Free tools
Construction calculators, free and no login
Quick numbers for the questions that come up on every job: retainage, payment deadlines, lien windows, late-payment interest, and whether a waiver will hold up. Math runs in your browser.
Retainage calculator
Enter contract value, billed to date, and the retainage rate. See what's withheld, what you should have received, and when you can ask for release.
OpenPayment deadline calculator
Pick an invoice date and Net terms. See when payment is due and how late it already is.
OpenLien deadline calculator
Pick a state and the last day of furnishing. Get the mechanic's lien filing deadline to the day, with the notice rules that go with it.
OpenPrompt payment interest calculator
A payment is past due. See the interest accrued, what every extra day costs the payer, and the total owed.
OpenAI lien waiver audit
Upload any waiver PDF and get a state-by-state compliance check in under 30 seconds. Catches void statutory language before it costs you.
OpenThe tool behind the tools
Every calculator on this page exists because a payment stalled somewhere. LienDone fixes the most common cause: send the right statutory lien waiver, your sub signs on their phone in two minutes, and the payment releases on schedule. $49/month flat, 30-day free trial, no card.
LienDone Inc.. Lien waivers signed in minutes, not weeks.