Solarc Labs Finance · margin · cash · invoices · spend
Free finance tools for the numbers operators check every week.
Calculate margin, burn and runway; clean invoice and vendor exports; inspect spreadsheet structure; and prepare invoice PDFs without rebuilding a finance stack for a one-off job.
Profit & cash position
Turn basic operating numbers into a fast margin, burn or runway answer before building a larger model.
Gross Profit Calculator
Calculate gross profit and gross margin from revenue and cost of goods sold.
Contribution Margin Calculator
Calculate contribution per unit and contribution margin percentage.
Monthly Burn Rate Calculator
Calculate simple monthly net burn from cash outflow and inflow.
Cash Runway Calculator
Estimate runway from cash balance and monthly net burn.
Invoice & vendor data
Prepare exports before reconciliation, reporting, migration or an accounting-system handoff.
Invoice CSV → JSON
Turn an invoice export into readable JSON without uploading the file.
Invoice JSON → CSV
Convert structured invoice JSON into a spreadsheet-friendly CSV.
Vendor Spend CSV Cleaner
Clean vendor and renewal exports before spend review or reconciliation.
CSV Column Profiler
Inspect blanks, columns and unique-value counts before importing finance data.
Document preparation
Finish bounded finance-document jobs locally, then move to a paid workflow only when review and evidence repeat.
Free → paid boundary
Pay for repetition and operational ownership, not the first useful answer.
Charge for repeated reconciliation, retained mappings, approvals, audit evidence, integrations, monitoring and supported finance outcomes — not a one-off calculation.