A calculator for the one question every griller has asked mid-cookout: is there enough gas to finish?
Propane Grill Time started with a familiar backyard moment — burgers on the grates, friends waiting, and a nagging worry that the tank might quit before the food is done. Searching "how long does a propane tank last" turns up a pile of articles that all say "it depends," bury a rule of thumb three paragraphs down, and never actually do the math for your tank and your grill. We thought that gap deserved a real tool instead of another article.
So we built the simplest thing that answers the question directly. You tell it three things — how big your tank is, how much fuel is left, and your grill's total BTU output — and it instantly shows the hours and minutes of grilling you can expect, how many more cookouts that is, and the pounds and gallons of propane remaining. There is no "calculate" button to hunt for and no wall of pop-ups: the answer updates the moment you move a slider, and the actual formula and numbers are printed right under the result so you can see exactly how it got there.
The math is honest. Propane releases about 21,594 BTU per pound, so the calculator multiplies the propane you have left by that figure and divides by how fast your grill burns it. We also added a "weigh the tank" mode because weighing — subtracting the stamped tare weight from what the tank reads on a scale — is the only way to know precisely how much gas is left when you do not have a gauge. Every number is computed in your browser; nothing is sent anywhere, and there is nothing to install or sign up for.
It is built mobile-first on purpose, because the moment you need it most is standing over a hot grill with a phone in one hand. Big readable result, tap targets you can hit with greasy thumbs, and a layout that works in bright sunlight. We keep it free and pay for it with unobtrusive ads and the occasional affiliate link to genuinely useful gear like tank scales and gauges.
Have an idea, a correction, or a grill whose BTU rating we should add to the presets? We would love to hear it — reach us any time on the contact page. Now go check your tank before the coals — er, the burners — get cold.