Cooktop BTU to CFM Calculator

Plan a quieter hood with smarter airflow settings. Save results as CSV and a PDF report.

Calculator inputs
Enter cooktop heat output, then refine with hood and duct details.
White theme • Responsive grid
Use BTU/h for gas specs, kW for electric ratings.
Sum of all burners, or the nameplate total.
Converted internally using 1 kW = 3412.142 BTU/h.
Wider cooktops may need more capture airflow.
Island and downdraft usually need extra airflow.
Heavier cooking increases smoke and grease load.
Longer ducts can reduce effective airflow.
More elbows create pressure loss and noise.
Fewer fittings helps real delivered airflow.
Smaller ducts can choke flow at higher CFM.
Filters change resistance and cleaning frequency.
High airflow may require replacement air supply.

Formula used

This tool uses a common planning rule: Base CFM = Total BTU ÷ 100. It then applies multipliers for hood placement, cooking intensity, filter resistance, duct length, elbows, duct size, and cooktop width.

Final estimate: Recommended CFM = clamp(Base CFM × Π multipliers, 150, 1500).

How to use this calculator

  1. Enter total cooktop output in BTU/h (or select kW for electric ratings).
  2. Choose hood type and cooking style to match your real habits.
  3. Add duct length, elbows, and duct diameter to account for pressure losses.
  4. Press Calculate CFM to see your recommended airflow.
  5. Use Download CSV or Download PDF for planning notes.

Example data table

Scenario Total BTU/h Hood type Duct (ft) Elbows 90 Duct (in) Cooking style Estimated CFM
Standard 30" daily cooking 45,000 Wall canopy 10 1 6 Medium ~520
Island cooktop, more smoke 60,000 Island canopy 15 2 7 Heavy ~1,020
Compact apartment setup 30,000 Wall canopy 6 0 6 Light ~250
Examples are planning estimates; real performance depends on hood design and installation.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.