About this tool
Height of instrument, reduced levels, the arithmetic check and misclosure from backsight, intermediate and foresight readings.
HI = RL + BS; RL = HI − IS/FS; check ΣBS − ΣFS = final RL − start RL.
Formula: HI = RL + BS RL = HI − IS/FS
Example: Starting reduced level (m) = 50 → Final reduced level (m) = 49, Arithmetic check ΣBS − ΣFS (m) = -1.
Misclosure is only shown when you supply the closing reduced level; nothing is adjusted or distributed.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Level Book Calculator work?
HI = RL + BS; RL = HI − IS/FS; check ΣBS − ΣFS = final RL − start RL.
What should I keep in mind?
Misclosure is only shown when you supply the closing reduced level; nothing is adjusted or distributed.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.