Military High-3 Calculator: Estimate Retired Pay From Base Pay
Use this guide to understand the assumptions, inputs, results, and next steps behind the calculator.
Created by Luis Gonzalez · Last updated May 9, 2026
High-3 is a military retirement calculation method that uses the average of a member’s highest 36 months of basic pay and a service-based multiplier. This calculator projects future pay from current monthly base pay and an annual raise assumption, estimates a High-3 average, and applies a service multiplier to estimate monthly retired pay.
The default estimate projects $4,137 monthly retired pay from an estimated High-3 average of $8,273 and a 50% multiplier. It also projects $3,346,132 in lifetime pension income under the entered COLA and lifespan assumptions. Those are planning estimates, not an official military pay computation. For a broader comparison, see the Military Retirement Calculator.
Enter Pay, Service, and Retirement Timing
Enter current monthly base pay, projected annual raises, years until retirement, and years of service at retirement. The calculator projects one base-pay amount for each year from now through the retirement year, selects the three highest projected annual amounts, and averages them. That is a simplified estimate: the actual High-36 calculation uses the member’s highest 36 months of basic pay, not three annual snapshots.
The default inputs are $6,500 monthly current base pay, 3.5% annual raises, eight years until retirement, and 20 years of service at retirement. The calculator projects nine annual pay points, from year 0 through year 8. The three highest projected amounts are approximately $8,000, $8,279, and $8,569 before the component’s rounding and selection details; the displayed High-3 average is $8,273. The pay-at-retirement result is $8,559.
The multiplier is 2.5% per year of service, capped at 75% in this model. At 20 years, 20 × 2.5% = 50%. Therefore, $8,273 × 50% = $4,136.50, rounded to $4,137 monthly. Annual retired pay is $4,137 × 12 = $49,644.
What High-3 Represents
The High-36 average is based on basic pay, not total compensation. Allowances such as Basic Allowance for Housing and Basic Allowance for Subsistence generally are not part of the basic-pay amount used in this pension formula. The Defense Finance and Accounting Service retired-pay resources provide official information on estimating military retired pay.
The calculator’s projection is not a pay-table forecast. It compounds the current base pay by the same annual raise percentage each year. Actual pay changes can differ by rank, time in service, statutory pay adjustments, promotion timing, and other factors. For a more detailed military retirement estimate, compare the Military High-3 Calculator, Military Retirement Pay Calculator, and Military Pension Calculator.
The multiplier also depends on retirement system. This page estimates a High-3-style 2.5% multiplier. The Blended Retirement System (BRS) generally uses a 2.0% multiplier per year of service, paired with TSP contributions and matching. A High-3 estimate should not be treated as the right formula for every member. Review the Blended Retirement System Calculator if BRS applies to you.
| Service at retirement | High-3 average held constant | Multiplier | Estimated monthly retired pay |
|---|---|---|---|
| 20 years | $8,273 | 50% | $4,137 |
| 24 years | $8,273 | 60% | $4,964 |
| 30 years | $8,273 | 75% cap | $6,205 |
This table changes only years of service and holds the estimated pay average constant. The 30-year result reflects the model’s 75% cap. An actual retirement estimate should use the appropriate pay tables and service history.
COLA, Lifetime Income, and the Limits of Projection
The calculator increases annual retired pay by the entered COLA rate. With a 2.5% COLA, the annual pension rises over time in nominal dollars. It assumes the same COLA every year; actual adjustments vary. The default lifespan projection spans 40 retirement years, from retirement at age 42 through the year the member reaches age 81.
The lifetime income result of $3,346,132 sums projected pension payments with a 2.5% annual COLA. It is not a present value: future dollars are added without discounting them to today’s value. Nor does it account for taxes, survivor coverage, health costs, or the possibility that actual lifespan differs from the input. For a present-value estimate, use the Pension Present Value Calculator.
The calculator’s replacement rate compares its annual pension with projected base pay at retirement. The default replacement rate is 48%: $49,644 ÷ $8,559 ÷ 12? No—the comparison is monthly pension divided by monthly projected pay: $4,137 ÷ $8,559 = 48% after rounding. This is not a replacement rate for total military compensation or household spending. Explore the Pension Income Calculator and a broader retirement needs estimate.
Formula and Default Calculation
The model projects annual base pay with compound growth, averages its three highest projected annual values, and multiplies that average by the service multiplier.
Projected base pay in year n = current monthly base pay × (1 + annual raise rate)^n
Estimated High-3 average = average of the three highest projected annual base-pay values
Service multiplier = lesser of (years of service × 2.5%) or 75%
Monthly retired pay = estimated High-3 average × service multiplier
Lifetime income = sum of annual retired pay × (1 + COLA rate)^year
For the default inputs, the calculator returns a High-3 average of $8,273. The multiplier is 20 × 2.5% = 50%. Then $8,273 × 0.50 = $4,136.50, which rounds to $4,137 per month. Annual pay is $4,137 × 12 = $49,644. The projected final year’s monthly base pay is $8,559, and the calculator estimates lifetime income of $3,346,132 across 40 years.
High-3 Questions
Does High-3 mean the average of my three highest annual salaries?
Not exactly. High-36 uses the highest 36 months of basic pay. This calculator approximates that result using projected annual pay points, so promotion timing and monthly pay changes may produce a different official average.
Does the estimate include housing allowance or special pays?
No. It projects monthly basic pay. Allowances and many special pays are not basic pay used in the standard retired-pay formula. Verify the pay elements relevant to your record with official military retirement resources.
Is the High-3 multiplier always 2.5% per year?
No. It applies to the legacy High-3 calculation represented here. BRS generally uses a 2.0% multiplier per year, while other system-specific rules may apply. Compare with the Military Redux Retirement Calculator and Military Retirement Calculator.
Why is the multiplier capped at 75%?
The calculator caps its multiplier at 75%. The cap means additional service beyond the point where the cap is reached does not increase this modeled percentage. Check the retirement system and applicable rules that govern your service.
Should I trust the lifetime income total as a lump sum today?
No. Lifetime income adds projected future payments in nominal dollars; it does not discount them to present value. A pension’s present value also depends on discount rate, inflation, COLA assumptions, and payment timing.
Should I use a higher pay-raise assumption or a lower one?
A higher raise assumption increases projected pay and potentially the estimated High-3 average, but actual raises and promotions are uncertain. Test a conservative and an optimistic rate rather than treating one projection as a promise.
Does this tell me whether I can afford to retire?
No. It estimates a pension, not household income needs, taxes, healthcare, savings withdrawals, or survivor needs. Pair it with a retirement goal estimate and a retirement withdrawal estimate.
Next Steps for Your Retirement Estimate
Start by checking the retirement system that applies to your service and confirming your projected basic-pay history. Then compare the result with the Military Retirement Pay Calculator, the Military Redux Retirement Calculator, and the FERS High-3 Calculator if you also have federal civilian service.
For the rest of the plan, estimate TSP or other investment withdrawals with the Retirement Withdrawal Calculator and Tax-Efficient Retirement Withdrawal Calculator. Consider how inflation affects future spending, and review required minimum distribution rules for tax-deferred accounts. Use official records and pay tables to replace assumptions before making a retirement decision.