50 free calculators for the numbers someone always asks you for

Working capital, inventory, shop floor, pricing, ERP business cases — every formula shown, every calculation done in your browser. Nothing you type leaves your machine, and nothing here needs an account.

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50 tools

Cash & receivables

Collections, payment terms and the working-capital numbers your CFO asks for.

DSO calculatorCalculate days sales outstanding from your AR and credit sales. See days beyond terms, cash tied up in receivables, and what each day of improvement is worth.
DPO calculatorCalculate days payable outstanding from your AP and COGS. See how far you sit from supplier terms and what five more days of DPO is worth in cash.
Cash conversion cycle calculatorWork out your cash conversion cycle from day figures or raw balances. See CCC, working capital funded, and the cash a five-day move in each leg frees.
AR aging calculatorPaste your open invoices with days overdue to get AR aging buckets, percentage mix, weighted average days overdue and a suggested bad debt reserve.
CEI calculatorCalculate your collection effectiveness index from beginning AR, credit sales and ending receivables. See what you collected against what was collectable.
Early payment discount calculatorWork out the annualised cost of 2/10 net 30 from either side, compare it to your cost of capital, and get a clear take-it-or-leave-it answer.
Late payment interest calculatorCalculate interest on an overdue invoice using simple or daily-compound accrual. See the daily rate, interest per day, and the total now due.
Bad debt reserve calculatorSize your bad debt reserve from ageing-bucket loss rates, see it as a percent of AR, and compare it against a flat percent-of-sales provision.
Working capital calculatorCalculate working capital from your current assets and liabilities. Get current ratio, quick ratio, working capital as a % of revenue and days of coverage.

Inventory & supply chain

Order quantities, buffers, coverage and the cost of getting them wrong.

Manufacturing & operations

Shop-floor efficiency, cost rollups and variance analysis.

Pricing & margin

Margin, markup, break-even and what a discount really costs.

ERP business case

Cost, ROI and effort models for ERP projects — built on your own numbers.

Data & NetSuite utilities

Small, sharp utilities for people who live in ERP data all day.

The calculator is the easy half

Every tool on this page takes seconds once you have the inputs. Finding the inputs is the part that eats an afternoon — closing AR net of credit notes, credit sales with cash sales stripped out, average inventory at cost, good units against ideal cycle time, all of it sliced by subsidiary and site. That data already sits in your ERP. Getting it out is the problem.

ERPray closes that gap: ask in plain English, get the number computed live from your own account, with the exact query shown underneath so you can check the definition rather than trust it.

Skip the spreadsheet. Ask your ERP directly.

These calculators need you to find the inputs. ERPray finds them for you — grounded in your own account, with the query shown every time. Free plan at launch.

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