Free invoice calculators and planners for freelancers and service teams.

Calculate invoice due dates from an invoice date and payment terms, with optional weekend handling.

Calculate subtotal, tax amount, and invoice total using a custom VAT or tax rate.

Turn an hourly rate and planned hours into an invoice subtotal, tax amount, and total.

Estimate flat fees, overdue interest, and the updated amount due on a late invoice.

Plan monthly invoice send dates and see what happens when the selected day lands on a weekend.

Estimate what an invoice total looks like in a target currency using a custom exchange rate.

Plan the next invoice numbers in a sequence so recurring invoices and manual numbering stay organized.

Compare an hourly billing total against a fixed monthly retainer to see which invoice amount makes more sense.

Plan overdue payment reminders using the same timing rules as InvoiceAgent. Copy or download your schedule.

Estimate how much time and admin cost manual invoice chasing creates each month.

Split a project subtotal across three agreed milestones, with percentages that total 100% and amounts that reconcile to the cent.

Calculate a partial-period retainer using inclusive calendar days within a billing period you define.

Calculate an agreed early-payment discount, the reduced payment amount, and its calendar-day deadline.

Subtract up to three confirmed receipts from an invoice total and identify the remaining balance or overpayment.

Group three open invoice balances into current, 1–30, 31–60, 61–90, and 91+ day buckets as of a chosen date.

Add three approved client expenses and an agreed markup to calculate a reimbursement subtotal in one currency.

Split an existing invoice balance into 2–24 equal installments with exact cent reconciliation and fixed calendar-day dates.

Reconcile included hours, authorized rollover and confirmed usage, then check unused hours and a possible overage subtotal.

Compare already-billed and proposed charges with an approved project or PO cap, showing remaining headroom and any excess.

Compare three quantity × price lines rounded individually with a subtotal rounded once after aggregation.

Estimate a single payment's percentage fee, flat fee and net settlement using rates you enter.

Measure billable hours against your available service hours and compare them with a target you choose.

Compare rounding three time entries up individually with rounding their combined minutes up once, using an increment you enter.

Calculate a weighted hourly rate from three work groups, retaining each group's hours, rate and rounded subtotal.

Compare three reviewed invoice totals with an independently prepared expected batch total and show the signed difference.

Check whether three proposed invoice allocations fit within one confirmed receipt, showing any unallocated remainder or excess allocation.

Reconcile a verified opening service advance, confirmed top-up and three approved applications, showing remaining funds or excess application.

Compare an agreed fixed fee against estimated and actual delivery hours, showing the implied rates and hours variance.

Measure issue-to-full-payment calendar days for three paid invoices, comparing mean, median and amount-weighted sample averages.

Build a suggested PDF filename from a short client label, invoice ID, issue date and version, with normalized separators.

Compare two inclusive service-date intervals and identify their shared calendar dates and day count.

Convert whole hours and minutes to decimal hours, and separately convert entered decimal hours to a duration rounded to the nearest minute.

Reconcile an original invoice, approved credits and confirmed allocated cash, separating the remaining amount from excess cash applied.

Compare current and proposed fees for equivalent full periods, showing the signed change and totals over a chosen number of periods.

Convert a non-negative two-decimal invoice amount into an English currency phrase and a whole-unit plus hundredths version.

Compare a contract subtotal's approved cumulative completion value with prior billed subtotals to identify a current progress-billing difference.

Compare a draft service subtotal with an accepted quote plus approved additions and reductions, showing a signed unexplained difference.

Split a known tax-inclusive amount into an illustrative before-tax amount and tax component using one entered percentage rate.

Compare percentage-then-fixed and fixed-then-percentage discounts on the same eligible subtotal, showing their different bases and final amounts.

Compare an entered-rate settlement equivalent with one confirmed gross receipt, retaining currency direction and a signed amount difference.

Reconcile a current retention deduction, cumulative lifetime cap and approved release while keeping the unreleased balance separate from cash receipt.

Plan an internal invoice-review date by counting Monday–Friday weekdays after submission, excluding the submitted date and leaving holidays for separate review.

Estimate Base64 attachment size plus an entered message allowance against a stated MiB budget, without uploading files or assuming an email provider's limits.

Calculate three entered clients' shares of one defined portfolio billing subtotal and reconcile the unlisted remainder on a consistent period and currency basis.

Compare an agreed day rate with its hourly equivalent using entered day hours and week days, showing rounding drift without changing the contractual billing basis.

Estimate internal invoice-processing effort from entered preparation, review and incremental exception minutes, with an explicit hourly cost and per-invoice comparison.

Check an entered purchase-order reference against a stated character-count limit and an explicit ASCII character policy without altering its original text.

Calculate whole service packs needed for an entered quantity, their covered and surplus units, and an agreed per-pack subtotal without assuming partial packs are billable.

Calculate first-submission rejection share for a defined invoice cohort and reconcile resolved and unresolved rejected invoices at one review cutoff.

Plan paper sheets for separate invoice packs using entered invoice pages, supporting pages, copy count and one- or two-sided printing.

Plan how many priority and routine invoice follow-up reviews fit an entered minutes budget, using a stated priority-first allocation and separate per-case estimates.

Reconcile a defined recurring-agreement inventory into reviewed active setups, reviewed paused setups and records whose setup is still unresolved.