Significant Figures Calculator – Round to Sig Figs Instantly
Free Significant Figures Calculator — round any number to the correct number of sig figs instantly. Includes rules, examples and a step-by-step guide.
Math Calculators
Fractions, quadratic, percentage calculators
Molarity Calculator – Calculate Moles, Volume and Concentration
Free Molarity Calculator — enter moles and volume to calculate concentration in mol/L instantly. Includes formula, examples and a reference table.
Ethanol Dilution Calculator – Mix Ethanol to Any Concentration
Free online Ethanol Dilution Calculator. Enter stock concentration, desired concentration, and final volume to instantly calculate how much ethanol and water to mix.
Final Grade Calculator — What Score Do I Need to Pass? (2026)
Free Final Grade Calculator. Enter your current grade and desired final grade to find exactly what score you need on your final exam to pass or hit your target.
Dew Point Calculator – Temperature, Humidity & Comfort (2026)
Calculate dew point temperature from air temperature and relative humidity with our free Dew Point Calculator. Includes comfort chart and HVAC/weather
PPI Calculator – Pixels Per Inch & Screen Pixel Density (2026)
Calculate pixels per inch (PPI) and pixel density for any screen with our free PPI Calculator. Enter screen resolution and size to instantly find your
Roof Pitch Calculator – Rise, Run & Angle (Free 2026 Tool)
Use our free Roof Pitch Calculator to find rise, run, angle, and rafter length instantly. Includes pitch chart, formulas, and a full DIY guide for 202
GPA Calculator – How to Calculate GPA (Weighted & Unweighted) 2026
Learn how to calculate GPA step by step with our complete grade point conversion table. Covers weighted vs unweighted GPA, cumulative GPA, and percentage to GPA conversion.
Percentage Calculator: How to Calculate Percentage Fast and Easy
Learn how to calculate percentage with our free Percentage Calculator. Step-by-step formulas, examples, and tips to calculate percent increase, decrease, and more.
How to Calculate the Square Footage of a Room
Quick Answer: Learn how to calculate square footage of any room shape. Step-by-step guide with formulas for rectangular, L-shaped, and circular rooms plus a free calculator. How to Calculate the Square Footage of a Room – Step-by-Step Guide If you are renovating your house or thinking of doing it, buying flooring, painting walls or want … Read more