100
cm²/g
10
m²/kg
0.01
g/cm²
100
cm²/g
10
m²/kg
0.01
g/cm²
The Specific Leaf Area (SLA) Calculator computes the ratio of leaf area to leaf dry mass, one of the most widely used functional traits in plant ecology. SLA reflects the trade-off between resource capture (high SLA = thin, cheap leaves with large area) and resource conservation (low SLA = thick, durable leaves with high investment per area). It is a key component of the leaf economics spectrum and is correlated with photosynthetic capacity, leaf lifespan, nutrient content, and growth strategy.
Enter the one-sided leaf area (cm²) and leaf dry mass (g) to obtain SLA, its metric equivalent (m²/kg), and the inverse trait LMA (Leaf Mass per Area).
The calculator applies straightforward ratios:
Leaf area is the one-sided projected area, typically measured with a leaf area meter, scanner, or image analysis software. Dry mass is obtained after oven-drying leaves at 60-70 degrees Celsius for 48-72 hours until constant weight. Both measurements should be taken on the same leaf or batch of leaves.
Inputs
Results
A thin, fast-growing herb leaf with 50 cm² area and only 0.2 g dry mass has a high SLA of 250 cm²/g.
Inputs
Results
A thick, long-lived evergreen leaf with 30 cm² and 0.6 g has a low SLA of 50 cm²/g, indicating high investment per area.
High SLA (above 200 cm²/g) indicates thin, lightweight leaves with large surface area per unit of dry mass investment. These leaves are typical of fast-growing species in resource-rich environments. They have high photosynthetic rates, high nitrogen content per area, and short lifespans. This strategy maximizes carbon capture but leaves are vulnerable to herbivory, drought, and physical damage.
The leaf economics spectrum is a universal pattern across plant species showing that leaf traits are correlated along a single axis from "fast-return" strategies (high SLA, high photosynthesis, short leaf lifespan, high nutrient content) to "slow-return" strategies (low SLA, low photosynthesis, long leaf lifespan, low nutrient content). SLA is one of the best single predictors of where a species falls on this spectrum.
Collect fully expanded, sun-exposed leaves (unless studying shade leaves specifically). Measure one-sided projected leaf area using a leaf area meter or image analysis before drying. Dry leaves at 60-70 degrees Celsius for at least 48 hours until weight is constant. Weigh to the nearest 0.001 g. Calculate SLA for individual leaves or average across multiple leaves per plant.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
How helpful was this calculator?
Be the first to rate!
