How to use the nuclear reaction q-value calculator
Find the energy released or absorbed in a nuclear reaction from the atomic masses of reactants and products. Enter reactant 1 atomic mass, reactant 2 atomic mass, product 1 atomic mass, product 2 atomic mass in the fields above; the q-value, energy in joules are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “Q value”, “nuclear reaction energy”, “fusion energy released from masses”, “calculate nuclear reaction q-value”, “find q-value”.
Formula
Variables
- m1 — Reactant 1 atomic mass (u)
- m2 — Reactant 2 atomic mass (u)
- m3 — Product 1 atomic mass (u)
- m4 — Product 2 atomic mass (u)
Worked example
With reactant 1 atomic mass = 2.014102 u, reactant 2 atomic mass = 3.016049 u, product 1 atomic mass = 4.002602 u, product 2 atomic mass = 1.008665 u, the calculator gives q-value ≈ 17.59033 MeV; energy in joules ≈ 2.8183 × 10⁻¹² J.
Frequently asked questions
What is the nuclear reaction q-value calculator used for?
Find the energy released or absorbed in a nuclear reaction from the atomic masses of reactants and products. It helps with questions such as “Q value”, “nuclear reaction energy”, “fusion energy released from masses”.
What is the formula for the nuclear reaction q-value calculation?
Q-value (MeV) = (m1+m2-m3-m4) × 931.494. Energy in joules (J) = [Q-value] × QE × 1e6. Here m1 is reactant 1 atomic mass (u), m2 is reactant 2 atomic mass (u), m3 is product 1 atomic mass (u), m4 is product 2 atomic mass (u).
What inputs do I need for the nuclear reaction q-value calculator?
You need reactant 1 atomic mass in u, reactant 2 atomic mass in u, product 1 atomic mass in u, product 2 atomic mass in u. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the nuclear reaction q-value calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the nuclear reaction q-value result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.