Know the day your propane hits 20%, before the cold snap does.

Free calculator from your tank size, gauge reading and ZIP. For $3 a month, PropaneDays re-forecasts every day from your local weather and emails you in time to order.

Check my tank free No card for 7 days

Run out on will-call and an emergency delivery typically costs $75–$200 extra, plus a leak test before the gas comes back on.

PropaneDays · HouseRe-forecast 5:00 AM
Caribou, Maine · 500 gallons Estimate
19days until 20%
Reaches 20%
Tue, Nov 24
Call your supplier by
Sat, Nov 21
Empty around
Thu, Dec 10
Left today
225 gal (45%)
Gallons a day, next 16 daysavg 6.4

3 days below 15°F between Nov 8 and Nov 10; the coldest burns about 9.4 gallons.

A sample forecast: a 500-gallon tank at 45% in Caribou, Maine, with heating, cooking and hot water.

Three numbers in. A reorder date out.

No sensor on the tank. You read the gauge under the lid; PropaneDays does the weather and the arithmetic.

  1. Tell it your tank

    Enter your ZIP, tank size, today's gauge % and what runs on propane. Days left and a reorder date show up in seconds.

    500 gal · 45% · heating, cooking, hot water
  2. It re-forecasts every morning

    From your local weather and your own past readings. After two gauge readings it knows your house's burn per degree day.

    Degree days = 65°F minus the day's average
  3. An email in time to call

    When it's time to call your supplier, with your delivery lead time already counted in. Log the fill in two taps.

    Your lead time + 2 days to spare

One plan

$3 a month
  • A new forecast every morning from your local weather
  • Learns your house's burn from your gauge readings
  • An email before your reorder level, lead time counted
  • Cold-snap warnings and a weekly gauge reminder
  • Up to 10 tanks: house, cabin, RV
Start my 7 free days

7 days free with no card. Then $3 a month, cancel any time. The calculator stays free.

Before you start

Do I need a sensor?

No. You read the gauge on your tank (the % dial under the lid) and type it in. A weekly email reminds you to log a reading.

How accurate is it?

The first forecast uses a typical rate and is marked as an estimate. After two readings it uses your house's own rate and gets better with each one. Always check your gauge before you order.

Does it work for RVs and cabins?

Yes. Enter the tank size and the ZIP where the tank is. You can pause alerts when a cabin is closed up.

Will it order propane for me?

No. It tells you when to call your supplier, with your supplier's delivery lead time already counted in.

All questions, and how the forecast works

The email comes with the reason

Every morning at 5 it reads your forecast again. When your reorder date comes within your lead time plus 2 days, you get one email, then a reminder every 3 days until you log the fill.

If a cold snap pulls the date 3 or more days earlier, it tells you that too, and says which days did it.

Cold snaps burn propane fast. Know your date first.

Check my tank free