Bookkeeping Calculators
Accounts Payable Days Calculator
Calculate Days Payable Outstanding from accounts payable and cost of goods sold to see how long a business takes to pay its suppliers.
Accounts Receivable Days Calculator
Calculate Days Sales Outstanding (DSO) from accounts receivable and total credit sales to measure how quickly a business collects payment.
Accrued Interest Calculator
Calculate accrued interest on a principal amount over a number of days, for proper accrual-basis bookkeeping entries.
Bad Debt Allowance Calculator
Calculate the estimated allowance for bad debt using the percentage of credit sales method based on historical loss experience.
Bank Reconciliation Calculator
Calculate the adjusted bank balance for a bank reconciliation from the bank statement balance, deposits in transit, and outstanding checks.
Break-Even Point Calculator
Calculate the break-even point in units and revenue from fixed costs, price per unit, and variable cost per unit for a product or service.
Cash Conversion Cycle Calculator
Calculate the cash conversion cycle (CCC) from days inventory outstanding, days sales outstanding, and days payable outstanding.
Cost of Goods Sold Calculator
Calculate Cost of Goods Sold from beginning inventory, purchases, and ending inventory to determine the direct cost of items sold in a period.
Depreciation Calculator
Calculate annual depreciation using either the straight-line method or the declining-balance method, from asset cost, salvage value, and useful life or rate.
Double Entry Balance Calculator
Compare a single debit amount against its matching credit amount to verify a journal entry follows the double-entry bookkeeping rule.
General Ledger Balance Calculator
Sum a list of debit and credit ledger entries to check whether they balance, with the exact variance shown when they don't.
Gross Profit Margin Calculator
Calculate gross profit margin from revenue and cost of goods sold, isolating how efficiently a business produces what it sells.
Inventory Turnover Days Calculator
Calculate Days Inventory Outstanding (DIO) from average inventory and cost of goods sold to measure inventory management efficiency.
Payroll Tax Calculator
Calculate simplified US federal FICA tax from gross pay, including Social Security tax, Medicare tax, and the Additional Medicare surtax where it applies.
Petty Cash Reconciliation Calculator
Reconcile a petty cash drawer by comparing expected cash against actual cash counted, from the starting float and total receipts collected.
Prepaid Expense Amortization Calculator
Calculate the monthly expense to recognize from a prepaid expense using straight-line amortization over its coverage period.
Reverse Sales Tax Calculator
Calculate the pre-tax amount and tax portion from a tax-inclusive total, working backward from the final price charged.
Sales Tax Calculator
Calculate sales tax and the total price due by applying a tax rate to a purchase price, for invoicing, budgeting, or point-of-sale use.
Trial Balance Calculator
Sum debit-balance and credit-balance account totals to check whether a trial balance is in balance before financial statements are prepared.
Unearned Revenue Recognition Calculator
Calculate the revenue to recognize per period from an upfront customer payment for services delivered over time.
Keeping the Books Accurate
Bookkeeping is the ongoing discipline of recording, reconciling, and balancing every transaction a business makes — the foundation that accounting, tax filing, and financial analysis all build on. These ten calculators cover the day-to-day arithmetic bookkeepers rely on.
Two Businesses, Same $50,000, Very Different Risk
Accounts receivable aging is a case where the total balance can hide the real story. Compare these two profiles:
| Age Bucket | Healthy Business | At-Risk Business |
|---|---|---|
| 0-30 days | $40,000 | $10,000 |
| 31-90 days | $8,000 | $15,000 |
| 90+ days | $2,000 | $25,000 |
Same $50,000 total, but the at-risk business has half its receivables aged past 90 days — a strong predictor of bad debt that the total balance alone completely hides. Track your own aging with the Accounts Payable Days Calculator.
Popular Bookkeeping Calculators
- Break-Even Point Calculator — finds the sales volume needed to cover all fixed and variable costs.
- Depreciation Calculator — spreads an asset's cost over its useful life using standard depreciation methods.
- Trial Balance Calculator — confirms total debits equal total credits across the ledger.
Why must debits and credits always balance? Double-entry bookkeeping records every transaction as an equal debit and credit across two accounts, so an unbalanced ledger is effectively a built-in error signal — a mistake exists somewhere in the entries.
See also: Accounting Calculators for higher-level ratios, or Business Calculators for broader planning tools.