Estimate a rough heat-loss planning range, not equipment sizing.
Use area and a manually specified heat-loss factor to create a preliminary heat demand illustration.
Enter your numbers
All figures are examples. Replace them with your actual business assumptions.
No information is submitted to our servers by this calculator.
What the calculation includes — and excludes.
NOT for sizing or selecting a furnace: a qualified HVAC professional must perform a jurisdiction-appropriate heat-loss assessment.
Enter the actual measurements, loaded labour rates and material prices from your business. The result is a planning estimate, not an external market benchmark or automatic quote to a customer.
- Measure the job and select realistic unit assumptions.
- Include time, materials, travel and business overhead.
- Confirm gross margin versus markup, then review any taxes and local obligations.
- Use the estimate generator to create an itemised client document.
Answers before you commit.
Are these financial estimates professional tax or accounting advice?
No. Calculators provide illustrative arithmetic based on your entries. Confirm costs, taxes and local rules with qualified professionals.
Does this calculator use my private ZelvotriX data?
No. This free calculator uses the numbers entered on the public page; it does not access company accounts or payment information.
Are results guaranteed or tax advice?
No. Results are arithmetic estimates using your assumptions and may exclude travel, materials, insurance, taxes or other business expenses.
How accurate is this calculator?
Results depend on the measurements, product specifications and business costs you enter. No published market rate or private customer record is used.
Can I send this result to a customer as a binding quote?
Treat the result as a draft. Confirm the scope, local rules, quantities, taxes and margin before preparing a formal estimate.