TRSTX vs. CULAX

Last updated Jun 4, 2026

TRSTX (T. Rowe Price Ultra Short-Term Bond Fund Class I) and CULAX (Calvert Ultra-Short Duration Income Fund) are both Ultrashort Bond funds. Over the past 5 years, TRSTX returned 3.55%/yr vs 3.38%/yr for CULAX. At a 0.33 correlation, their price movements are largely independent. TRSTX charges 0.20%/yr vs 0.72%/yr for CULAX.

Performance

TRSTX vs. CULAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Ultra Short-Term Bond Fund Class I (TRSTX) and Calvert Ultra-Short Duration Income Fund (CULAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TRSTX achieves a 1.64% return, which is significantly higher than CULAX's 1.34% return.

TRSTX

• 1D: 0.00%
• 1M: 0.37%
• YTD: 1.64%
• 6M: 2.04%
• 1Y: 4.70%
• 3Y*: 5.74%
• 5Y*: 3.55%
• 10Y*: —

CULAX

• 1D: 0.00%
• 1M: 0.31%
• YTD: 1.34%
• 6M: 1.77%
• 1Y: 4.21%
• 3Y*: 5.11%
• 5Y*: 3.38%
• 10Y*: 2.47%

*Multi-year figures are annualized to reflect compound growth (CAGR)

TRSTX vs. CULAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
TRSTX T. Rowe Price Ultra Short-Term Bond Fund Class I	1.64%	5.34%	6.41%	5.89%	-1.20%	0.29%	3.19%	3.65%	1.60%
CULAX Calvert Ultra-Short Duration Income Fund	1.34%	4.55%	5.69%	6.07%	-0.56%	0.43%	0.66%	3.30%	0.74%

Correlation

The correlation between TRSTX and CULAX is -0.06, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.06
Correlation (3Y) Calculated over the trailing 3-year period	0.27
Correlation (5Y) Calculated over the trailing 5-year period	0.30
Correlation (All Time) Calculated using the full available price history since May 1, 2018	0.33

The correlation between TRSTX and CULAX shifts across timeframes, from -0.06 (1 year) to 0.33 (all time), reflecting how their relationship changes across market environments.

Return for Risk

TRSTX vs. CULAX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

TRSTX

TRSTX Risk / Return Rank: 98
TRSTX Sharpe Ratio Rank: 92
TRSTX Sortino Ratio Rank: 99
TRSTX Omega Ratio Rank: 100
TRSTX Calmar Ratio Rank: 100
TRSTX Martin Ratio Rank: 99

CULAX

CULAX Risk / Return Rank: 98
CULAX Sharpe Ratio Rank: 94
CULAX Sortino Ratio Rank: 100
CULAX Omega Ratio Rank: 99
CULAX Calmar Ratio Rank: 99
CULAX Martin Ratio Rank: 99

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

TRSTX vs. CULAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Ultra Short-Term Bond Fund Class I (TRSTX) and Calvert Ultra-Short Duration Income Fund (CULAX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

	TRSTX	CULAX	Difference
Sharpe ratio: Return per unit of total volatility	3.15	3.22	-0.07
Sortino ratio: Return per unit of downside risk	9.73	11.38	-1.65
Omega ratio: Gain probability vs. loss probability	4.91	4.15	+0.76
Calmar ratio: Return relative to maximum drawdown	24.71	13.98	+10.73
Martin ratio: Return relative to average drawdown	55.77	56.95	-1.18
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TRSTX vs. CULAX - Sharpe Ratio Comparison

The current TRSTX Sharpe Ratio is 3.15, which is comparable to the CULAX Sharpe Ratio of 3.22. The chart below compares the historical Sharpe Ratios of TRSTX and CULAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	TRSTX	CULAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.15	3.22	-0.07
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	2.17	2.53	-0.36
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	1.75	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.03	2.07	-0.04

Drawdowns

TRSTX vs. CULAX - Drawdown Comparison

The maximum TRSTX drawdown since its inception was -4.34%, smaller than the maximum CULAX drawdown of -7.40%. Use the drawdown chart below to compare losses from any high point for TRSTX and CULAX.

Drawdown Indicators

	TRSTX	CULAX	Difference
Max Drawdown Largest peak-to-trough decline	-4.34%	-7.40%	+3.06%
Max Drawdown (1Y) Largest decline over 1 year	-0.20%	-0.30%	+0.10%
Max Drawdown (3Y) Largest decline over 3 years	-0.59%	-0.30%	-0.29%
Max Drawdown (5Y) Largest decline over 5 years	-2.58%	-2.19%	-0.39%
Max Drawdown (10Y) Largest decline over 10 years	—	-7.40%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.30%	-0.21%	-0.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.09%	0.07%	+0.02%

Volatility

TRSTX vs. CULAX - Volatility Comparison

T. Rowe Price Ultra Short-Term Bond Fund Class I (TRSTX) has a higher volatility of 0.37% compared to Calvert Ultra-Short Duration Income Fund (CULAX) at 0.31%. This indicates that TRSTX's price experiences larger fluctuations and is considered to be riskier than CULAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TRSTX	CULAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.37%	0.31%	+0.06%
Volatility (6M) Calculated over the trailing 6-month period	1.19%	0.84%	+0.35%
Volatility (1Y) Calculated over the trailing 1-year period	1.54%	1.32%	+0.22%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.66%	1.35%	+0.31%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.63%	1.42%	+0.21%

TRSTX vs. CULAX - Expense Ratio Comparison

TRSTX has a 0.20% expense ratio, which is lower than CULAX's 0.72% expense ratio.

Dividends

TRSTX vs. CULAX - Dividend Comparison

TRSTX's dividend yield for the trailing twelve months is around 4.59%, more than CULAX's 3.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CULAX Calvert Ultra-Short Duration Income Fund	3.91%	4.13%	4.90%	4.52%	1.47%	0.64%	1.25%	2.44%	2.10%	1.13%	1.10%	0.66%
TRSTX T. Rowe Price Ultra Short-Term Bond Fund Class I	4.59%	4.79%	5.19%	3.46%	1.61%	1.28%	1.94%	2.78%	1.98%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both TRSTX and CULAX in my portfolio?

TRSTX and CULAX have a correlation of -0.06, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TRSTX or CULAX?

TRSTX has higher volatility (0.37%) compared to CULAX (0.31%). In terms of maximum drawdown, TRSTX dropped -4.34% vs CULAX's -7.40%.

Which has better risk-adjusted returns?

CULAX currently has the higher Sharpe Ratio (3.22 vs 3.15), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.