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# Time/watt calculator

Make it easy to see how long to cook a meal in any microwave
 (+2, -1) [vote for, against]

At the moment I do not have access to one of the many watt to time conversion charts on the internet.

I have an 800 W microwave. The frozen dinner I am preparing says to cook it at 1100 Watts for 6 1/2 minutes.

I punch the 1100 watts for 6 1/2 minutes buttons on the built-in microwave calculator to calculate the additional time it will take to heat the food in a lesser 800 W microwave.

The microwave automatically sets the microwave for the new time as acquired through the calculator.

Edit 2020 3 21: I should have mentioned "Because there are so many variables when it comes to micro-cooking frozen foods, there is not a specific formula or direct ratio for calculating conversion times."[1]

No Algebra required at school [2]

People are bad at math [3]

 — Sunstone, Mar 15 2020

Microwave timer app https://apps.apple....-timer/id1450924111
Not baked into the microwave, but usable. [Chairborne Hero, Mar 15 2020]

Another one https://apps.apple....tts-up/id1039678400
[Chairborne Hero, Mar 15 2020]

[1] Maybe the proper conversion can only be done by the manufacturer of the microwave? https://www.theeagl...4-e31a9377dfe0.html
[Sunstone, Mar 21 2020]

[2] No algebra required at school to teach you to learn how to think https://duckduckgo....uired&t=ffsb&ia=web
[Sunstone, Mar 21 2020]

[3] Many if not most are bad at math https://duckduckgo....+math&t=ffsb&ia=web
[Sunstone, Mar 21 2020]

 6.5 minutes = 390 seconds.

 1100/800 = 11/8 = 1.375

 390 * 1.375 = 536.5 = 8.93 minutes

No online calculator needed...
 — 8th of 7, Mar 15 2020

Perhaps the microwave oven control panel should be calibrated in whatt-ours instead of seconds? Would that be in joules I suppose?
 — pocmloc, Mar 15 2020

It would be better to calculate a set of conversion factors - in binary, for universal applicability - for each power range; these could then be chiselled onto a small polished granite stele, placed alongside the microwave oven for easy reference.
 — 8th of 7, Mar 15 2020

 // I do not have access to one of the many watt to time conversion charts on the internet.//

 How do you access HB? Minitel?

 — Chairborne Hero, Mar 15 2020

We guess RFC 1149, "IP over Avian Carriers"
 — 8th of 7, Mar 15 2020

 I vacillated on this but decided to bone.

Between online calculators and apps, people who can do math, microwave ovens with inverters and variable power levels and auto-sensing ... building in a calculator seems unnecessary.
 — Chairborne Hero, Mar 15 2020

But that does exactly fulfill the criteria for half-bakedness ...
 — 8th of 7, Mar 21 2020

 That's it, is it? ... It's not particularly silly, is it? I mean, a calculator isn't silly at all and putting it on a oven merely adds an alternate way to time your ping meal.

Just not half-baked ENOUGH you see...
 — Chairborne Hero, Mar 22 2020

It would have to be a Babbage engine, powered by a Newcomen engine driven by steam from the microwave oven, then. ..
 — 8th of 7, Mar 22 2020

I think you should need to increase the time beyond what the formula says when scaling for a less-powerful microwave oven, and vice versa, because heat loss from the food will take away a larger portion of the input energy at a lower power, due to the heating taking place over a longer time interval. By how much will depend on the food and its shape.
 — notexactly, Mar 22 2020

 // a Babbage engine, powered by a Newcomen engine driven by steam //

You could post that on Halfbakery’s sister site, Steampunkery.org ...
 — Chairborne Hero, Mar 22 2020

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