How long will a 1lb propane tank last on a weed torch?

A 1lb propane tank lasts roughly 1 to 2 hours on a weed torch, depending on how far you open the valve. At full output, expect closer to 45–60 minutes; at a half-open valve — which is sufficient for most driveway cracks and sidewalk joints — you can stretch that to 90 minutes or more.

A standard 1lb cylinder holds about 0.4 lbs of usable propane by weight. Weed torches consume fuel faster at maximum BTU output, but most residential weed control doesn't require a fully open valve. Working driveway expansion joints or gravel bed borders at moderate flame uses less fuel per minute than holding the valve wide open on dense vegetation. Burn time also shortens in cold weather, since propane pressure drops below 40°F.

• Typical 1lb propane tank burn time on a weed torch: 45–60 minutes at full valve, up to 90+ minutes at half valve.
• Usable propane in a standard 1lb cylinder: approximately 0.38–0.42 lbs of liquid propane.
• ETOOLAB weed torch max output: up to 1,200,000 BTU/hr, reached only at full valve setting.
• Cold weather effect: propane pressure drops noticeably below 40°F, reducing flame output and effective burn time.
• A 20lb refillable tank extends weed torch runtime to roughly 9–18 hours under the same usage conditions.