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Mattress Size Calculator
Compares every standard mattress size in centimetres and inches, and checks the clearance left in your room.
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In short
Mattress Size Calculator is a free online tool on inputtesthub.com that compares every standard mattress size in centimetres and inches, and checks the clearance left in your room. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Mattress Size Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Mattress Size Calculator
The Mattress Size Calculator compares every standard mattress size in centimetres and inches, and checks the clearance left in your room. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Checking a bed will fit with room to walk around it.
- Comparing a UK King against a US King before buying bedding.
- Working out width per person on a shared bed.
Details
| UK King | 150 × 200 cm |
|---|---|
| US King | 193 × 203 cm |
| Queen (US) | 152 × 203 cm |
| Walking space | 60 cm each side |
The maths behind it
This tool uses Sizes are the published standards. Clearance is room dimension minus mattress dimension, against a 60 cm minimum walking space each side you need to use. Every intermediate value is shown on screen, so the result can be checked by hand.
Bed size names are not international. A UK King is 43 cm narrower than a US King, and bedding for one does not fit the other. Buy the mattress and the bedding to the same measurement in centimetres rather than to the name.
Frequently asked questions
Is a UK King the same as a US King?
No. A UK King is 150 × 200 cm and a US King is 193 × 203 cm — the American bed is 43 cm wider. Sheets and duvets bought for one will not fit the other.
How much space do I need around a bed?
About 60 cm on any side you need to walk down, and the same at the foot if you pass that way. Less than that and you turn sideways every time.
Are there any usage caps on the Mattress Size Calculator?
There is no cost and no cap. The Mattress Size Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Does anything I enter leave my computer?
No. The Mattress Size Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What formula does the Mattress Size Calculator use?
It uses Sizes are the published standards. Clearance is room dimension minus mattress dimension, against a 60 cm minimum walking space each side you need to use. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What problem does the Mattress Size Calculator solve?
Typical uses: checking a bed will fit with room to walk around it. Comparing a UK King against a US King before buying bedding. Working out width per person on a shared bed. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
Bed size names are not international. A UK King is 43 cm narrower than a US King, and bedding for one does not fit the other. Buy the mattress and the bedding to the same measurement in centimetres rather than to the name.
What are the reference figures here?
UK King is 150 × 200 cm. US King is 193 × 203 cm. Queen (US) is 152 × 203 cm. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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