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Free, accurate calculators for home energy savings — solar payback, heat pumps, EV charging, appliance running costs and more. No signup.

Which is more popular?
Based on our record, Code.org seems to be more popular. It has been mentioned 385 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | howmuchwatts.com | code.org |
| Pricing | — | |
| Company | — | 2012 |
| Listed in |
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Programming For Kids: Scratch vs Code.org
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As answered by people managing HowMuchWatts and Code.org.
HowMuchWatts's answer
HowMuchWatts is a free suite of 50+ home energy calculators - no signup, no ads gating the result. Every calculator shows its formula and updates live as you type, so you can see exactly how the number was reached rather than trusting a black box. It also includes an appliance power-consumption reference chart and plain-English guides (solar payback, heat pump vs gas, EV charging costs) that pair with the calculators instead of just linking out.
HowMuchWatts's answer
Most energy calculators are either buried in signup walls, ad-heavy, or give a single number with no way to check the math. HowMuchWatts is: - Free, no account needed - Transparent - the formula is shown alongside every result - Focused - 50+ calculators covering solar, heat pumps, EVs, and appliances specifically, not a generic all-purpose calculator site - Embeddable - any blog can drop a calculator into a post for free
HowMuchWatts's answer
Homeowners and renters trying to make a specific energy decision - is solar worth it, should I switch to a heat pump, what will an EV cost to charge, what is this appliance actually costing me. Secondary audience: bloggers and content sites in the home/energy space who embed the calculators in their own articles.
HowMuchWatts's answer
Built out of frustration with existing energy calculators - they were either oversimplified, buried behind email walls, or impossible to verify. HowMuchWatts started as a handful of calculators that show their formula and grew into a 50+ calculator suite covering solar, heat pumps, EVs, and everyday appliances, plus guides and a reference chart for the underlying data.
Share your experience with using HowMuchWatts and Code.org. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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Code.org is an online marketplace that can empower students, specifically students, to get detailed knowledge regarding the principles of the computer sciences. This platform can let its users access the free coding...
Nevertheless, the platform has the stats to prove its dependability. More than 67 million people use Code.org, including over two million teachers. In addition, the platform records over 208 million projects so far.
Code.org is much easier to use than Thunkable.First of all names say everything.Second,it has more modes than just "drag-and-drop".
Recommendations tracked on public social media and blogs since March 2021.


Tracking HowMuchWatts since Jul 2026.
Code.org uses an extremely outdated version of javascript, It's so hard to access data in array, im basically forced to do this. Cant wait to ditch this shit. Source: almost 3 years ago
I'm not sure if your 4.5yo is old enough to try Scratch[1] but nothing is too young these days. My elder got into Scratch around that time. These days, my younger one is into https://code.org and she make things go around, do stuffs,... - Source: Hacker News / almost 3 years ago
So I am using code.org to make a platforming game, and if I am halfway off of a platform I slide off of it. Idk if this is a quirk with code.org or if I did something wrong. You can check the hitboxes by pressing debug sprites in the... Source: almost 3 years ago
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