SLA / LMA Converter
Choose the conversion direction and enter a value to instantly convert between specific leaf area SLA (cm²/g) and leaf mass per area LMA (g/m²) — reciprocals with area-unit conversion.
Input Data
Results
At a glance:Specific leaf area (SLA) and leaf mass per area (LMA) are a pair of core leaf traits in plant functional ecology describing leaf 'thinness and investment strategy', reciprocals of each other. SLA = leaf area ÷ leaf dry weight, measuring 'how much light-capturing area per unit dry weight', commonly cm²·g⁻¹; LMA = leaf dry weight ÷ leaf area, measuring 'how much dry matter invested per unit area', commonly g·m⁻². Because the area units differ (one cm², one m²), conversion must include 1 m² = 10000 cm²: LMA(g/m²) = 10000 ÷ SLA(cm²/g), and vice versa SLA(cm²/g) = 10000 ÷ LMA(g/m²). High SLA (= low LMA) means thin leaves, low construction cost, fast photosynthesis and growth — a 'quick-return' strategy; low SLA (= high LMA) means thick, drought/high-light tolerant, long-lived leaves — a 'durable-defense' strategy. Both are common in the literature; this tool eases switching between the two expressions.
Formula
From SLA to LMA: LMA(g/m²) = 10000 ÷ SLA(cm²/g).
From LMA to SLA: SLA(cm²/g) = 10000 ÷ LMA(g/m²).
Unit basis: 1 m² = 10000 cm², so their product is always 10000.
$$LMA_{(g/m^2)} = \frac{10000}{SLA_{(cm^2/g)}}$$$$SLA_{(cm^2/g)} = \frac{10000}{LMA_{(g/m^2)}}$$$$SLA_{(cm^2/g)} \times LMA_{(g/m^2)} = 10000$$How to Use
- Choose the direction: from SLA to LMA, or from LMA to SLA.
- Enter the corresponding source value (SLA in cm²/g, LMA in g/m²).
- The tool instantly computes the other trait; larger SLA means thinner leaves, larger LMA means thicker leaves.
Rough SLA vs LMA correspondence of common leaves
| Leaf type | SLA (cm²/g) | LMA (g/m²) |
|---|---|---|
| Fast-growing herb (thin) | ≈ 300 | ≈ 33 |
| Typical broadleaf tree | ≈ 150 | ≈ 67 |
| Evergreen sun leaf | ≈ 80 | ≈ 125 |
| Sclerophyll / needle (thick) | ≈ 40 | ≈ 250 |
SLA × LMA is always 10000; values are rough references varying with species, leaf age, and light.
Case Studies
Convert SLA to LMA
A thin herbaceous leaf measured SLA = 150 cm²/g; convert to LMA.
LMA = 10000 ÷ 150 ≈ 66.67 g/m².
66.67 g/m² is a moderate-low LMA, fitting thin, fast-growing resource strategy.
Convert LMA to SLA
An evergreen thick leaf measured LMA = 100 g/m²; convert to SLA.
SLA = 10000 ÷ 100 = 100 cm²/g.
SLA 100 cm²/g is lower than thin herbs, reflecting thicker leaves with more dry-matter investment per area.
FAQ
Why multiply by 10000 in the SLA/LMA conversion?
Because their customary area units differ: SLA uses cm²/g, LMA uses g/m². Since 1 m² = 10000 cm², converting g/cm² to g/m² multiplies by 10000, and taking the reciprocal gives LMA(g/m²) = 10000 ÷ SLA(cm²/g). If both used the same area unit (both m² or both cm²), they would be pure reciprocals without the 10000.
Which is more common, SLA or LMA?
Both are common, depending on research tradition. Early ecology and growth analysis favored SLA (emphasizing light-capture area), while the recent leaf economics spectrum literature and many databases prefer LMA (emphasizing structural investment). They are reciprocals and information-equivalent, so either is fine as long as you stay consistent within one study and state the unit.
What strategy does high SLA or high LMA represent?
High SLA (= low LMA) means thin leaves, low construction cost, fast photosynthesis and growth — common in resource-rich, shaded, or early-successional species, a 'quick-return' strategy; low SLA (= high LMA) means thick leaves with high defense and structural investment, longer-lived, more drought/high-light tolerant, a 'durable-defense' strategy. These are the two ends of the leaf economics spectrum.
Does conversion lose precision?
Pure mathematical conversion loses no information; SLA and LMA are one-to-one. Practical error comes mainly from measurement: leaf-area scan resolution, whether drying reached constant weight, balance precision, etc. As long as the source value is accurate, the converted result is accurate. Average several leaves and record sampling position and maturity for comparability.
Does the same species' SLA/LMA vary?
Yes. SLA/LMA varies with leaf age, position, and light: outer sunlit canopy leaves are thicker (lower SLA, higher LMA), inner shaded leaves thinner (higher SLA, lower LMA); older leaves are usually thicker than young ones. So when comparing plants or species, sample healthy leaves of the same position and maturity and note the environment.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.