Australia GST Calculator (Add or Remove 10% GST & BAS)
Add 10% GST or calculate the 1/11th GST component backwards from inclusive totals.
Stopwatch & Lap Timer
High-precision browser stopwatch with lap splits.
⟨/⟩ Embed this tool on your site
Paste this into any page — the live tool appears with a credit link back here.
✏️ Sketching your tool…
Sponsored: Recommended offer →
About Stopwatch & Lap Timer
A millisecond-precision stopwatch with start/stop/reset and a lap-split history.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Lap Stopwatch on Wikipedia. More: all calculators.
Frequently Asked Questions about Stopwatch & Lap Timer
How do I use the Stopwatch & Lap Timer?
Open the Stopwatch & Lap Timer and use the controls in the workspace below: high-precision browser stopwatch with lap splits. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Stopwatch & Lap Timer free?
Yes. The Stopwatch & Lap Timer is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Stopwatch & Lap Timer store or share my data?
No. The Stopwatch & Lap Timer runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Stopwatch & Lap Timer for?
A millisecond-precision stopwatch with start/stop/reset and a lap-split history. You will find it grouped under Calculators together with 116 other free tools on the PrimeFreeTools homepage.
Related Articles & Guides
Oct 18, 2026
Estimate Your Dog Human-Equivalent Age (Guide)
Three steps, two minutes: exact decimal age, UCSD conversion, breed-size correction. Worked example for a 6.5-year-old Beagle (medium): ln(6.5) ≈ 1.872, times 16 ≈ 30, plus 31 ≈…
Read postOct 17, 2026
Dog Years vs Human Years: What Is the Difference?
Dog years count birthdays; human years map developmental equivalence. A 4-year-old dog has lived 4 dog years and functions like a ~53-year-old human. Same animal, two numbers, two…
Read postOct 17, 2026
Which Dog Age Calculator Is Scientifically Accurate?
The scientifically accurate calculator is the one running 16 × ln(age) + 31 with breed-size correction — currently that description fits a short list headlined by our own…
Read post