, return → ROI %.

Sales & Credit

• Udhar Calculator

  Interest on credit. Principal, rate, days.

• Daily Sales Calculator

  Cash vs udhar. Daily total.

• Credit Period Calculator

  Sale date + credit days → due date.

• Supplier Payment Due Date Calculator

  Purchase date + credit days (Net 7, 15, 30) → due date.

• Overdue Days Calculator

  Days overdue from due date.

• Commission Calculator

  Sale amount × % → commission.

• Daily Target Calculator

  Monthly target ÷ working days.

For contractors

• Daily Wage Calculator

  Labour wages, OT, deductions. Links to Yojo.

• Brick Calculator

  Bricks, cement, sand for walls. Links to Yojo.

• Muster Roll Generator

  BOCW compliant muster roll PDF. Links to Yojo.

Utility

• Unit Converter

  Kg, gram, quintal, liter, ml.

• Number to Words

  Amount in rupees to words (cheques).

• Rupee Format Converter

  Number → ₹12,345.00 format.

• Age Calculator

  DOB → age in years, months, days.

• Date Difference Calculator

  Days between two dates.

Guides – Kirana profit margin, udhar management, stock expiry prevention. Many tools support embed—add calculators to your blog with an iframe (see each tool page).