Calculators
Free power station runtime calculator for portable battery systems
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A free calculator that determines how long a portable power station will run your devices by analyzing manufacturer specifications and your power consumption.
Kilohour is a free runtime calculator for portable power stations. Users select a power station model from 52 tracked units across 6 brands, choose the devices they want to power, and receive detailed runtime estimates showing how long the station will run them. The calculator displays cautious, typical and optimistic runtime ranges with transparent assumptions.
All calculations are built from manufacturer specifications, with every number linked to its source. The site shows the formula behind each result and labels every assumption, such as inverter efficiency and usable battery capacity. The calculator covers popular brands including EcoFlow, Jackery, BLUETTI, Anker SOLIX, Goal Zero and DJI.
Beyond runtime calculation, Kilohour offers complementary tools including a capacity calculator for determining required power station size, a solar recharge duration estimator, station comparison features, and scenario planners for specific situations like CPAP overnight operation and home outages. Free widgets are available to embed these calculators on external websites.
The site is built and maintained by Inam Ur Rehman, who keeps all product data current and publishes the methodology behind every calculation. Every estimate comes with labeled assumptions and sourced specs rather than guesswork.
Pricing model: Free
If a device's power draw or startup surge exceeds the power station's continuous or surge ratings, the calculator flags it. For example, a microwave pulling 1,500 W cannot run on the EcoFlow RIVER 3 Plus because its inverter is only rated 600 W continuous, so it shuts off.
The calculator includes inverter efficiency (88% default) and idle draw (10 W default) in the real power draw calculation. These reduce the available energy from the battery and are listed as labeled assumptions.
Specs are checked and updated regularly, with a requirement that every model is rechecked within 180 days. Automated scripts reopen each model's source page and confirm capacity, continuous output, surge and solar figures still appear there.
No. The site explicitly states that every result is an estimate from published specs, not a safety, medical or runtime guarantee. Results should be checked against manufacturer sources if they matter to a decision.
Users can email hello@kilohour.com with the product, value, and a link to the manufacturer's page showing the correct specification. Every product page also has a 'Report it' link that fills in the subject.
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