Free Science
Lab and homework helpers for the sciences: chemical equation balancer (exact fractional math), molarity/dilution, molecular weight with a 118-element table, projectile motion, Ohm's law, resistor color codes, voltage dividers, electrical power, density, speed/distance/time, and wind chill / heat index / dew point.
Chemical Equation Balancer
Balance any chemical equation with exact coefficients.
Open tool → LiveMolarity / Dilution Calculator
M = n/V and M1V1 = M2V2, solved any way.
Open tool → LiveMolecular Weight Calculator
Molar mass of any formula, with element breakdown.
Open tool → LiveProjectile Motion Calculator
Range, height, and flight time from launch speed and angle.
Open tool → LiveOhm’s Law Calculator
V = IR solved any way, with power included.
Open tool → LiveResistor Color-Code Reader
Read 4, 5, and 6-band resistors from their color bands.
Open tool → LiveVoltage Divider Calculator
Output voltage from two resistors — or solve for R2.
Open tool → LiveElectrical Power Calculator
P = VI = I²R = V²/R, any two knowns.
Open tool → LiveDensity / Mass / Weight Calculator
Density, mass, or volume from the other two.
Open tool → LiveSpeed / Distance / Time Calculator
Solve the triangle; converts km/h, m/s, mph.
Open tool → LiveWind Chill / Heat Index / Dew Point
Feels-like temperature plus dew point.
Open tool →Related categories
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Browse all categories
Every category on the codex, from study tools to ciphers — pick your starting point.
Browse → LivePrompt Simulator
Practice prompt engineering: write prompts, get scored 0–10.
Open tool → LiveGPA Calculator
Semester and cumulative GPA with weighted scales and a target planner.
Open tool →About these science
Every tool below is free, works in your browser, and needs no account.
- How does the equation balancer work?
- It sets up the atom-balance equations and solves the null space with exact fraction arithmetic — so H₂ + O₂ → H₂O correctly yields 2, 1, 2.
- Does the molecular weight tool know every element?
- Yes — all 118 elements with standard atomic weights, plus a per-element breakdown of your molecule.
- Are units handled?
- Each tool states its expected units up front and converts where it matters — no silent unit confusion.
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