Sample computation: pt to px
A reproducible example uses 12 pt. Applying the rule gives 16 px, or 12 × 1.333333333333 = 16.
The nearby values show how CSS pixels at 96 ppi changes proportionally with typographic points.
A value labeled in typographic points can be recalculated for a document expecting CSS pixels at 96 ppi. The page preserves the unit context while displaying the answer and its return check.
A reproducible example uses 12 pt. Applying the rule gives 16 px, or 12 × 1.333333333333 = 16.
The nearby values show how CSS pixels at 96 ppi changes proportionally with typographic points.
The move from typographic points to CSS pixels at 96 ppi is common in web typography, design handoffs, layout specifications, and interface mockups.
Both pt and px describe typography, so points to pixels changes the notation instead of the underlying quantity.
Carry the unrounded CSS pixels at 96 ppi quantity through intermediate arithmetic. Round once when the points to pixels output is presented.
A coarse measurement in typographic points remains coarse after it is written in px, even though conversion creates a decimal.
Read every input marked pt as typographic points. Read the answer marked px as CSS pixels at 96 ppi. The numerical points to pixels relationship uses 1.333333333333.
Resolution units describe pixel density, while standalone pixel and point units describe lengths under a stated rendering convention. Verification the complete unit name before applying this points to pixels relationship to an outside data input. That notation keeps a future reader from applying the points to pixels multiplier in the opposite direction.
For another destination unit after points to pixels, continue with the general typography converter. A connected conversion is pixels to points.
The practical question in web typography, design handoffs, layout specifications, and interface mockups is usually not the multiplier alone; it is whether the CSS pixels at 96 ppi output still represents the intended typographic points quantity.
Read the unit, magnitude, and resolution together. Those three checks keep a valid points to pixels computation from being attached to the incorrect item or operating condition.
Write the input quantity with pt before doing any arithmetic. For points to pixels, Multiply typographic points by 1.333333333333 to obtain CSS pixels at 96 ppi.
Keep the px label beside the answer and then work backward. Divide CSS pixels at 96 ppi by 1.333333333333 to return to typographic points.
The scale begins with one pt and ends at 1.333333333 px. Looking back from px, the reciprocal magnitude is 0.75 pt.
A paper computation can cross out pt only when that conversion fraction places the symbol as the ratio denominator. This exposes a flipped multiplier.
Copy CSS pixels at 96 ppi with its px label forward to the following stage. Keeping the corresponding typographic points quantity makes the points to pixels output traceable if a later total looks wrong.
Estimate CSS pixels at 96 ppi from the size of 1.333333333333 before reading the calculated output. A large disagreement suggests a transposed unit.
Next convert the px output back to pt; it should agree with 12.
Multiply typographic points by 1.333333333333 to obtain CSS pixels at 96 ppi. Divide CSS pixels at 96 ppi by 1.333333333333 to return to typographic points.
Use the inverse relationship on the calculated px quantity. If it does not return the entered pt amount, recheck the multiplier and unit order.
Yes. Zero pt maps to zero px because points to pixels has no zero-point offset.
A comparison may need fewer px decimals than a later formula. Choose the concluding rounding based on purpose and the quality of typographic points.
The formula can process a negative pt amount. Some real-world typography quantities, however, are constrained to nonnegative values.
Inspect the full typographic points definition, the CSS pixels at 96 ppi target, and the points to pixels multiplier. Small differences often arise from rounding; bigger gaps commonly signal another standard.