Dollar cost averaging (DCA) in TNDM means investing a fixed amount at regular intervals, regardless of share price. This strategy reduces timing risk and builds wealth steadily through market ups and downs.
How This Calculator Works
Our DCA calculator simulates real market conditions using historical price data. It accounts for dividend reinvestment (DRIP), where each dividend payment automatically purchases additional shares. You can adjust the investment amount, frequency, time period, and compare against benchmarks like the S&P 500 and Nasdaq-100.
More TNDM Analysis
TNDM DCA Calculator
Dollar Cost Averaging — Tandem Diabetes Care, Inc.
Same amount invested each month — only the day of purchase changes. How much does intra-month timing actually matter?
Best Timing DCA
StrategyBuy on monthly low
Total Return-48.9%
Final Value$24.5K
Perfectly timed — impossible in practice
Your DCA
StrategyBuy on 1st of month
Total Return-54.7%
Final Value$21.7K
Consistent — no timing needed
Worst Timing DCA
StrategyBuy on monthly high
Total Return-58.7%
Final Value$19.8K
Worst possible — still beats not investing
Best vs Worst gap9.7 pp
Your timing vs best-5.8%
Your timing vs worst+3.9%
If You Keep Investing…
Based on this stock's historical CAGR of -11.7%/yr — put in vs. walk away with.
Your Plan
At $500/mo, this could grow into:
3 Years$18K~1.0x your moneyfrom $18K invested
5 Years$30K~1.0x your moneyfrom $30K invested
10 Years$60K~1.0x your moneyfrom $60K invested
20 Years$120K~1.0x your moneyfrom $120K invested
Compare Other Monthly Amounts
Same CAGR assumption. Use this to pressure-test different monthly commitments.
Monthly
3 Years~1.0x your money
5 Years~1.0x your money
10 Years~1.0x your money
20 Years~1.0x your money
$100/mo
$4K+$0 est. gain
$6K+$0 est. gain
$12K+$0 est. gain
$24K+$0 est. gain
$250/mo
$9K+$0 est. gain
$15K+$0 est. gain
$30K+$0 est. gain
$60K+$0 est. gain
$500/mo
$18K+$0 est. gain
$30K+$0 est. gain
$60K+$0 est. gain
$120K+$0 est. gain
$1,000/mo
$36K+$0 est. gain
$60K+$0 est. gain
$120K+$0 est. gain
$240K+$0 est. gain
* Projection assumes historical CAGR of -11.7% continues. Actual returns will vary.
Your DCA Results by Date
77 purchases
Date
Price
Invested
Portfolio Value
% Gain
Gain ($)
Jan 2, 2020
$60.21
$10,000
$10,000
+0.00%
$0
Feb 3, 2020
$75.90
$10,500
$13,106
+24.82%
$2,606
Mar 2, 2020
$78.76
$11,000
$14,100
+28.18%
$3,100
Apr 2, 2020
$64.27
$11,500
$12,006
+4.40%
$506
May 4, 2020
$82.13
$12,000
$15,842
+32.02%
$3,842
Jun 2, 2020
$82.35
$12,500
$16,384
+31.08%
$3,884
Jul 2, 2020
$98.58
$13,000
$20,114
+54.72%
$7,114
Aug 3, 2020
$105.41
$13,500
$22,007
+63.02%
$8,507
Sep 2, 2020
$115.35
$14,000
$24,582
+75.59%
$10,582
Oct 2, 2020
$111.05
$14,500
$24,166
+66.66%
$9,666
Nov 2, 2020
$108.00
$15,000
$24,002
+60.01%
$9,002
Dec 2, 2020
$94.38
$15,500
$21,475
+38.55%
$5,975
Jan 4, 2021
$93.49
$16,000
$21,773
+36.08%
$5,773
Feb 2, 2021
$94.59
$16,500
$22,529
+36.54%
$6,029
Mar 2, 2021
$93.54
$17,000
$22,779
+33.99%
$5,779
Apr 5, 2021
$86.06
$17,500
$21,457
+22.61%
$3,957
May 3, 2021
$92.09
$18,000
$23,461
+30.34%
$5,461
Jun 2, 2021
$86.00
$18,500
$22,409
+21.13%
$3,909
Jul 2, 2021
$98.61
$19,000
$26,195
+37.87%
$7,195
Aug 2, 2021
$106.62
$19,500
$28,823
+47.81%
$9,323
Sep 2, 2021
$113.49
$20,000
$31,180
+55.90%
$11,180
Oct 4, 2021
$118.18
$20,500
$32,969
+60.82%
$12,469
Nov 2, 2021
$139.29
$21,000
$39,358
+87.42%
$18,358
Dec 2, 2021
$127.57
$21,500
$36,546
+69.98%
$15,046
Jan 3, 2022
$150.09
$22,000
$43,498
+97.72%
$21,498
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Frequently Asked Questions
Common questions about DCA investing in TNDM
Investing $500 per month in Tandem Diabetes Care, Inc. (TNDM) over the past 6 years would be worth approximately $22K today. That's -54.7% total return on $48K invested, with a -11.7% compound annual growth rate (CAGR).