Calculated Formula & Live Math Engine
Embed live spreadsheet formulas directly inside client-facing documents and invoices.
Eliminate manual calculation mistakes. Reference dynamic field values like {hours} * {hourly_rate} - {retainer_deposit} with instant live recalculation in the browser.
DocFlexa workspace
Calculated Formula & Live Math Engine
Mathematical functions: SUM, AVG, ROUND, MIN, MAX, CONCAT, and arithmetic operators
Instant reactive recalculation on every keystroke via formula-evaluator engine
Formatted currency outputs with customizable locale and decimal precision
Dual-Audience Architecture
How it powers both Personal Life and Business Workspaces
Instantly sum security deposits + first month rent, compute split roommate utility bills, or calculate vehicle repair expenses.
- Auto-calculate move-in totals with pet deposits and cleaning fees
- Calculate split household expenses and contractor milestones
- Prevent accidental underpayment or overpayment disputes
Quote clients with live tiered package pricing, rush fee add-ons, retainers, and milestone progress draws.
- Live contract total updates as clients toggle optional service tiers
- Calculate progress draws: {phase_fee} minus {prepaid_retainer}
- Zero calculation discrepancies between client proposal and signed PDF
Step-by-Step Architecture
How this workflow executes end-to-end
Define Field Keys
Assign variable keys like 'subtotal', 'tax_rate', 'discount_percent'.
Write Formula
Write expressions like ROUND({subtotal} * (1 + {tax_rate} / 100) - {discount_amt}, 2).
Live Client Preview
Watch numbers update reactively as users type or change selections.
Tamper-Evident Lock
Final calculated totals are sealed into the document audit log upon completion.
Technical Architecture
Live Formula Expression Evaluation
// Live Client Milestone Formula:
const formula = "{phase_budget} * (1 + {rush_fee_pct}/100) - {prepaid_deposit}";
// Evaluation with active form state:
// phase_budget = 4000, rush_fee_pct = 15, prepaid_deposit = 1000
const netDue = evaluateFormula(formula, formState); // => $3,600.00Frequently Asked Questions
Everything you need to know
Can clients edit the calculated field directly?
No, calculated fields are read-only and automatically computed from their dependent input fields to ensure mathematical integrity.
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