Compute line slope from two points with intercept form — rise over run done right. Get m and b for graphing — free, local, no signup.
Compute distance, midpoint, and slope between coordinate points — geometry essentials. Get all three from two points — free, local, no signup.
Compute test percentages and grades from correct/total with curve options. Turn 42/50 into 84% (B) instantly — free, local, no signup.
Count working days between two dates excluding weekends — HR teams prorate leave and payroll accurately. A 20-day leave request spans 28 calendar days — free, no signup, runs locally.
Compute daily water needs from weight, activity, and climate. Drink the right amount, not 8 glasses blindly — free, local, no signup.
Diff two JSON documents with path-level change listing — spot breaking API changes instantly. Review a 500-line response diff in minutes — local processing, free, no signup.
(y₂−y₁)/(x₂−x₁) with substitution shown. Positive climbs right, negative falls, zero is flat.
Vertical lines (x₁=x₂) divide by zero — undefined, not infinite. The tool reports it correctly.
Yes — y = mx + b fully determined from two points. Graph-ready equation output.
No — math runs locally in your browser. Numbers never leave your device.
Rise 8 over run 4 gives m = 2; back-substituting, 2 = 2(1) + b so the intercept is 0. The tool draws the same line it computes.
Last updated October 2026