How to Increase and Decrease Stitches Evenly in Knitting and Crochet

Your pattern says: "Increase evenly to 104." You have 92 stitches on your needle. Twelve increases hide inside that small sentence—twelve decisions about where each one goes, spaced so the fabric doesn't pucker or slant. This guide shows you how to think through those decisions, what to do when the math doesn't divide cleanly, and when to hand the exact spacing to a calculator.

The Core Idea: Intervals, Not Guesswork

Even distribution means spacing your changes at regular intervals across the entire row or round. The interval is the number of plain stitches between changes.

Basic formula:

• Increases: Interval = Current stitches ÷ Number of increases
• Decreases: Interval = Current stitches ÷ Number of decreases

When this division results in a whole number, placement is straightforward. When it doesn't, you get a remainder—and that remainder is where most mistakes happen.

Worked Example: Increasing 92 to 104 Stitches

The numbers:

• Current: 92 stitches
• Target: 104 stitches
• Total increases needed: 104 − 92 = 12 increases

Calculate the interval: 92 ÷ 12 = 7.666...

This is not a whole number. You cannot place an increase every 7.666 stitches. You must work with whole stitches, which means some intervals will be 7 stitches and some will be 8.

Distribute the remainder:

• 12 × 7 = 84 (uses 84 of your 92 stitches)
• Remainder: 92 − 84 = 8 stitches

Those 8 extra stitches get distributed as +1 to 8 of your 12 intervals. So:

• 8 intervals of 8 stitches (then increase)
• 4 intervals of 7 stitches (then increase)

Practical placement: Work 8, increase, 8, increase, 8, increase, 8, increase, 7, increase, 7, increase, 7, increase, 7, increase—continuing around until all 12 increases are placed. The order of 7s and 8s can be varied; what matters is that no two increases end up clustered.

Worked Example: Decreasing 104 to 92 Stitches

The numbers:

• Current: 104 stitches
• Target: 92 stitches
• Total decreases needed: 104 − 92 = 12 decreases

Calculate the interval: 104 ÷ 12 = 8.666...

Again, a remainder. Working with whole stitches:

• 12 × 8 = 96 (uses 96 of your 104 stitches)
• Remainder: 104 − 96 = 8 stitches

Distribution:

• 8 intervals of 9 stitches (then work 2 together, or your chosen decrease)
• 4 intervals of 8 stitches (then decrease)

Understanding Remainders

Situation — What It Means — What You Do

No remainder (e.g., 90 ÷ 10 = 9) — Perfect interval — Place change every X stitches exactly

Small remainder (1–3) — Slight unevenness — Add 1 extra stitch to first few intervals

Large remainder (close to divisor) — Many intervals need +1 — Spread extra stitches across many intervals; consider checking your math

Remainder > half the divisor — Re-examine — Some methods prefer alternating; ensure you're not creating visible bias

The key principle: never hide all remainder stitches at one end. That creates a visible bulge or dip. Spread them throughout.

Edge Stitches: Where to Start

Patterns vary in edge treatment. Three common conventions exist:

1. First change at the very beginning: Start with increase/decrease, then interval. Creates symmetrical edges but can feel abrupt.
2. Half-interval at each edge: Begin with half your interval, work change, continue, end with half interval. Popular in garment shaping for cleaner seams.
3. Full interval before first change: Begin with complete interval, then change. Simplest to execute but may offset pattern alignment.

No single convention is universal. Check your pattern's context: garment pieces seamed together often use method 2; circular shawls may use method 1; stitch-pattern compatibility may dictate method 3.

Knitting vs. Crochet: Practical Notes

Knitting:

• Increases: kfb (knit front and back), M1L/M1R (make one left/right), yarn over (if lace). Each consumes or creates space differently.
• Decreases: k2tog (right-leaning), ssk (left-leaning), or paired decreases for symmetry.
• Critical detail: A kfb uses an existing stitch; an M1 uses the bar between stitches. This affects your stitch count timing. Work the increase after your interval stitches, not within them.

Crochet:

• Increases: Two stitches in one stitch. Straightforward count-wise.
• Decreases: Yarn over, pull through (various forms), or invisible decrease for amigurumi.
• Critical detail: Crochet row ends can be ambiguous—is your turning chain a stitch? Patterns disagree. Verify whether your interval count includes or excludes the chain before calculating.

Common Mistakes

• Forgetting that increases/decreases consume or add stitches: An increase worked in a stitch doesn't add to your interval count; an increase between stitches does. Know which type your pattern implies.
• Rounding all intervals the same direction: 7.6 becomes 7 or 8, but not all 8s. Distribute honestly.
• Ignoring the final interval: After your last change, you must still have stitches to work to the end. Count your total before and after placing changes.
• Clustering remainders: Putting three extra stitches at the beginning and none elsewhere creates visible shaping.
• Mixing increase types without adjusting: A yarn-over increase is decorative and smaller than a kfb; substituting changes your fabric density.

When the Math Gets Tedious

For simple numbers, mental math works. For complex garment shaping—multiple sizes, compound curves, or pattern-stitch constraints—exact distribution matters more. TheIncrease / Decrease Evenly Calculatorhandles any stitch counts, returns placement sequences, and accounts for your chosen edge treatment.

If you're resizing a pattern entirely, thePattern Resize Calculatormay also help establish your new target counts before you distribute changes.

Limitations and Assumptions

• This method assumes even distribution across a straight row or round. Tapered shapes (raglans, set-in sleeves) use different shaping curves.
• It assumes all increases/decreases are identical. Mixed shaping (e.g., some kfb, some M1) changes fabric texture and may need manual adjustment.
• Stitch pattern compatibility is not addressed here—cables, lace, or colorwork may constrain where changes can occur.
• The worked examples use closed-ring or flat-row logic; three-dimensional shaping (toe-up socks, crown decreases) sometimes uses radial math instead.

Your Next Step

Pick a real pattern instruction. Write down your current count, target count, and the difference. Do the division. Note your remainder. Sketch the interval sequence on paper before touching yarn. If the numbers are clean, proceed with confidence. If they're messy, you now understand what the calculator is doing—and why.