Figure

Measurements and units

Areas and volumes

Calculate rectangle and triangle area and rectangular-box volume, including metric output.

Area measures a surface and uses square units; volume measures three-dimensional space and uses cubic units. Choose the relationship for the shape, label its dimensions, then select the output format you need.

Rectangle area

Multiply length by width. Label both lengths.1

Start a new calculation

Use 2nd if a unit is above its button.

  1. Start fresh

    Press Clear entry, then Clear entry.

  2. Press the keys

    Press Select length units.

Calculate

  1. Length

    Press 12, then feet, then 6, then inches, then Multiply.

  2. Width

    Press 15, then feet, then 8, then inches, then Equals.
  1. Example · Area195.8333 square feet

Triangle area

Use the base and its perpendicular height.1

Start a new calculation

Use 2nd if a unit is above its button.

  1. Start fresh

    Press Clear entry, then Clear entry.

  2. Press the keys

    Press Select length units.

Calculate

  1. Base

    Press 45, then inches.

  2. Halve the base

    Press Divide, then 2, then Equals.

  3. Multiply

    Press Multiply.

  4. Perpendicular height

    Press 30, then inches, then Equals.
  1. Example · Area675 square inches

Box volume

Multiply length, width and height. Label all three lengths.2

Start a new calculation

Use 2nd if a unit is above its button.

  1. Start fresh

    Press Clear entry, then Clear entry.

  2. Press the keys

    Press Select length units.

Calculate

  1. Length

    Press 15, then inches, then Multiply.

  2. Width

    Press 6, then inches, then Multiply.

  3. Height

    Press 9, then inches, then 1, then Fraction, then 2, then Equals.
  1. Example · Volume855 cubic inches

Convert a box volume to cubic meters

Find the box volume, then convert to cubic meters.2

Start a new calculation

Use 2nd if a unit is above its button.

  1. Start fresh

    Press Clear entry, then Clear entry.

  2. Press the keys

    Press Select length units.

Calculate

  1. Length

    Press 3, then feet, then Multiply.

  2. Width

    Press 1, then feet, then 9, then inches, then 5, then Fraction, then 8, then Multiply.

  3. Height

    Press 2, then feet, then 4, then inches, then Equals.

  4. Convert to cubic meters

    Press Select volume units, then Cubic meters.
  1. Example · Volume in cubic meters0.3572052 cubic meters

Display assumptions

  1. Area units: Automatic. ↩1↩2

  2. Volume units: Automatic. ↩1↩2

Keep the guide beside your calculation.

These examples are built into Figure. Open Help while you calculate, then return to the same guide and reading position.

See Help in Figure →