RAM Latency Calculator

RAM Latency Calculator is a free online tool. Work out true memory latency from speed and CAS. Pick your parts or enter your numbers and the estimate updates instantly. Nothing needs to be submitted.

Open RAM Latency Calculator. Set the options you want (speed (mt/s), cas latency (cl)). Click Calculate latency. Copy the result with one click.

Yes. It is completely free, with no usage limits, watermarks or paid tiers.

No. Open the page and start using it. There is no account, download or browser extension.

Yes. The calculation runs in your browser, so your settings and part choices are never uploaded or stored.

RAM Latency Calculator has one mode: Calculate latency. You can also set: speed (mt/s), cas latency (cl).

Yes. The layout adapts to any screen size, and the tool works in mobile browsers on iOS and Android.

Current versions of Chrome, Edge, Firefox and Safari. JavaScript must be enabled.

Yes. The result is yours to use in personal and commercial projects without attribution.

There is no fixed limit. Very large inputs depend on your device's memory and may feel slower on older phones.

Click the Copy button above the Result box. For tools that transform text, Use as input moves the result back to the input so you can apply another change.

After the page has loaded, yes. Processing happens in your browser, so the tool keeps working even if your connection drops.

Make sure every number field holds a valid number and that you picked parts from the lists. The message under the result points to the field to fix.

Estimates use approximate relative performance indexes and published power ratings, so treat them as a planning guide. Real results depend on the game, settings, drivers, memory and cooling.

Calculators work on one setup at a time. Change any setting to compare another build instantly.

Choosing a power supply before building a PC; Checking if a CPU or GPU upgrade is worth it; Matching mouse sensitivity across games; Estimating running costs, download times and odds.

You may also like CPU & GPU Bottleneck Calculator, PSU Wattage Calculator, GPU Comparison Tool, CPU Comparison Tool. All of them are free and work in the same way.

They combine simple formulas with approximate relative performance and power data for popular parts. The goal is a realistic planning guide rather than a lab benchmark.

No. For a purchase decision, compare your estimate with independent benchmark reviews of the exact games and settings you care about.

It is designed for desktop parts. Laptop CPUs and GPUs run at lower power limits, so their real performance and power use are lower than the desktop figures.

Some imbalance is normal, because one part is always the limit. A GPU-limited system is ideal for gaming, while a heavy CPU limit means the graphics card is underused.

True latency in nanoseconds equals CAS latency times 2000 divided by the data rate in MT/s. It allows a fair comparison between kits with different speeds and timings.

Use the contact link in the footer. Bug reports and tool ideas are welcome, and popular requests are added regularly.