Check Range Margin Over the Longest Service-Free Gap — Free
A route is only as safe as its longest stretch without fuel, water or charging. Compare each section’s worst gap with your real range and see which margin is thinnest.
The proof surface
Leg splitters divide a drive by driving time. This checks physical reachability: the longest service-free gap on each section against the range you actually have, with the tightest margin as the headline.
Why the flat version breaks
Using tank size as range
Range depends on consumption, load, terrain and climate use.
Averaging service spacing
One long gap decides reachability, not the mean.
Calling margin a promise
A positive margin assumes the vehicle reaches the gap with a full store.
How to work the range dipstick
Enter the distance you can really travel on a full tank or charge at this trip’s load, speed and climate use. The sample 520 km is illustrative, not a manufacturer claim.
Look up the longest stretch without the service you need — not the average spacing. A section of 800 km with a 310 km gap leaves 210 km of margin at the sample range.
The summary reports the smallest margin across sections, because that is the stretch that decides the plan. Sixty kilometres of margin on the mountain pass is the binding number in the alternate sample.
A margin of zero or less means the gap equals or beats the range: add a stop, carry fuel or charge within the rules that apply to you, or reroute. Do not treat a slim margin as a guarantee — weather, traffic and detours all consume it.
What the range dipstick replaces
| Question | Before | Visible working |
|---|---|---|
| Using tank size as range | Range depends on consumption, load, terrain and climate use. | Find the worst gap per section |
| Averaging service spacing | One long gap decides reachability, not the mean. | Read the tightest margin first |
| Calling margin a promise | A positive margin assumes the vehicle reaches the gap with a full store. | Turn a zero into a plan change |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Route planning arithmetic with a range you supply. Not vehicle advice, a range guarantee or off-road safety assessment; carry reserves appropriate to the terrain and check current service availability.
Data note: Everything runs in this browser tab on the range dipstick: your route section | section length km | longest service-free gap km stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a meter band gauge
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the range dipstick reading, and holds your drafts on this device — one free run, then $ 4 one-time for the layer that keeps filing.
The range dipstick reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the check range margin over the longest service-free gap companionBoundary
Route planning arithmetic with a range you supply. Not vehicle advice, a range guarantee or off-road safety assessment; carry reserves appropriate to the terrain and check current service availability.
What this is built on
- Method: The summary reports the smallest margin across sections, because that is the stretch that decides the plan. Sixty kilometres of margin on the mountain pass is the binding number in the alternate sample.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-28, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Before: Range depends on consumption, load, terrain and climate use. After: the range dipstick shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this range dipstick, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a range dipstick. Return plain rows only: route section | section length km | longest service-free gap km. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: route section | section length km | longest service-free gap km. No AI response is executed as code.