How long will your gas bottle last?
Get an instant, honest forecast for your 9kg, 14kg, 19kg or 48kg LPG cylinder. No app, no signup, no hardware — just answer 3 quick questions.
- ✓ No signup
- ✓ Works offline
- ✓ Refill reminders
- ✓ Privacy-first
Configure your cylinder
Leave at 100% if you just installed a fresh cylinder.
We'll subtract usage since this date from your predictions.
Your gas forecast
Status
100%
Estimated days left
49 days
Predicted empty
18 Aug 2026
Burn rate
0.18 kg / day
Gas Stove · Medium — 1 hr/day
How the GasCheck calculator works
GasCheck uses the same maths gas engineers use. We take the appliance's megajoule rating (MJ/h), multiply by how long you use it each day, then divide by 49 MJ per kg of LPG. That gives a realistic daily kg burn rate — and an honest estimate of how many days are left in your bottle.
Quick reference
Why no hardware?
Smart gas monitors in South Africa cost over R1,000. GasCheck gives you the same "days remaining" insight for free by modelling consumption mathematically. Use the fill slider whenever you swap or weigh your bottle to keep predictions sharp.
Frequently asked questions
Is GasCheck really free?▾
Yes — no signup, no ads-by-default, no hidden fees. We may show simple distributor listings when you're running low.
Will it work without internet?▾
After your first visit the calculator runs entirely in your browser. Your settings are stored locally on your device.
How accurate is the estimate?▾
GasCheck uses standard MJ/h ratings and LPG energy density. Real burn rate varies with flame setting, weather and appliance condition — treat it as a strong guide, not gospel.