About These Calculators
Be prepared for any scenario. Calculate water storage needs, estimate emergency food requirements, size backup generators, and plan bug-out bag contents.
Survival & Preparedness Calculators
5 toolsBug Out Bag Weight Calculator
Build the perfect bug-out bag with an itemized checklist and weight targets
Water Storage Calculator
Calculate how much emergency water your household needs to store
Emergency Food Supply Calculator
Plan your emergency food storage by calories, cost, and shelf space
Generator Run Time Calculator
Calculate how long your generator will run on a tank of fuel
Calorie Storage Calculator
Plan long-term calorie storage with a balanced food supply and cost estimates
Frequently Asked Questions
Are these survival & preparedness calculators free?
Yes, all 5 calculators are completely free with no signup required. They run entirely in your browser — no data is sent to any server.
How accurate are these calculators?
Our calculators use industry-standard formulas and are regularly updated. However, they provide estimates — always verify critical calculations with a professional in the relevant field.
Can I use these calculators on my phone?
Yes, all calculators are mobile-responsive and work on any device with a web browser. No app download needed.
Do you save my calculations?
No. All calculations happen in your browser. We don't store any of your inputs or results. Your data stays on your device.
Can I embed these calculators on my website?
Select calculators offer embed codes that you can copy and paste into your website or blog. Look for the "Embed This Calculator" section on individual tool pages.