CSS Fluid Clamp() Calculator
Generate a clamp() value that scales smoothly between a min and max size across a viewport range.
Every calculation runs locally in your browser. Assumes a 16px root font size — if your project changes it, the rem values here won't match.
CSS value
clamp(1rem, 0.8261rem + 0.8696vw, 1.5rem)
For informational and educational purposes only — not professional or technical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why this beats a font-size media query
A media query jumps the size instantly at one breakpoint, which can look like a visible "snap" as the window resizes. This clamp() value scales continuously between the two viewport widths — it's a straight line fitted through both (viewport, size) points and expressed as a rem-plus-vw sum, which CSS can evaluate on every resize. Below the minimum viewport and above the maximum, clamp() locks it to the flat min or max value instead of continuing to extrapolate the line.
Frequently asked questions
How does clamp() create fluid scaling without media queries?
clamp(min, preferred, max) locks a value between a floor and ceiling while letting the "preferred" value (usually a viewport-relative unit) scale smoothly in between — replacing several breakpoint-specific media query rules with one continuous formula.