Welcome To Metrioc Force Measurement & Calibration

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Metrioc delivers ISO/IEC 17025 accredited force calibration, precision equipment, and custom metrology solutions—backed by technical expertise, responsive service, and uncompromising accuracy.

3325 Connelly Road

Emigsville, PA 17318 USA

: 1 (717) 683-1717
LOCAL GRAVITY CALCULATOR

Convert force to mass with local gravity.

Use geographic coordinates and elevation to estimate local gravity, then convert a measured force into mass.

01

Set the location

Click the map or enter coordinates.

Click a point to fill coordinates and request elevation.

USGS The National Map

Example location: Emigsville, Pennsylvania. Map elevation is an estimate; a manually entered surveyed altitude takes priority.

02

Enter the force

Select the mass unit for the result.

Important — verify before use.

Coordinates, map tiles, elevation, and computed gravity are estimates. Confirm the site coordinates, surveyed elevation, local gravity, units, instrument configuration, calibration or adjustment requirements, and applicable rules before relying on a result. This calculator is for educational and preliminary engineering use only; it is not a calibration, survey, legal-for-trade determination, or substitute for manufacturer instructions, qualified professional judgment, or regulatory approval. Metrioc makes no warranty and disclaims liability to the fullest extent permitted by law.

MEASUREMENT CONFIDENCE, LOCATION BY LOCATION

Account for the gravity where the measurement happens.

One focused calculator. Common force and mass units. A location-aware result with the method shown.

g

THE LOCAL VALUE
THREE-PART REFERENCE

Understand the measurement before you convert it.

Force is the measured quantity, gravity is the location-dependent link, and mass is the calculated result.

01 · THE FOUNDATION

Force is the starting quantity.

Load cells, crane scales, and force gauges respond to force. The calculator first converts the selected force unit into newtons.

Examples:
1 lbf = 4.4482216152605 N
1 kgf = 9.80665 N
1 kip = 1000 lbf

02 · LOCAL GRAVITY

Latitude and elevation change g.

Gravity changes with latitude because of Earth’s rotation and ellipsoidal shape, and it decreases as elevation increases. The calculator applies both effects before converting force into mass.

The exact calculation method and its limitations are disclosed in the fine print at the end of this page.

03 · MASS RESULT

Mass follows from m = F ÷ g.

The final value is a calculated mass, not a direct mass measurement. The result is converted from kilograms into the selected display unit.

For regulated or critical use, verify the instrument’s calibration, gravity compensation, site data, and applicable requirements.

THE IMPORTANT DIFFERENCE

Same force. Different location. Different mass equivalent.

Mass at the point of use
m = F / glocal

BASED ON

NOAA NGS Surface Gravity Prediction   ·   NIST Handbook 44   ·   OIML R 76-1:2006   ·   USGS Elevation Point Query Service

Calculation Method and Limitations. Local gravity is estimated using the GRS 80 normal-gravity equation at the entered latitude, followed by a first-order free-air correction for altitude. This calculator does not directly access, reproduce, or return results from NOAA’s NGS Surface Gravity Prediction tool. NOAA’s prediction tool interpolates observed gravity data and may produce a different result.

Longitude is used to select the map location and request elevation; it is not used directly in the analytical gravity equation. The estimate does not account for local gravity anomalies, terrain, geology, tides, or other site-specific effects. Map coordinates, USGS elevation data, and calculated results should be independently verified.

This calculator is provided for educational and preliminary engineering purposes only. It is not a gravity survey, calibration, legal-for-trade determination, or substitute for verified site data, manufacturer requirements, applicable regulations, or qualified professional judgment. References to NOAA and USGS identify public methodologies and data services and do not imply agency endorsement.