Percent Yield Calculator
Percent yield = (actual / theoretical) × 100. Quantifies reaction efficiency.
Result
Percent yield
85.00%
Good
- Actual8.5
- Theoretical10
- Ratio0.8500
- Lost (%)15.00%
Step-by-step
- Yield = (8.5 / 10) × 100 = 85.00%.
How to use this calculator
- Enter both yields in matching units.
- Read percent yield.
About this calculator
Reactions don't always give 100% of the theoretical product — some is lost to side reactions, transfers, evaporation, or incomplete conversion. Percent yield = (actual product / theoretical product) × 100. Below 50% suggests a problem; above 100% means measurement error or contamination.
Frequently asked
Mathematically yes if there's contamination, residual solvent, or weighing error. A "yield" >100% is a red flag for cleanup or measurement issues.
Related calculators
Theoretical Yield Calculator
Compute theoretical yield (g) from moles of limiting reactant, stoichiometric ratio, and product molar mass.
Limiting Reactant Calculator
For a reaction with two reactants A and B in ratio a:b, find which one runs out first.
Molarity Calculator
M = moles solute / liters solution. The most common solution-concentration unit in chemistry.
Molar Mass Calculator
Compute molar mass from a chemical formula. Supports common elements; multi-character symbols and subscripts.
Mole ↔ Gram Conversion
Convert between moles and grams using molar mass.
Force Calculator (F = m·a)
Newton's second law: enter mass and acceleration, get force in newtons. Step-by-step working and pound-force conversion shown.