EightPtGridSystem [fact] v1.0.0

The 8-point grid is the dominant spacing system in modern UI design, originating from iOS HIG and Material Design's density unit. Components, padding, margins, and type vertical-rhythm all align to multiples of 8 (with 4 as a half-step).

Aligning all spacing values to multiples of 8 px (with 4 px as the half-step) yields cross-device pixel-grid alignment for the major device pixel densities (1×, 1.5×, 2×, 3×) and reduces design-decision fatigue by replacing arbitrary numbers with a constrained ladder.

Confidence

strong

Applies To

• spacing tokens (margin, padding, gap)
• component dimensions (button height, input height)
• type vertical rhythm (line-height multiples)
• icon sizing (16, 24, 32, 40, 48)

Quantitative

• Base Unit: 8 px
• Half Step: 4 px
• Canonical Progression: 4, 8, 12, 16, 24, 32, 40, 48, 64, 80, 96
• Pixel Density Coverage: 1×, 1.5×, 2×, 3× all land on integer pixels at 8px multiples

Counter Conditions

• Editorial / typography-driven layouts may use a baseline grid derived from line-height instead.
• Dense-data UIs (spreadsheets, terminals) often drop to a 4-px grid for tighter packing.
• Wearable / TV / car interfaces use larger base units (16, 24).

EightPtGridSystem [fact] v1.0.0

The 8-point grid is the dominant spacing system in modern UI design, originating from iOS HIG and Material Design's density unit. Components, padding, margins, and type vertical-rhythm all align to multiples of 8 (with 4 as a half-step).

Aligning all spacing values to multiples of 8 px (with 4 px as the half-step) yields cross-device pixel-grid alignment for the major device pixel densities (1×, 1.5×, 2×, 3×) and reduces design-decision fatigue by replacing arbitrary numbers with a constrained ladder.

Confidence

strong

Applies To

• spacing tokens (margin, padding, gap)
• component dimensions (button height, input height)
• type vertical rhythm (line-height multiples)
• icon sizing (16, 24, 32, 40, 48)

Quantitative

• Base Unit: 8 px
• Half Step: 4 px
• Canonical Progression: 4, 8, 12, 16, 24, 32, 40, 48, 64, 80, 96
• Pixel Density Coverage: 1×, 1.5×, 2×, 3× all land on integer pixels at 8px multiples

Counter Conditions

• Editorial / typography-driven layouts may use a baseline grid derived from line-height instead.
• Dense-data UIs (spreadsheets, terminals) often drop to a 4-px grid for tighter packing.
• Wearable / TV / car interfaces use larger base units (16, 24).

Sources

Confidence

strong

Source

• Apple Human Interface Guidelines — layout grid (8pt baseline)
• Google Material Design — keylines (8dp grid, 4dp half-step)
• Bryn Jackson, 'The 8-Point Grid' (2015)

Applies To

• spacing tokens (margin, padding, gap)
• component dimensions (button height, input height)
• type vertical rhythm (line-height multiples)
• icon sizing (16, 24, 32, 40, 48)

Quantitative

• Base Unit: 8 px
• Half Step: 4 px
• Canonical Progression: 4, 8, 12, 16, 24, 32, 40, 48, 64, 80, 96
• Pixel Density Coverage: 1×, 1.5×, 2×, 3× all land on integer pixels at 8px multiples

Counter Conditions

• Editorial / typography-driven layouts may use a baseline grid derived from line-height instead.
• Dense-data UIs (spreadsheets, terminals) often drop to a 4-px grid for tighter packing.
• Wearable / TV / car interfaces use larger base units (16, 24).