42 free tools across chemistry, physics, maths and accounts. Each has its own page and opens straight into the calculator.
k = A·e^(−Ea/RT). Leave one blank.
Simple +, −, ×, ÷ — for everyday calculations.
Leave one field blank.
pH = pKa + log([A⁻]/[HA])
Leave either P₂ or ΔH vap blank.
Leave exactly one blank (T in Kelvin).
Molarity, moles, mass — fill any two.
Leave the unknown blank.
Eq. wt = Molar mass / n-factor
Computes F, KE, PE and W from whichever pairs you provide (g = 9.80665).
r₁/r₂ = √(M₂/M₁) — molar mass ya formula.
Leave the unknown blank. R = 0.08206 L·atm/mol·K.
New Regime — FY 2025-26 (AY 2026-27) slabs, §87A rebate & marginal relief ke saath.
Salt A x B y — enter either Ksp or s.
Enter any 3 values, leave the rest blank — the rest are solved.
Formula + (mass ya moles) — doosra nikal jayega.
Rows me numbers space se, rows new line se.
de Broglie: enter m and v. Photon: enter λ only.
E = E° − (0.0592/n)·log Q (298 K)
Enter any 2 of V, I and R.
Enter values with sign convention; leave one blank.
Formula + element → oxidation state. (Standard rules; peroxide/hydride exceptions differ.)
Coefficients, highest power first. x³−6x²+11x−6 → 1,-6,11,-6
Leave one field blank. N = N₀(½)^(t/t½)
Tap a value to copy. CODATA / standard.
Leave either K₂ or ΔH° blank.
Enter any 2. Use the c button for light.
Enter one value; the rest are derived (25 °C).