Finance Calculator Hub
Practical finance and accounting tools — proration, depreciation, inventory return, receivables, and workforce metrics. Enter the values you know, get the exact figure you need.
Available Finance Calculators
Prorated Rent Calculator
Calculate prorated rent for a partial month based on days occupied, move-in date, or move-out date. Get the exact daily rate and prorated amount instantly.
Pro Rata Calculator
Calculate a pro-rata (proportional) amount for any partial time period, insurance premium, or ownership share. Get the exact daily rate, percentage, and prorated total instantly.
Accumulated Depreciation Calculator
Calculate accumulated depreciation and book value for any asset using the straight-line or declining balance method. Instant results with a full formula breakdown.
GMROI Calculator (Gross Margin Return on Investment)
Calculate GMROI (Gross Margin Return on Investment) from sales and inventory cost, from beginning/ending inventory, or from gross margin % and inventory turnover. See gross profit earned per dollar of inventory invested.
A/R Days Calculator
Calculate A/R days (accounts receivable days, also called DSO) from ending or average accounts receivable and net credit sales. Get the exact collection period and turnover rate instantly.
Attrition Rate Calculator
Calculate employee attrition rate from headcount, or customer attrition (churn) rate from customer counts. Get the exact rate, retention rate, and formula breakdown instantly.
Average Collection Period Calculator
Calculate the average collection period (average debtors collection period) from accounts receivable and net credit sales. Get the exact number of days and receivables turnover instantly.
HHI Calculator (Herfindahl-Hirschman Index)
Calculate the Herfindahl-Hirschman Index (HHI) from firm market shares, from an equal number of firms, or the HHI change from a merger. See the market concentration level instantly.
Average Variable Cost Calculator
Calculate average variable cost, average fixed cost, average total cost, and total cost from your production quantity and cost figures. Instant results with formula breakdown.
Labor Cost Calculator
Calculate direct labor cost, the true (fully-burdened) cost of an employee including taxes and benefits, or labor cost as a percentage of revenue. Instant results with formula breakdown.
Bradford Factor Calculator
Calculate the Bradford Factor (Bradford Score) from employee absence spells and total days absent. See the concern level instantly, or compare two absence patterns side by side.
Break-Even Calculator
Calculate your business break-even point in units or revenue, or find the Social Security break-even age when comparing early vs. delayed benefit claiming. Instant results with formula breakdown.
Business Budget Calculator
Calculate your monthly business budget, expenses, and profit margin, or split a total budget across operating costs, payroll, marketing, and savings. Instant results with formula breakdown.
Business Valuation Calculator
Estimate what your business is worth using the SDE multiple, EBITDA multiple, revenue multiple, or asset-based (book value) method. Instant results with formula breakdown.
Churn Rate Calculator
Calculate customer churn rate, revenue (MRR) churn, or annualized churn rate from a monthly rate. Instant results with formula breakdown — built for SaaS and subscription businesses.
Payback Period Calculator
Calculate the payback period for an investment from even or uneven annual cash flows, or the discounted payback period accounting for the time value of money. Instant results with formula breakdown.
Consulting Fees Calculator
Calculate your required consulting hourly rate from a target salary, estimate a project-based fee, or set a monthly retainer fee. Instant results with formula breakdown.
Standard Accounting & Finance Formulas
Every formula in our finance calculators follows established accounting and finance conventions. Proration uses the daily-rate method (Amount ÷ Period × Units); receivables metrics follow standard DSO/A/R days formulas; depreciation follows GAAP-recognized straight-line and declining-balance methods.
Read full methodology specificationsPrecision: All calculations run in double-precision floating-point arithmetic directly in your browser. No data is transmitted to any server.